Check Engine Light DISABLED! Codes hidden from Driver! 1994-2004 Ford Mustang GT 4.6
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- เผยแพร่เมื่อ 24 ส.ค. 2024
- Part 2 Engine Accessory Overhaul! Running Rich-SOLVED! 2003 Ford Mustang GT 4.6 • Engine Accessory Overh...
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Part 2 Engine Accessory Overhaul! Running Rich-SOLVED! 2003 Ford Mustang GT 4.6 th-cam.com/video/Ul1uyExVNXk/w-d-xo.html
The eagle-eyed machanic does it again! It never fails to amaze me how nothing gets past Rainman Ray. Attention to detail and meticulous fault finding. A breath of fresh air in the Car repair industry.
As an armchair mechanic I want to thank you for your videos. I feel like I'm in the shop along with you figuting out how to fix things I will never attempt. Wish I had you as our family mechanic.
Ray's step by step troubleshooting is impressive and his ability to communicate what he is thinking and doing is second to none.
Around and around and around we go, where we stop, no one knows! Another excellent Rainman Ray diagnostic episode! Sometimes, you have to go down the rabbit hole to find the problem.
i love when ray gets scientifically with his words
Go science!!
$ 5 college word.
@@clbcl5😂😂😂😂
yeah and we might learn some from it aswell :)
@@RainmanRaysRepairs You shoulda been a rocket surgeon; I think missed your calling Ray!
Ray, when you unplug the fuel pressure regulator, you change the fuel pressure, which WILL change the fuel trims. This is not confirmation of a vacuum leak.
I believe you confirmed it was an electrical issue. I would check what the fuel pressure is supposed to be at idle relative to,spec.
Yes, fuel trims are trying to compensate for too much fuel pressure. It's like creating one problem that cancels out another but only gonna work at idle, no load etc.
Awesome vacuum system troubleshooting video, Ray!
As always, I really appreciate and enjoy watching the thorough way you systematically check out possible causes!
Have a GREAT day, Mr. Ray!
One of Ray’s best videos for some time - I like the diagnostic ones. Thanks. 👍🏻
they are good
Ray, the highest compliment I can give you is that I feel a bit smarter after watching your videos than I was prior to watching it. Excellent work on the vacuum diagnosis!
On the other hand, that scan tool could have saved you a bit of time by putting the short term and long term trims next to one another so you don't have to scroll.
After he checked both sets of trims the second time, I was asking why the scan tool didn't show them one following the other. Techs are going to get carpal tunnel scrolling up and down looking for trim levels! LOL!
He probably can enable some mode where he can pick data to graph or something
People that are selling a car and mask problems by disabling the check engine light are the worst people.
I agree, I learned to check for the check engine light self-test, the hard way… Got taken badly by a deceptive seller…
Not only bad people, also highly illegal in all 50 states. Falsification of data that could lead to bodily harm is I believe a felon in most states, but correct me if I'm wrong.
I always bring a scan tool. I plug it in with owner’s permission. It’s fun to watch them squirm and sweat.
It should be criminal. Fraud.
It's beyond me how people that do things like that to sell the car can sleep at night.
Love the diag videos as well. Always a great start to my mornings with a cup of Joe, thanks Ray
As a wantabe, usually havetobe mechanic, I have always been confused about the long term trims and short term trims. Your continual explanations, which I really appreciate, have helped me understand that relationship. Also, this video was a master's degree course on how to isolate vacuum issues. Thanks for this video and so, so many others that have helped me turn mystery into simple solutions. My encouragement to you to keep producing those "very good videos."
Long terms are a trend to help compensate for aging and or wear. Say ypu have a small vac leak that's been there for a while, y o ur long terms will be positive (adding) around 10 or so for example. Shorts will waver back and forth around 0 up and down.
Remember with long term at 10 pos. , it's added to the baseline, so zero os actually plus 10 over what's expected.
This helps in starting etc since long term sets the baseline bit if you hit 30 or 25 on long terms they peg and trip the mil.
On an older car if your long terms are 10 or less either way is generally considered good.
Computer can actually adjust a lot. I took off my oil cap and was at plus 45.
Seems like it would be easier and more definitive to test the pressure regulator by using a vacuum tester to put a vacuum on it and seeing if it holds vacuum. Connecting and disconnecting the vac line from it changes the fuel pressure in the rail so it’s not surprising the fuel trims change too.
Same with the EGR valve.
Well done Ray. Really digging into the vacuum system to locate the leak is really educational and super helpful. Any who has a scan tool also will get a better understanding of the short and long term trims. Also connecting the vacuum leak to the changes in these trims makes it easier to locate. Thank you Ray 👍👍👍💯💯💯🔧🔧🔧🧑🔧🧑🔧🧑🔧
Ray's announcement about other shops SHOCKS the entire car industry, and Ray is mad as hell about it! 🤣🤣🤣
shots fired!
I smell a certain Toyota Only lover comment! LOL
@@Butchcub75 Rubarsu, actually! (I can't afford an older Toyota because they've gone up so much in value lately.)
lol I meant Scotty Kilmer@@Rekuzan
@@Butchcub75 I KNOW, that's what makes it so funny! God only knows that Celica will outlive him!!! 🤣🤣🤣
If my knowledge of Fords is correct, which may not be, the automatic transmissions rely on the MAF sensor to tell the computer how much air is being drawn into the engine, so if there's a vacuum leak after the sensor it can actually cause transmission problems if it's bad enough.
Excellent video. Thank You! I am having this issue with my wife's Land Rover. I have never taken it to the dealer, I'm afraid to and I don't have decent shop around me. Sad part is, there was a great independent shop down the road from me. The manager retired and the folks he worked with disappeared. All new folks came in and they are dishonest. The techniques Ray showed us here will help me track this down. I have been watching his videos for a couple years now, they have made me a much better mechanic. Heck, I'm not a mechanic.
The CEL is the service engine soon light, its working fine!
Its not a pressure regulator as there is no return line, its a pressure sensor to tell the ecu to vary voltage to the pump to keep consistent pressure. Of course taking away its vacuum will change it.
That hole in the intake tube was a vacuum leak. Its where the iat sensor goes on 96-00, in 01-04 the iat is built into the maf, but most aftermarket cold air pipes have the hole there to cover use for all years.
Fuel leaking out the tank is most likely the rubber from the tank to filler neck.
Muscle Cars have replaced the PT Cruisers! 🎉
Not really those 2 Dodges he stated aren’t really that much better than Cruisers by Plymouth.
The more I watch your videos the more impressed I am of the skills it takes to be a repair technician. Great job Ray of showing the diagnostic method and approach for solving the issues on this Mustang.
Very cool to see the vacuum system diagnosed. Never seen that done yet. Brilliant. 😍
Excellent troubleshooting logic. It really helps when you have all those fancy tools and equipment.
Another great video! I am surprised the scan tool won't let you pick which PIDs to display - would have made life easier for you having a display with just the long and short term fuel trims shown!
Honestly, there is a far easier way to check for vacuum leaks. I do it all of the time when checking carbs and crankcases. I use a Craftsman hand-held vacuum pump. You're plugging this and that off, while running back and forth to your scan tool. In 5 minutes you could have checked everything for a vacuum leak. Sometimes Old School is better than the latest, greatest scan tool.
Interesting! What does this tool looks like? High end Bi-directional scan tool are not cheap for DIY.
@@user-dc2kg2hm8c I posted a link so you can see what it looks like.
correct me if i'm wrong, but that would certainly verify that there was a leak, but not where? he did something similar when he capped off the entire vaccum system. It told him he had a probable leak, but not where.
him going back and forth to the scan tool was him trying to isolate where exactly the leak was.
@@user-dc2kg2hm8c any brake vaccum bleed kit pump would do the trick. If you want to go full redneck you can use a propane torch (not lit) or flamable spray and put it where you suspect the leak. If you have a leak in the area it will suck up fuel as well as air and the engine sound will change.
@@animefreak5757, with the vacuum pump, you just switch it from one hose to another, and give each hose a couple of pumps to see if it's leaking.
Another great video I definitely like watching you diagnose problems with your high tech equipment and your deductive reasoning! The entire video was very interesting 💯💯. Have a great weekend and stay cool.
Doctor ray in the house such a pain in the ass all these codes and ecm stuff bring back the old days no computers turn the key and go
Propane and watching the 02 sensors is still my favorite way to find vacuum leaks.
At 15:18, the 'Service Engine Soon' is clearly illuminated and goes out after the startup test.
Another outstanding video Ray your the best at what you do but the most important thing is to have your self a great day Ray
10-4 great Saturday in progress!
Amen indeed 🙌
163rd! GOOD SATURDAY MORNING RAY AND THE WIFE UNIT! Best wishes to the two new employees! They help the shop run smoothly! Roger in Pierre South Dakota
I'm going to check mine now. I had this almost same issue. I already replaced the EGR valve. I'm going to just order the other part and install it. Not expensive at all, and take a few mins. I will also check the values before and after as well.
Ray goes for the throat when troubleshooting. I've learned so much watching your methods and you never cease to impress me with your diligence.
Ray I love your videos they're relaxing and very amusing, but today's video showed how much you have to know to do the job that you accomplish. It is extremely impressive how you diligently go down the line to find out what is wrong. Most impressive Ray. I myself don't know very much about repairing a car what it's nice to learn things from you thank you.
106° here today, my fantastic day will be spent indoors!
I remember back in tech school ('95-'97) they had JUST introduced the smoke machine as a concept to the entire industry; before that, it was a can of starting fluid and your own ears.
That how I used to check for leaks spray can
I don't know how many circles you did but you successfully got thier mate .
Disabling the CEL is a classic Craigslist/Marketplace flipper trick.
Also SRS/Airbag malfunction indicator. 😒
Ray must be a hoot at his yearly physical with his process of elimination finding a problem he did not know he had.
Ray, I may be incorrect, but isn’t the service engine soon light the equivalent of a check engine light? The koeo revealed the light illuminated, but did not remain on. While it appears you did find a fault, maybe it wasn’t enough to trigger the light. Anyways, as a fellow tech in the field, I’ve been watching and enjoying your content! Keep up the good work!
Amazing troubleshooting Ray! You find things I think 98% of other techs would miss. Enjoyed the hunt.
The red vacuum Lines on the throttle body is the Hvac Vacuum Lines 30:00 @Rainman Ray's Repairs
Good video between the intake having unmetered air and the regulator leaking vacuum it got complicated. It occurred to me that the open intake port could introduce dirt to the throttle body.
I'm concerned for the car being driven though a puddle or high water, and ingesting water through the aftermarket "cold air" intake package. Hello, hydrolock. 😲
Nice job again! You show us how important it is for a technician to fully understand the operating systems. Any of us can plug in the scan tool and look at various readings/faults but what is it telling us needs to done? For most of us ... duuuhhh. Thanks again for being a professional tech and being able to narrate while you are doing all this stuff mostly one handed!!
I always enjoy watching you diagnose problems! You are extremely thorough!
Yeah you got this hard to believe a decent honest mechanic
Good video, some of your previous videos seemed to be getting repetitive and I was beginning to lose interest however I enjoyed this one…well done
I appreciate the way you narrowed that down but you need a scan tool that isolates pids so you’re not going crazy back and forth. Treat yourself you deserve it. ❤
That scan tool was a fortune too. I really am grateful to those that go into hoc to buy one.
If you get a better scantool you can adjust your menues to show both short and long term without scrolling, maybe you can do that on snapon too?? ;)
The “Service Engine Soon” light did come on during the bulb check.
Reminds me of trouble shooting pitot static leaks on an airplane... keep capping stuff off until the leak stops. Great work troubleshooting Ray, awesome video.
WOW....the time you took investigating that vacuum issue was intense. Very nice job ray. You have to tell us what the final results were on this one.
Ray on your Snapon scan tool you should be able to isolate the 2 compensates you want to watch eliminating the need to move up and down in the scale.
I thought the same thing. I don't have a scan tool so I wasn't sure.
He likely doesn't know how to do it
I think the hole you plugged was for an intake temp sensor. Not sure if those Mustangs have one for that spot but mine does.
Certainly a step up from PT Cruisers and old beater Jeeps.
Ray . That fpr has an oring at the base of it . Test again to see if the pressure spikes with vac remove . It should default. If it does its a leak not a malfunctioning fps and an ring will cure the issue .
I like the way you take your time to Figure out what's wrong. You are very Honest at what you do just wanted to say thank you for your Video. God bless you and your family and your Business.
Ray. Thats because when u unplug the FPR.. it raises fuel psi 5 psi or so. There fore richening the mixture. When you plug vac into it it lowers it.. leaning it out. Thats why the fuel trims reflected that.....
I probably would have done the parts canon and seen if new upstream o2's fixed it and been scratching my head. I appreciate the devotion and passion you have in mechanic work. I learn so much from these diag videos on how I can improve what I do in my own ventures. Thank you as always for being a great teacher, and great entertainment for us all.
Great video Ray! Loved it,and it was explained so well. I like that you attacked the vaccum leak from a couple angles to get a accurate assessment of exactly what was going wrong.
Another great movie you need to see is "Nobody". It stars Bob Odenkirk from Better Call Saul and Breaking Bad, and it was written by the same guy that made John Wick. It's fantastic!
Good process of elimination and finding the fuel pressure regulator has a vacuum leak internally i have seen this a ton before on fords its normally the hvac unit internally leaking vacuum 41:23 @Rainman Ray's Repairs
A problem leads to the problem.. Love the process of elimination, it works every time 👊
Very interesting as a non mechanic but car lover. They way you always make sure you cross your t's and dot your i's is always amazing. A☆ as always. One of the best things to happen to me whilst watching YT was when I was recommended your channel n so glad I clicked it too
How refreshing, no more Jeepers and PT hangovers!😂👍
Best vacuum leak troubleshoot video ever on the internet !
A hand-operated vacuum pump is a handy tool for finding leaks and bad diaphragms even with the engine off, like a decompression test instead of a compression test.
I always especially enjoy your diagnostic videos. It's like watching Columbo in action.
YOUR VIDEOS ARE SUCH A SOURCE OF INFORMATION EVEN THOUGH MY 'CAR' HAS ONLY TWO WHEELS (MOTORCYCLE). I HE TIPS AND TECHNIQUES ARE I VALUABLE.
Good job, Ray. Imagine how hard that would be if pre-scantool? Really thorough diag.
Pre scan tool, there wouldn't be any sensors like these TO scan. That being said, Ray is great.
I have two for my 1991 Explorer (purchased new). A bit crude, but it works. One is basic to count led blinks and one (newer) is programmed to count them for you.
haaaa nice@@CJRoberts8812
Hey Ray. I love your persistence in finding problems and your patience in dealing with them, not to mention your wacky humor. I want to add something though. Unhooking the pressure sensor causes the sensor to reference atmospheric pressure instead of manifold pressure, which causes about an 8 psi fuel pressure increase. That could mask some other lean condition. Just a guess, but it's possible that the aftermarket cold air pipe doesn't match up with the mass air sensor properly, so the air reading is skewed, at least at idle. I've had this problem on Mustang cold air systems that aren't properly matched up. Increasing the fuel pressure might be compensating your fuel trims and leading you astray. Also, it might be missing the intake air temp sensor (where you plugged the pipe) or the sensor might be located wrong, which might be adding another variable. Thanks again for all that you do!
That was the best fuel trim disgnosis I've seen in a while, better than any chalk board explanation. I love the fact that you foloowed a logicat trail and explained the process of elimination to narrow down the actial problem. I don't think I would have considered checking the fuel rail pressure sensor as a cause of rich trims. I have seen lean conditions from weak fuel pumps, but this was a first for me. That's when decades in the trenches comes to bear. Congrats on the diagnosis.
Did a 09 Crown Vic 4 cam for a friend a squirrel 🐿️ had chewed through the rubber vacuum junction & was living in the air box.Have a great weekend
Nice diag process. Wish my shop would let me try in depth diags in this manner. Kudos man.
That is the problem some shops don't give technisions time to do an accurate diagnosis 😢
@@michaelpressman7203 the sad part is, up here in the rust belt, the book quotes are severely inaccurate. A job that books at 4 hrs takes at least 6 because of the rust and corrosion from the salt brine in winter.
You can also do some static testing of vacuum operated devices that use a simple diaphragm. Just connect your hand operated vacuum pump to the device, evacuate appropriately, then give it a few minutes and watch the vacuum gauge to see if it loses vacuum too fast.
I'd say the rad is probably OK. They probably changed the hose (spilled) thermostat (spilled) and the coolant bottle is probably from overheating/boiling/filling
I really like the diag videos. Its nice to play detective and watch you tracing down the issue
Take a look at a Ford emblem, see the line one it at the edge? Even Ford Circled the Problems! LOL 😂🤣😋
Awesome diag video! Pick a starting point and eliminate possibilities until you find the offending unit! 👍👍
You are a really good and thorough mechanic, subscriber earned! 👍
The reason you can use a UV is because they use small amounts of PAG oil to lubricate the compressor, but when they do a decay test it pulls out EVERYTHING, so you inject PAG oil and it already has an ultraviolet dye inside the oil so you can use a tool to diagnose a leak
What a great bit of diagnosis work.
At least it has real tire treads, unlike so many ya get that are beyond dangerous
Great focus, I hope we get a pt2
That’s real good, old style diagnostics. Know how is it working and checking part after part. Well done.
Regards from Belgium
I would say the trims are not off that much and watching them at idle and not while driving isn’t a great way to look at them. The pressure reading and unplugging the connector naturally when the computer see 90psi of fuel pressure it will start pulling fuel trims lower. The gps of the MAF was around 6 or more most times I could catch it. That’s to high at idle and will be adding fuel to engine also. Hot rod owner probably has a oil soaked K&N filter and has got the MAF wire coated. Between that and the change of the intake design probably has fuel trims whacked
Same thing happened to my wife's stang. We discovered the fuel leak while moving from Virginia to Indiana, it was the o-ring that connects the filler tube to the tank.
That was a hell of a diagnostic procedure, Ray!
Back years ago I had this Newer Chevy Express work van come to my shop. Van had an evap leak amd had the purge solenoid changed 3 times by different shops before I got it. After smoke testing I was pointed to a leaking purge valve again. But rather than replacing it I realized that someone installed it backwards causing a leak and the two following techs installed 2 new valves backward as well. The connector wire was so tight I'm surprised it didn't break.
I really like how u diagnose cars ur very thorough. I learned alot .Great video .I have a 03 mustang. So seeing this video helped me inspect my own car better
briliant work ray... that is how to now how you do it !!
Ray you are a genius/car
I wish your shop was in the dmv…
I'm surprised that regulator didn't show up with the smoke test.
Ray: don't forget about that massive leak on the intake pipe.
What is that port for anyway?
I would think that extra port could be for air temp sensor that this particular vehicle may not use. Maybe ???
it's possible that there wasn't a vacuum leak at all, and the regulator is faulty and providing more or less fuel pressure than indicated.
I assume the fuel pressure regulator keeps a constant pressure across the fuel injectors (fuel rail to intake manifold). It seems like unplugging the manifold vacuum reference (so it gets atmospheric pressure) will increase the fuel rail pressure - the scan tool shows this. The intake manifold pressure will stay about the same, so the pressure across the fuel injectors will increase & they'll flow more & inject more fuel. The ECU fuel trims will then go down to compensate for the extra fuel flow.
Thank you for doing these videos!
Wow, you sense something amiss, and don't give up until you get a conviction! Great video, it is amazing how you picked up on the trouble light not blinking on start-up.
I like it that there is no swearing in any of your videos.
You really know how to go down the rabbit hole Ray, great video, now i know how to use the long and short term fuel trim to find a vacuum leak, you are the best!!!!.
Love the process you went through. Enjoyable video.
Loved watching this diag video. Had an idea with the smoke machine..would it of been possible to use the smoke to ferret out the leak if it was in one of the vacuum line's and not the fuel pressure sensor?
Time for the scannertool to implement filtering so you don't have to browse up and down to see the 4 sensors you're interested in.
This is EXACTLY why I always bring my code reader and pull a full scan BEFORE I ever buy a vehicle. A good top quality scanner can save your a$$.