09 5.7 with 185,000 miles and experienced a misfire on my #1 cylinder. Replaced the coil pack still a misfire, replaced plugs, misfire. Swapped injector and all good.
@@jiovanysanchez6787 that .ames since. Before I decided to go with a different engine I was going to go with rebuilt heads, cam, lifters, plug the mds solinodes and tune the mds out. Glad its working for you.
I like to see how high the spark KV is to see if a cylinder may have low compression which may be due to low intake vacuum, your patterns go off the top of the screen. Thanks for the great case study.
I would think that low compression would lower the spark KV in that cylinder but I never actually looked at that on this system. Interesting thought though trouble is there are other factors that can change the KV so I'm not sure if that would be conclusive or not. Thanks for watching.
Fast forward to 14:45 for the problem. You likely have the same issue. Flat Cam lobe. Pull the valve cover off to watch the valve movement. You have pretty much done everything else. Good luck.
I took my 2010 to mechanic shop knowing the problem already. They ran diagnosis and got back with me and told me that they refuse to work on the motor that the only option I have is to pay $15k for a new motor swap. (Needs new Cam and lifter) 😂 needless to say I drove it back home and will continue driving it locally here and there. As I have done for the past 4 years.
Most shops won't recommend internal engine repairs as its too expensive with lots of liability. Even the engine rebuilders hardly want to work on them. Maybe try find a used low mileage engine. A newer model engine, up to 2020 will work with some parts swapped
@PhillipBailey I now drive only with MDS cut off. And have turned off my one bad cylinder. So effectively for 2months my V7 Ram has ran better than it has in years.😂 I'm poor. I'll just bury the 220k mileage truck when the motor or transmission sees its last day. For now tho, it's running smoother than ever🤷♂️
It appears to be a common problem. If the computer is flagging a specific cylinder then I'd recommend to swap the coil, swap or replace plugs and if the miss is still on the same cylinder pull valve cover and look at rocker arm travel. Normally a valve problem shows up on the vacuum gage needle but this one didn't for some reason. Good luck
2015 ram v8 5.7 I replaced the cam and lifters now the truck runs way more rough than it did. The CEL is flashing when previously it was only constantly on. Bad mechanic? Rpm is constantly high. Dont know what else to fix. Seems like it got worse than before i replaced the cams and lifters. Any suggestions?
Well you have to start over again. Figure out what cylinder is misfiring on. Check spark, fuel and mechanical, did you have the heads reconditioned when off? Timing chain time correctly? Did you use stock parts?
I have 2012 ram 1500 5.7 i had misfire cylinder 1 changed sparked plugs made sure they were good still had code put the coil pack on the cylinder 1 that apparently misfire but still have code..truck vibrates as a accelrate but not when i coast i came down to maybe fuel injectors any advice?
If its consistent misfire on cylinder 1 it could be poor fuel delivery from that injector. Change or swap the injector or pull the valve cover off and watch valve movement.
I have a 2011 ram 1500 hemi. Truck starts and runs normal until I get on it Then when I do CEL starts flashing but only for a few seconds. Obviously stating a misfire.. I have changed the oil, all 16 plugs and all 8 coils. Pulling codes states p 0303 which is a cylinder 3 misfire. And it still has the same issue, next most common diagnosis?
Check injector flow compare number 3 to the others, swap injector 3 to a different cylinder if still number 3 remove valve cover and observe valve operation comparing movement of number 3 valves to other cylinders. Good luck
12 Ram 1500 5/7 Laramie drove Texas to Cali I got to San Diego the engine light started flashing under acceleration got a scan cylinder 3 misfire did a tune-up did nothing got 8 miles to gallon all the way back symptom was blown motor metal shavings
I have a 2013 Dodge Charger 5.7. Recently experienced missfire on whole drivers side bank. 1,3,5,7. I have tested injectors , replaced all coils and plugs. Some plugs smelled like gas but not covered in oil or anything.. I have a bi-directional scanner. But I’m lost I have been reading alot of comments and watching videos. I replaced 1,3 injectors with new and no change. Car sounds like a Chevy 😂 misfires at idling soon as you start it up. I hope you still check these comments Thankyou !
It sounds like you have a restricted converter on that bank. The other possibility is a skewed O2 sensor on that bank. Have a look at the short and long term fuel trims. Should be no more than +/- 10%. Try unplugging the forward O2 on bank one. If its still showing misfires try removing the forward O2 and see if the misfires are eliminated. Is so check exhaust backpressure.
Here is an example on an F150 where it was misfiring on all cylinders on one bank. Fast forward to 10.30 in the video for a demo of back pressure testing. th-cam.com/video/gswxFMTBqU8/w-d-xo.html
@@PhillipBailey thanks 😊 for replying. I have long tube headers on this motor with no cats . But I do have 02 sensor codes as well with the p0300, I have p0032. O2S21 is at 0.820V the others are at 1.270V.
@@bignaj3992 if its in closed loop the two forward O2 sensors should be switching between 0.1 and 0.9volts. Typically over 0.45 volt would be rich. Try unplugging the forward O2 sensors. So you don't have rear sensors or you do but just no cats. Are you running a tune to deal with that?
@@PhillipBailey I don’t have an official tune for it , but I’ve been driving it like this perfecting with no problem for a while now up until about 2 days ago. The only mod I needed that I knew of was 02 extender harness to stretch and reach the sensors for the long tube application. The headers came with the open whole to screw in original 02 sensor but I will try to unplug it. I know my scanner will show me what I need to see it’s just hard reading that data . I was able to find the WHICH Cylinder is misfiring. Also injector pulse was at 0 for those specific bank cylinders
Great video, I’m dealing with this now. I replaced plugs, a couple coils, was going to take off the valve cover but decided to do a compression test first and I got 190-200 lbs on all cylinders. Can I rule out valve train?
No a compression test definitely will not rule out valve train as at cranking speeds there is lots of time for the engine to breath. Have to remove the cover and watch the valves move. Hood luck
Phillip Bailey you’re correct. I’m still in shock after doing exactly what you just said a couple days ago. #3&5 barely moved when we cranked it over. We were hoping to find broken valve springs but no dice. Thanks for the reply though.
When u checked for ignition wave forms, I wonder if u noticed the hashing on the No.5 waveform compared to No.1m, If it is related to the misfire, Also wondered why u didn't do a snap throttle test which would help further diagnosing the ignition event. Regardless very informational video, Thank you very much.
Thanks for pointing that out. You're correct the burn line was quite hashed compared to the other cylinder which would indicate greater turbulence during the burn event. I dont think I would have been able to make a call based on that though. Thanks for watching.
I now have a first look sensor which I'm sure would have detected a vacuum anomaly that might have helped pinpoint the mechanical valve issue. I was surprised the vacuum gage did not show a fluctuations when it was running. That threw me off a bit...
I have a 2010 ram 5.7, with what started as a p303 an now a p300. Compression was good on the 6 cylinders I haven’t gotten to the last 2 in the back. So far I have replaced: -Alternator -16 spark plugs -fuel pump -cam sensor -knock sensor -crank sensor -Thermostat -two new coils on cylinders 3 & 5 -two new injectors on cylinder 3 & 5 And I still have a misfire. I don’t want to keep throwing money at it any suggestions?
Wow James, I know your pain, I have the same codes, with good compression too. I’ve replaced some of the same components you have, but no luck. I’m thinking it’s fuel injectors but I’m ready to let a shop take over. What going on with your truck??
Wade Taylor well now I found out the air intake sensor had no current to it so I changed it and also the throttle body, still a misfire. Runs a tad better but it’s definitely a pain in the ass!
James Taylor I recently yanked the fuel rail with the injectors and they were absolutely filthy, cleaned them up and still no dice. So I officially give up and taking it in tomorrow. I’ll let you know what happens!
Wade Taylor do you think if the exhaust is loose that it can cause the misfire? I just put a quart of MMO in the crank case and, STP 5in1 in the tank I still hear the tick but it drives the same just downshifts a tad quicker. Next I’ll check the fuel pressure regulator and the top two oxygen sensors an see what I get!!!!
James Taylor for sure if your exhaust connection at the catalytic converter is lose you will get a misfire. I dropped mine off at a reputable shop. $140 for an hour of diagnostic. I think it’s worth it. I’m beat down! I’ll let you know what they tell me
Great video!!! Having some of the same problems in a 2013 Grand Cherokee 5.7 Laredo; just started having the misfire issues….probably will just ride it till it dies rather than drop 12k for a new engine….any idea how much life I might get out of it still? Has 128k miles
There are other causes of misfire like plugs, coils and injectors. Driving for extended time with a misfire will damage the converter. You should at least eliminate the cheaper fixes. If it is a cam or lifter failure it does not usually blow up in my opinion. It's impossible to say how long. This truck had the miss for around 6 months.
@@PhillipBailey thanks!!!! I have had it in the shop for 3 days and they eliminated plugs (new OEM) and coils being the issue and had #5 cylinder PSI at around 200 since the exhaust valve won’t open properly; no other cylinders are misfiring; if there is metal in the engine, are there any oil treatments/flushes that I can do to help get that stuff into the pan for it o be removed and try to get as much out of it as I can?
Available from a few places. These ones are good cause they have a jumper wire you can put an amp clamp over to test current flow. rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F401434937955
Hi ibjust got a 14 ram withbthe 5.7l the light flashes at idle Nd in drive it has no problem but if it idle long enough at a stop light or something like that Nd it will run crPpy and cel will flash and eco light comes on then it clears up like no problem and cel stays solid and runs great and no eco light
The injector should have power from the ASD relay while running on one wire and is switched in the ground by the pcm. If you're testing for power with just the key in run power will be turned off after two seconds. Compare testing on a know good injector
@ginocrisano4804 usually that should set an injector driver code. I'd try unplugging the injector and see if it sets that code instead of the misfire code. The other logical explanation is the pcm is purposely shutting off the injector as part of its failsafe strategy to protect the converter. I'd connect a noid light on the injector, clear all codes then start the engine to see if the injector works until it sets the misfire code.
My truck is throwing a cylinder 5 misfire. When I pass speeds of 30 my engine light flashes and the truck will shake at a stop. If I go just over 40, my engine light will flash again but runs smooth after that. Any possible diagnosis?
Well the flashing MIL indicates there is a significant misfire potentially damaging the catalyst. If its setting a P0305 then try moving the number 5 coil to a different location. could be sparkplug/s, coil, injector or mechanical. Swapping parts is easy to do and if the problem follows the coil then replace it. You will need to clear the code after moving parts around. You will need additional test equipment if the coil or plugs are not the problem. HTH good luck
@@PhillipBailey Thank you for the advice! Sadly it wasn't the coil or the plugs so have to take it to get diagnosed. Hopefully its something that won't cost much haha
Yes most of the time it will since at cranking speeds during the compression test you have lots of time for air to enter and or exit the cylinder. A running compression test using a pressure tranducer and a labscope should show it though.
My daughter's 2009 police persuit Charger has a miss in cylinder's 1 and 2, mostly under load. I replaced all of the coil packs and spark plugs and that did not solve the problem. What should I do next? Anyone have any ideas?
Since you have replaced the ignition components and nothing has changed that leaves fuel injectors and mechanical. An injector flow test might show a difference between cylinders or swapping the injectors between cylinders. Then there's valvetrain operation. Remove a valvecover and watch valve movement. Could be a flat cam lobe.
Compression test will not catch a flat or worn cam lobe. There is plenty of time to get air into and out of the cylinder at cranking speed. Make sure the injector is delivering fuel. A flow test would be in order but if you don't have that equipment pull the valve cover and watch the valve movement while cranking. Hope this helps.
I'm getting P0304 (cylinder 4 misfire) and p1414 (Secondary Air Injection System Monitor circuit High Voltage). Any idea what the cause might be? I've tried swapping the coil and the spark plugs.
A misfire can be caused by a number of things. Sparkplug, coil, injector not delivering proper fuel and internal engine problems like low compression, improper valve operation as this one had. Pretty common for lifter failures on these engines. P1414 is probably related to the P0304 and is a problem with the solenoid that controls the MSD lifters on number 4. Not an air pump code and unless you are in California I doubt the truck has an air pump. Research the P1414 problem. HTH
@@PhillipBailey I'm having a similar issue, Firestone diagnosed it as a low compression in cylinder 3, but the issue goes away. I just drove it for 2 straight days and the check engine light went off. Then came back on today along with the vibration. If it's low compression wouldn't it misfire ALL the time?
@@BryanIrvine yes I agree a low compression problem caused by valves not sealing or piston ring problems should be very consistent. A collapsed lifter could come and go though if the lifter pumps up again. What have you done to attempt to fix it already?
@@PhillipBailey so far all I’ve done is ignition tune. It’s been inconsistent enough that I thought maybe it was a coil pack. When it the vibration got more consistent I took it in for diagnosis. I used to be able to make the vibration and check engine light go away just by turning it off and on again at a light. Some days it’s barely drivable. Then sometimes it’ll go two days acting like nothing is wrong at all. I’ve tried driving it in tow/haul to see if maybe it’s related to the MDS but that made no difference. I’m starting to lean towards goofy lifter/cam issue. Maybe it tested as low compression because a valve isn’t closing? 🤔
6.1 challenger..started with o2 sensor codes. Replaced. Then p0300 and p0303. Obd2 showed misfires on cylinder 3 & 8 Replaced plug and coil. Then got o2 code again for fuel being too lean. Switched o2 sensors around and now I'm getting misfire diagnosis on cylinder 3 and 6 but without a code.??
@@mikeprice8307 bluedriver should be able to display the short term and long term fuel trims on bank 1 and 2. If they are greater than 10% plus or minus it indicates a problem. Plus trims suggest the engine is running lean due to things like low fuel pressure or an induction leak. Negative trims suggest the engine is running rich possibly high fuel pressure. If one side is affected more than the other you have a problem on that bank. You might have a restricted catalytic converter as well good luck
if the rocker arm doesn't move like the others the camshaft lobe is worn off. Requires cylinder heads removed and front of engine disassembled to remove the cam and lifters. Not a cheap job.
@Voorhees666Drummer thats a tough call. My customer opted to replsce the engine assembly with a reman. They did the job themselves. My guess to repair the engine would be around $5500.00 CAN. . So much depends on what else you do while in there. You have to remove the heads for instance so do you have them rebuilt while they are off? Do you replace all the lifters or just tge failed ones, new water pump? Do you remove the engine completely or just the heads in the vehicle. I'd recommend engine removal as its much easier to work on once out.
@@pineappleexpressnetwork4942 well to do a cam and lifters tge heads have to be removed so it's pretty intensive work. You have to consider the overall condition of the truck and value before and after. Even a used engine is an option but not a good one in my opinion. (You have a used one now). Good luck.
Could this cause a misfire on two cylinders that are across from each other? I have one that has 5 and 6 misfire. Swapped coils and no change. Will do plugs on Monday and see if there's a change. #6 piston is wet, #5 is dry if that's relevant. Thanks
Usually it only affects one cylinder and it appears to be most common for number 5 to fail. That being said it could also be a bad coil or injector. Have to eliminate one at a time. Good luck
@@PhillipBailey so I don't think I cleared the codes after swapping the coils. Would it still read a misfire on the original cylinder even though the coils been swapped?
@@SJJ1776 if your watching misfire data on a scan tool it should stop missing if the coil was the problem. If your just reading codes then yes you need to clear them then reroad test and rescan.
Misfire p0301 zero issues runs fine tons of power like normal idles smooth bought it used sat for a year what do you think? I'm going to put in new plugs and swap the coil pack to cylinder 2 to see if it moves over hopefully it's just the coilpack
The misfire algorithm is pretty sensitive on these. It may feel smooth to you but computer is seeing something. Yes plugs and swap coil for sure. Say a prayer if you're religious. Good luck
@@PhillipBailey changed the two spark plugs in cylinder 1 for code p0301. Code has went away not seeing any misfire codes. I disconnected all my cat sensors though the truck was acting up when they were on. Been sitting for over a year I guess they gone bad gonna need to change them all. Has 4 o2 sensors
Hello Mr.Bailey, I have been having an issue with my 2012 ram 1500 5.7 4wd. I have a video posted on TH-cam. "2012 dodge ram 5.7 4wd no start please help" Cranks but doesn't start. Code p0308. New spark plugs were replaced 8mo ago. I swapped the 8th coil. New battery installed. Still no start. I cleaned just about ever electrical connector under the hood, including under the fuse box. It will turn over if I do not start the truck over extended period of time.. Please please help me if possible
Thanks for a GREAT video. My nephew spent $4500 to get his cam and lifters replaced on his 5.7 at the dealer where he is a salesman, four months ago. Now it is missing real bad, so I told him to bring it to me and I would put my scanner on it and check it out. I'm 71 and retired and have never had a vehicle in a shop. I know Chrysler had cheap lifters made in china from about 09-14 for their hemis . I haven't had a chance to look at it yet, but I think the same thing has happened, the lifter rollers lock up and grind the cam lobes down.When the stealership did it, they went back with the same crappy lifters, and said that was what Chrysler makes them do. I told my nephew if I would have done the job I would have replaced the cam, and replaced the MDS lifters with upgraded nonMDS lifters, and command the ecm to disable the MDS system so it would run on 8 cylinders ALL the time
I have a 2013 1500 ram. Cylinder one is miss firing. I replace the coil pack and all the plugs. But still Cylinder 1 is misfiring. I hope its my injector but i dont have a tester. It doesnt run sluggish when i floor it still has a quick take off. Any advice?? Thanks!
Misfire can be caused by lack of or weak spark, poor or no fuel delivery from that injector or mechanical problems in the engine like low compression or a valve that does not open or close properly. A compression test is often inconclusive as valves have lots of time to open at cranking speed. A vacuum gage on the purge solenoid vacuum port might show a valve issue indicated by a pulsing needle. You could try swapping the injector to a different location. Are you sure it's missing on number 1 (the front cylinder on drivers side). Sometimes it flags the wrong cylinder. I'd start by checking compression and comparing to the other cylinders, swap or replace the injector and then pull the valve cover and watch rocker arm movement.
@PhillipBailey I worked it it this pasted weekend. I cleaned the injectors. Re checked the plugs and coiled and they checked out fine. Put everything back together, now computer is saying multiple miss fires. My buddy told me it might be a sensor issue, so I unplug my battery for 30 minutes to reset the computer, plugged it back in and turn it on it was idling how it should be (before it was idling rough) took it for a drive ran perfect, then engine light came on and start idling rough again, and I could feel it misfire. Hooked it up again to computer it still says cylinder 1 and multiple misfires. What could that mean?.. a computer issue or sensor issue? BTW thank you so much for replying back to me!
![ILLSLICK - KILLSHOT REMIX [FULL VERSION]](http://i.ytimg.com/vi/RIK8RrqIAzE/mqdefault.jpg)
09 5.7 with 185,000 miles and experienced a misfire on my #1 cylinder. Replaced the coil pack still a misfire, replaced plugs, misfire. Swapped injector and all good.
ima try that i been getting same issue on my 13
The rest of the story, ended up getting a Jasper rebuild installed. Went with the non-MDS engine.
@@rodneywalden5358 yea i tuned mine mds delete new plugs and coils but it’s weird i only get that code once a while
@@jiovanysanchez6787 that .ames since. Before I decided to go with a different engine I was going to go with rebuilt heads, cam, lifters, plug the mds solinodes and tune the mds out. Glad its working for you.
@@rodneywalden5358 so turned out it was just the coil swapped out one from my older ram and havent got any problems since,,
I like to see how high the spark KV is to see if a cylinder may have low compression which may be due to low intake vacuum, your patterns go off the top of the screen. Thanks for the great case study.
I would think that low compression would lower the spark KV in that cylinder but I never actually looked at that on this system. Interesting thought though trouble is there are other factors that can change the KV so I'm not sure if that would be conclusive or not. Thanks for watching.
Great video Phillip, I like the way u cut the videos by just getting on with the job! Many thanks sandy
Appreciate that Sandy.
Fast forward to 14:45 for the problem. You likely have the same issue. Flat Cam lobe. Pull the valve cover off to watch the valve movement. You have pretty much done everything else. Good luck.
I took my 2010 to mechanic shop knowing the problem already. They ran diagnosis and got back with me and told me that they refuse to work on the motor that the only option I have is to pay $15k for a new motor swap.
(Needs new Cam and lifter)
😂 needless to say I drove it back home and will continue driving it locally here and there. As I have done for the past 4 years.
Most shops won't recommend internal engine repairs as its too expensive with lots of liability. Even the engine rebuilders hardly want to work on them. Maybe try find a used low mileage engine. A newer model engine, up to 2020 will work with some parts swapped
@PhillipBailey I now drive only with MDS cut off. And have turned off my one bad cylinder. So effectively for 2months my V7 Ram has ran better than it has in years.😂 I'm poor. I'll just bury the 220k mileage truck when the motor or transmission sees its last day. For now tho, it's running smoother than ever🤷♂️
Very thorough video, I love the way that you explain all the diagnosis and probable causes, I'm pretty sure that this is the cause of my 07 Ram
It appears to be a common problem. If the computer is flagging a specific cylinder then I'd recommend to swap the coil, swap or replace plugs and if the miss is still on the same cylinder pull valve cover and look at rocker arm travel. Normally a valve problem shows up on the vacuum gage needle but this one didn't for some reason. Good luck
What if the check engine light comes on and it runs like crap for a few miles. then it runs fine and goes off for a few miles. Then it repeats
@@danielreeves4799 you need to get the code or codes it's setting as a starting point. Could be dozens of causes.
P2323 and p0308 check engine is not on right now but it will be back on in a little while
I'm in it as we speak taking it to a dealer
2015 ram v8 5.7
I replaced the cam and lifters now the truck runs way more rough than it did.
The CEL is flashing when previously it was only constantly on.
Bad mechanic? Rpm is constantly high. Dont know what else to fix.
Seems like it got worse than before i replaced the cams and lifters.
Any suggestions?
Well you have to start over again. Figure out what cylinder is misfiring on. Check spark, fuel and mechanical, did you have the heads reconditioned when off? Timing chain time correctly? Did you use stock parts?
I have 2012 ram 1500 5.7 i had misfire cylinder 1 changed sparked plugs made sure they were good still had code put the coil pack on the cylinder 1 that apparently misfire but still have code..truck vibrates as a accelrate but not when i coast i came down to maybe fuel injectors any advice?
If its consistent misfire on cylinder 1 it could be poor fuel delivery from that injector. Change or swap the injector or pull the valve cover off and watch valve movement.
I have a 2011 ram 1500 hemi. Truck starts and runs normal until I get on it Then when I do CEL starts flashing but only for a few seconds. Obviously stating a misfire.. I have changed the oil, all 16 plugs and all 8 coils. Pulling codes states p 0303 which is a cylinder 3 misfire. And it still has the same issue, next most common diagnosis?
Check injector flow compare number 3 to the others, swap injector 3 to a different cylinder if still number 3 remove valve cover and observe valve operation comparing movement of number 3 valves to other cylinders. Good luck
Check valve action at 14:45 in video.
Phillip Bailey could it be a crankshaft sensor?
@@itskaden5237 hello there. I have never had a crank sensor on this cause a misfire. Doubt it very much. Good luck
Phillip Bailey wouldn’t a bad cam or lifter make a tick?
12 Ram 1500 5/7 Laramie drove Texas to Cali I got to San Diego the engine light started flashing under acceleration got a scan cylinder 3 misfire did a tune-up did nothing got 8 miles to gallon all the way back symptom was blown motor metal shavings
That definitely sucks. Do you know what failed? Sounds like another camshaft failure.
I have a 2013 Dodge Charger 5.7. Recently experienced missfire on whole drivers side bank. 1,3,5,7. I have tested injectors , replaced all coils and plugs. Some plugs smelled like gas but not covered in oil or anything.. I have a bi-directional scanner. But I’m lost I have been reading alot of comments and watching videos. I replaced 1,3 injectors with new and no change. Car sounds like a Chevy 😂 misfires at idling soon as you start it up. I hope you still check these comments Thankyou !
It sounds like you have a restricted converter on that bank. The other possibility is a skewed O2 sensor on that bank. Have a look at the short and long term fuel trims. Should be no more than +/- 10%. Try unplugging the forward O2 on bank one. If its still showing misfires try removing the forward O2 and see if the misfires are eliminated. Is so check exhaust backpressure.
Here is an example on an F150 where it was misfiring on all cylinders on one bank. Fast forward to 10.30 in the video for a demo of back pressure testing. th-cam.com/video/gswxFMTBqU8/w-d-xo.html
@@PhillipBailey thanks 😊 for replying. I have long tube headers on this motor with no cats . But I do have 02 sensor codes as well with the p0300, I have p0032. O2S21 is at 0.820V the others are at 1.270V.
@@bignaj3992 if its in closed loop the two forward O2 sensors should be switching between 0.1 and 0.9volts. Typically over 0.45 volt would be rich. Try unplugging the forward O2 sensors. So you don't have rear sensors or you do but just no cats. Are you running a tune to deal with that?
@@PhillipBailey I don’t have an official tune for it , but I’ve been driving it like this perfecting with no problem for a while now up until about 2 days ago. The only mod I needed that I knew of was 02 extender harness to stretch and reach the sensors for the long tube application. The headers came with the open whole to screw in original 02 sensor but I will try to unplug it. I know my scanner will show me what I need to see it’s just hard reading that data . I was able to find the WHICH Cylinder is misfiring. Also injector pulse was at 0 for those specific bank cylinders
Great video, I’m dealing with this now. I replaced plugs, a couple coils, was going to take off the valve cover but decided to do a compression test first and I got 190-200 lbs on all cylinders. Can I rule out valve train?
No a compression test definitely will not rule out valve train as at cranking speeds there is lots of time for the engine to breath. Have to remove the cover and watch the valves move. Hood luck
Phillip Bailey you’re correct. I’m still in shock after doing exactly what you just said a couple days ago. #3&5 barely moved when we cranked it over. We were hoping to find broken valve springs but no dice. Thanks for the reply though.
When u checked for ignition wave forms, I wonder if u noticed the hashing on the No.5 waveform compared to No.1m, If it is related to the misfire, Also wondered why u didn't do a snap throttle test which would help further diagnosing the ignition event.
Regardless very informational video, Thank you very much.
Thanks for pointing that out. You're correct the burn line was quite hashed compared to the other cylinder which would indicate greater turbulence during the burn event. I dont think I would have been able to make a call based on that though. Thanks for watching.
I now have a first look sensor which I'm sure would have detected a vacuum anomaly that might have helped pinpoint the mechanical valve issue. I was surprised the vacuum gage did not show a fluctuations when it was running. That threw me off a bit...
@@PhillipBailey Fair enough, Thanks a lot for replying.
I have a 2010 ram 5.7, with what started as a p303 an now a p300. Compression was good on the 6 cylinders I haven’t gotten to the last 2 in the back. So far I have replaced:
-Alternator
-16 spark plugs
-fuel pump
-cam sensor
-knock sensor
-crank sensor
-Thermostat
-two new coils on cylinders 3 & 5
-two new injectors on cylinder 3 & 5
And I still have a misfire. I don’t want to keep throwing money at it any suggestions?
Wow James, I know your pain, I have the same codes, with good compression too. I’ve replaced some of the same components you have, but no luck. I’m thinking it’s fuel injectors but I’m ready to let a shop take over. What going on with your truck??
Wade Taylor well now I found out the air intake sensor had no current to it so I changed it and also the throttle body, still a misfire. Runs a tad better but it’s definitely a pain in the ass!
James Taylor I recently yanked the fuel rail with the injectors and they were absolutely filthy, cleaned them up and still no dice. So I officially give up and taking it in tomorrow. I’ll let you know what happens!
Wade Taylor do you think if the exhaust is loose that it can cause the misfire? I just put a quart of MMO in the crank case and, STP 5in1 in the tank I still hear the tick but it drives the same just downshifts a tad quicker. Next I’ll check the fuel pressure regulator and the top two oxygen sensors an see what I get!!!!
James Taylor for sure if your exhaust connection at the catalytic converter is lose you will get a misfire. I dropped mine off at a reputable shop. $140 for an hour of diagnostic. I think it’s worth it. I’m beat down! I’ll let you know what they tell me
How is there not a class action law suit over this? Seems like plenty of people have this issue..
Yes its quite common. Often agrivated by driving conditions and service intervals.
@@PhillipBailey Lack of Lubri seems to be the main culprit *
@@dimensionexo. that's possible but I change my oil between 3-4000 miles.. WIX oil filter
Awesome VIDEO it answered my problem.
Great video!!! Having some of the same problems in a 2013 Grand Cherokee 5.7 Laredo; just started having the misfire issues….probably will just ride it till it dies rather than drop 12k for a new engine….any idea how much life I might get out of it still? Has 128k miles
There are other causes of misfire like plugs, coils and injectors. Driving for extended time with a misfire will damage the converter. You should at least eliminate the cheaper fixes. If it is a cam or lifter failure it does not usually blow up in my opinion. It's impossible to say how long. This truck had the miss for around 6 months.
@@PhillipBailey thanks!!!! I have had it in the shop for 3 days and they eliminated plugs (new OEM) and coils being the issue and had #5 cylinder PSI at around 200 since the exhaust valve won’t open properly; no other cylinders are misfiring; if there is metal in the engine, are there any oil treatments/flushes that I can do to help get that stuff into the pan for it o be removed and try to get as much out of it as I can?
@stinkysteve05 not really much you can do without fixing it in my opinion.
Is that the dryer squeaking like that? Couldn't make it pass 2 minutes of that
No sorry was my shop ceiling fan. I've fixed it now. Sorry it bothered you.
Great video! Thank you. Where can I find one of those relay on/off switches?
Available from a few places. These ones are good cause they have a jumper wire you can put an amp clamp over to test current flow. rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F401434937955
Hi ibjust got a 14 ram withbthe 5.7l the light flashes at idle Nd in drive it has no problem but if it idle long enough at a stop light or something like that Nd it will run crPpy and cel will flash and eco light comes on then it clears up like no problem and cel stays solid and runs great and no eco light
What codes is it setting?
I have a p0305 as well and notice not getting any power to injector number 5 check wave length and not getting a reading thinking maybe bad computer
The injector should have power from the ASD relay while running on one wire and is switched in the ground by the pcm. If you're testing for power with just the key in run power will be turned off after two seconds. Compare testing on a know good injector
This was tested while vehicle was on by the mechanic and was not getting and pulse could that 100% be either bad wiring or pcm ??
@ginocrisano4804 usually that should set an injector driver code. I'd try unplugging the injector and see if it sets that code instead of the misfire code. The other logical explanation is the pcm is purposely shutting off the injector as part of its failsafe strategy to protect the converter. I'd connect a noid light on the injector, clear all codes then start the engine to see if the injector works until it sets the misfire code.
My truck is throwing a cylinder 5 misfire. When I pass speeds of 30 my engine light flashes and the truck will shake at a stop. If I go just over 40, my engine light will flash again but runs smooth after that. Any possible diagnosis?
Well the flashing MIL indicates there is a significant misfire potentially damaging the catalyst. If its setting a P0305 then try moving the number 5 coil to a different location. could be sparkplug/s, coil, injector or mechanical. Swapping parts is easy to do and if the problem follows the coil then replace it. You will need to clear the code after moving parts around. You will need additional test equipment if the coil or plugs are not the problem. HTH good luck
@@PhillipBailey i forgot to mention that it flashes a few times. And then stops. I will definitely try that and see if it helps. Thank you very much
@@PhillipBailey Thank you for the advice! Sadly it wasn't the coil or the plugs so have to take it to get diagnosed. Hopefully its something that won't cost much haha
@David Pimentel Took it to a mechanic got it diagnosed. Needed a new camshaft, valve springs, and lifters
@@christianflores6626 ouch thats not cheap...
Puede aver algo con el harness
No worn cam lobe
Will it pass a compression test with the cam lobe worn out like this?
Yes most of the time it will since at cranking speeds during the compression test you have lots of time for air to enter and or exit the cylinder. A running compression test using a pressure tranducer and a labscope should show it though.
My daughter's 2009 police persuit Charger has a miss in cylinder's 1 and 2, mostly under load. I replaced all of the coil packs and spark plugs and that did not solve the problem. What should I do next? Anyone have any ideas?
Since you have replaced the ignition components and nothing has changed that leaves fuel injectors and mechanical. An injector flow test might show a difference between cylinders or swapping the injectors between cylinders. Then there's valvetrain operation. Remove a valvecover and watch valve movement. Could be a flat cam lobe.
@@PhillipBailey Thank you sir for a great next starting point.
Dodge has Serious issues with camshaft, my next truck will be Chevy or Toyota..
In my opinion they all have issues. I'm seriously considering plug in electric as soon as someone sells an electric truck!
Ford will have one next year I think.
Have a missfire in number 3 on my 2015 ram changed spark plug coil pack injector still misfiring under acceleration did compression test got 210
Compression test will not catch a flat or worn cam lobe. There is plenty of time to get air into and out of the cylinder at cranking speed. Make sure the injector is delivering fuel. A flow test would be in order but if you don't have that equipment pull the valve cover and watch the valve movement while cranking. Hope this helps.
I'm getting P0304 (cylinder 4 misfire) and p1414 (Secondary Air Injection System Monitor circuit High Voltage). Any idea what the cause might be? I've tried swapping the coil and the spark plugs.
A misfire can be caused by a number of things. Sparkplug, coil, injector not delivering proper fuel and internal engine problems like low compression, improper valve operation as this one had. Pretty common for lifter failures on these engines. P1414 is probably related to the P0304 and is a problem with the solenoid that controls the MSD lifters on number 4. Not an air pump code and unless you are in California I doubt the truck has an air pump. Research the P1414 problem. HTH
@@PhillipBailey I'm having a similar issue, Firestone diagnosed it as a low compression in cylinder 3, but the issue goes away. I just drove it for 2 straight days and the check engine light went off. Then came back on today along with the vibration. If it's low compression wouldn't it misfire ALL the time?
@@BryanIrvine yes I agree a low compression problem caused by valves not sealing or piston ring problems should be very consistent. A collapsed lifter could come and go though if the lifter pumps up again. What have you done to attempt to fix it already?
@@PhillipBailey so far all I’ve done is ignition tune. It’s been inconsistent enough that I thought maybe it was a coil pack. When it the vibration got more consistent I took it in for diagnosis. I used to be able to make the vibration and check engine light go away just by turning it off and on again at a light. Some days it’s barely drivable. Then sometimes it’ll go two days acting like nothing is wrong at all. I’ve tried driving it in tow/haul to see if maybe it’s related to the MDS but that made no difference. I’m starting to lean towards goofy lifter/cam issue. Maybe it tested as low compression because a valve isn’t closing? 🤔
6.1 challenger..started with o2 sensor codes. Replaced. Then p0300 and p0303. Obd2 showed misfires on cylinder 3 & 8 Replaced plug and coil. Then got o2 code again for fuel being too lean. Switched o2 sensors around and now I'm getting misfire diagnosis on cylinder 3 and 6 but without a code.??
What are you using as a scanner? What are the short term and long term fuel trims running at during the miss?
@@PhillipBailey bluedriver, but I'm not that savvy with it to scope out fuel trims with it...
@@mikeprice8307 bluedriver should be able to display the short term and long term fuel trims on bank 1 and 2. If they are greater than 10% plus or minus it indicates a problem. Plus trims suggest the engine is running lean due to things like low fuel pressure or an induction leak. Negative trims suggest the engine is running rich possibly high fuel pressure. If one side is affected more than the other you have a problem on that bank. You might have a restricted catalytic converter as well good luck
@@PhillipBailey thank you for your wisdom.
@@PhillipBailey long term fuel trim bank 1 13.3%
You can be my mechanic ! great video and scads of knowledge! Thanks for posting!
I have a 2012 Ram 1500 5.7 and says misfire cylinder 3 ruff idle accelerates ruff under load
Process of elimination. Start by changing or swapping plugs and coils, test fuel injector flow, compression test and last check the valve movement
My 2012 intake isn't even moving at all when I turn it over. Would that also be cam and lifter as well?
if the rocker arm doesn't move like the others the camshaft lobe is worn off. Requires cylinder heads removed and front of engine disassembled to remove the cam and lifters. Not a cheap job.
@Voorhees666Drummer thats a tough call. My customer opted to replsce the engine assembly with a reman. They did the job themselves. My guess to repair the engine would be around $5500.00 CAN. . So much depends on what else you do while in there. You have to remove the heads for instance so do you have them rebuilt while they are off? Do you replace all the lifters or just tge failed ones, new water pump? Do you remove the engine completely or just the heads in the vehicle. I'd recommend engine removal as its much easier to work on once out.
@@PhillipBailey do you recommend a new engine
@@pineappleexpressnetwork4942 well to do a cam and lifters tge heads have to be removed so it's pretty intensive work. You have to consider the overall condition of the truck and value before and after. Even a used engine is an option but not a good one in my opinion. (You have a used one now). Good luck.
Could this cause a misfire on two cylinders that are across from each other? I have one that has 5 and 6 misfire. Swapped coils and no change. Will do plugs on Monday and see if there's a change. #6 piston is wet, #5 is dry if that's relevant. Thanks
Usually it only affects one cylinder and it appears to be most common for number 5 to fail. That being said it could also be a bad coil or injector. Have to eliminate one at a time. Good luck
@@PhillipBailey so I don't think I cleared the codes after swapping the coils. Would it still read a misfire on the original cylinder even though the coils been swapped?
@@SJJ1776 if your watching misfire data on a scan tool it should stop missing if the coil was the problem. If your just reading codes then yes you need to clear them then reroad test and rescan.
@@PhillipBailey ok I'm watching the data
@@PhillipBailey also i can hear the injectors firing with a stethoscope
Perhaps it's just a Cracked Valve Cover Spring??
A broken valve spring can cause a misfire but it would not account for the lack of valve opening. Cam lobe is worn out.
Did you replace the camshaft ?
The customer bought a remanufactured engine and installed it themselves.
@@PhillipBailey just watched a vid of a camshaft replacement. Doesn’t look fun wonder if swapping the engine is a better choice !
@@josephl4874 replacing the cam requires both heads be removed so it's a major job for sure.
Great video instructions
Thanks for watching.
Does this throw a check engine light?
🤦♂️
Misfire p0301 zero issues runs fine tons of power like normal idles smooth bought it used sat for a year what do you think? I'm going to put in new plugs and swap the coil pack to cylinder 2 to see if it moves over hopefully it's just the coilpack
The misfire algorithm is pretty sensitive on these. It may feel smooth to you but computer is seeing something. Yes plugs and swap coil for sure. Say a prayer if you're religious. Good luck
@@PhillipBailey changed the two spark plugs in cylinder 1 for code p0301. Code has went away not seeing any misfire codes. I disconnected all my cat sensors though the truck was acting up when they were on. Been sitting for over a year I guess they gone bad gonna need to change them all. Has 4 o2 sensors
@@isauroalfredobanuelos6342 just change the two forward ones first. The rear ones are for converter monitor and don't usually affect drivability.
What does TCC mean?
Torque converter clutch.
I have a 2012 dosge ram it has a miss fire on cilinder 2
What have you done to try to fix it?
@@PhillipBailey crickets lol
@@NickFortier squeaky ceiling fan, finally fixed it lol
Hello Mr.Bailey,
I have been having an issue with my 2012 ram 1500 5.7 4wd. I have a video posted on TH-cam. "2012 dodge ram 5.7 4wd no start please help" Cranks but doesn't start. Code p0308. New spark plugs were replaced 8mo ago. I swapped the 8th coil. New battery installed. Still no start. I cleaned just about ever electrical connector under the hood, including under the fuse box. It will turn over if I do not start the truck over extended period of time.. Please please help me if possible
At how many miles did it happen?
200,000 klm or 120,000 miles
@@PhillipBailey 130k here
Thanks for a GREAT video. My nephew spent $4500 to get his cam and lifters replaced on his 5.7 at the dealer where he is a salesman, four months ago. Now it is missing real bad, so I told him to bring it to me and I would put my scanner on it and check it out. I'm 71 and retired and have never had a vehicle in a shop. I know Chrysler had cheap lifters made in china from about 09-14 for their hemis . I haven't had a chance to look at it yet, but I think the same thing has happened, the lifter rollers lock up and grind the cam lobes down.When the stealership did it, they went back with the same crappy lifters, and said that was what Chrysler makes them do. I told my nephew if I would have done the job I would have replaced the cam, and replaced the MDS lifters with upgraded nonMDS lifters, and command the ecm to disable the MDS system so it would run on 8 cylinders ALL the time
Yes good idea.
I have same problem, w my ram, 2010,
A9a
I have a 2013 1500 ram. Cylinder one is miss firing. I replace the coil pack and all the plugs. But still Cylinder 1 is misfiring. I hope its my injector but i dont have a tester. It doesnt run sluggish when i floor it still has a quick take off. Any advice?? Thanks!
Misfire can be caused by lack of or weak spark, poor or no fuel delivery from that injector or mechanical problems in the engine like low compression or a valve that does not open or close properly. A compression test is often inconclusive as valves have lots of time to open at cranking speed. A vacuum gage on the purge solenoid vacuum port might show a valve issue indicated by a pulsing needle. You could try swapping the injector to a different location. Are you sure it's missing on number 1 (the front cylinder on drivers side). Sometimes it flags the wrong cylinder. I'd start by checking compression and comparing to the other cylinders, swap or replace the injector and then pull the valve cover and watch rocker arm movement.
@PhillipBailey I worked it it this pasted weekend. I cleaned the injectors. Re checked the plugs and coiled and they checked out fine. Put everything back together, now computer is saying multiple miss fires. My buddy told me it might be a sensor issue, so I unplug my battery for 30 minutes to reset the computer, plugged it back in and turn it on it was idling how it should be (before it was idling rough) took it for a drive ran perfect, then engine light came on and start idling rough again, and I could feel it misfire. Hooked it up again to computer it still says cylinder 1 and multiple misfires. What could that mean?.. a computer issue or sensor issue? BTW thank you so much for replying back to me!
@@xAvengerxDudeMann I'd say to pull off the left valve cover and check the valve movement carefully.