Hard to find Ls Engine Knock? Watch this!
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- เผยแพร่เมื่อ 20 ธ.ค. 2022
- This video will help you determine if you have a cam, lifter or both that is coming apart. This is so common on ls engines. Like the 5.7 hemi the cam or lifter begins to spall and they wipe out each other. This will help you understand the process to diagnose and fix this problem. Good luck!
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Had this noise on my LM7 04 5.3, lobe and lifters were fine, noise was intake valve seat recession, replaced heads and job done
12.22.22. That was a superb way to confirm a diagnosis of a suspected cam lobe/lifter issue🔧…..”test don’t guess”™️
Thanks, Agreed. You learn and get great new ideas and got to try them out. Just glad this worked out and I could share it.
We need you to come back to TH-cam sir!!! 🔥🔥🔥💪🏿💪🏿💪🏿
Thank you for the video 😊
New subscriber!!! 🔥🔥🔥
shouldn't oil be coming from the push rods over the rockers for lubrication? Didn't see a drop come out while you were running it.
Good point. I would say yes. New lifters pumped right up. I saw this too after I posted. Good find.
This usually starts after the oil warms up completely or at slightly higher rpm than idle. Pre-load on the lifter also affects this, on my Pontiac engines I adjust for 'zero lash' with the engine running at idle with poly locks- this really wakes those engines up and oil flow seems to increase through the pushrod.
@@Brainstangs I have a Sikora problem I think on a 98 trans am. How do I contact you ?
Where are you located ?
You’re video helped me find my problem right away. Thanks for sharing!
Damn, maybe just figured out my issue!
Man your content is great…. lol I’m selling all my LS vehicles and going Toyota for my daily s ….
Wow, usually the center two cylinders on each side are the ones chewing stuff up. Seems kinda dry when the engine was running without the valve covers though.
What scan tool were u using to see misfires?
My 2004 5.3 Silverado developed this noise around 60,000 miles with constant oil changes (2500 miles) with mobil 1 oil and filling the oil filter to prevent dry startup.
Wondering if mobile 1 is garbage, lifter/cam not good quality or oiling issue in the block.
Outstanding video and information- thank you
Mobil one is a good oil, but the viscosity the factory calls (5w20?), isnt for lead foot.
'The noise' could be anything
The noise is the 'Effect'.
Fix the 'Cause' otherwise the Effect will Re-occur ..
In this video, there didn't appear to be a drop of oil coming out of the push rods with engine running. Also seems like plastic roller guide keepers were not checked for wear that allows Rollers to wobble on the cam instead of running true (like a bad wheel alignment).
#operationls
o ring on the pick up tube and sump in the oil pan goes bad from cavitation where they drilled the tube intake cover before it gets to the pump gears and they changed drill type and direction, that hard 90º needs fixing with a grinder to smooth the flow instead of cavitation. oil pressure below 40psi on the gauge should tell you at any time.
gm faulty design, but they changed the oil pump 2014+ series, idk when, but the new oil pump is very pressure sensitive in how it self adjusts really neat way to demand responses of the engine from high rpm to low rpm shifts. be nicer to your vehicle with smoother shift speeds not 5k rpm down to 2+k rpm
here is what to look for to modify with a dremmel Small block Chevy oil pump
maldo72 5.91K subscribers 67,282 views Jan 30, 2023 Small block Chevy oil pump
It would have been really interesting to see if a compression test gauge could have picked up that #7cylinder was faulty ... ?
Mine has a noise like forged piston slap with a very minor squeek... the noise sometimes comes and goes which is very strange and my oil pressure sometimes drops below 15psi when you're idling but at 2000 RPM comes right back up to 45...
Did you check Oil pump/pressure with an independent guahe ? There wasn't a drop of oil coming out of those Push rods it seemed.
Also did you check the Plastic Roller Guides for wear ? They are crucial(and fail) to keep those Rollers running straight (not wobbling) on the Cam Lobes ..
Otherwise, this could all happen again .. quicker next time.
PS Never assume new Cheap plastic Roller guides are any better than the old worn original ones ... they are sometimes worse and must also be checked for wobble..
From what I've heard, the lifter trays are responsible for keeping the lifter roller inline with the cam. They wear and the roller starts to oscillate causing cam wear. One mode of failure.
These were right upon removing. However yes I agree that would be a cause too
Definitely do not buy the cheap China lifter trays! Too much play!
Where is your shop?
i am at this stage with a 2013 AFM DOD lt silverado and just found the #4 intake lifter collapsed and inspected the cam and saw 'spalling' on it the lifter roller itself is just collapsed solid with the beginning of drag spalling on the roller so 123k miles but at 100k i was getting random 1-3 times a year stabil track auto disabling and had no idea why. when you get stabil track and traction control disabling, your about to lose oil pressure within 10-300 miles.
i had a 2000 silverado also that had lifter noise on warm up, now i know why the original owner took it to the dealership and traded it in, i bet he took it to service first and heard the price tag on the repair and just decided the trade in value was better on a new truck. i still have that truck bought it with 113k and it's got 320k on it, but at 280k it was getting misfires and the lifter noise was alot more constant, but i knew nothing and just changed the oil which came out fine but started to get black before 3k miles. lucas high mileage synthetic helped it with the lifter tick since 150k when i first decided to see if that would help which it did considerably. idr why but the synthetics are just more slippery and for longer than conventional and keep the oil golden for longer.
now i know what it means after watching a few of these afm dod issue videos, that's the first sign you have a lifter beginning failure the stabil trak warnings. normally i shut that stuff off when i start up in the winter because i'm a snow plow driver and i know how to drive in snow better than those woman driver aids can help, which actually interferes with compensating in snow and ice. but they are great for woman drivers because the feedback will scare the living hell out of them and make them slow down keeping them out of the ditch mostly.
i drive like an old grandpa or F1 driver kimi riakkonen depending upon the traffic.
Where is your shop located? I have some noise coming from my bottom end on a fresh 6.0 ls build. Doesn't sound healthy
#operationls
After seeing this I'm tempted to add something super slippery to my 5.3's crankcase.
Great insight and lesson to repair!
Have a 4.8 knock in the morning at start (210k miles).
Noise goes away once idles down. Rest of the day start up without noise?
Runs great, no oil drip or burn.
What do you think?
Sounds like piston slap. Common and basically harmless on those.
@@rasheedx5322 Perhaps, but I did discover wrong weight oil was an issue. Seems as though if oil is up in the rockers noise is not heard. Cold start it's heard briefly. Heck, so many miles can't really expect much more from the beast.
What year vehicle is this?? ..ty
I had the same problem,on number 7 cylinder, I taking everything apart.the lifters worm down and cam.I tell everyone having this issue, please replace cam , lifters,time chain and oil pump,Mt truck is 2008 Silverado 4.8 with
250000 miles.Im back rolling now these are some good engine .16 years I had my truck
I'm going to try to get another 16 years out my engine
If you would have taken some carburetor cleaner, and some snap ring pliers, you could’ve got those lifters out super quick
Can't you use a dail gauge to measure exactly how much lift you're getting from that cam lobe?
Yes that could have been done without engine running to see decreased lift. Good idea
Where are you located
I must be dense, but since the cam is just opening/closing a valve and even when in this failed condition it is opening/closing valve just not as high lift as should be, how does the miss show up on a scan tool? I thought scan tools interfaced with ECM and electronics, like an injector or coil, how does it show a miss from the lowered compression (I assume)? Thanks.
not just any scan tool. A good scan tool with a misfire graphic. Yes a low lift cam lobe that is wearing down will cause a misfire at idle.
Dealing with the same problem have a beautiful loaded trimmed 06 with 2200 on it and it sounds like hell
Just swaped a 6.0 into my lifted tahoe...sounded shitty. Shop pulled the motor, rebuilt it and still ticking. I'm 2500 down so far and its been in the shop 3 months now
My ls2 makes a knocking sound only during cold starts and goes away after a minute when it warms up
I’m pretty sure this is the problem with my truck. Has 285k miles on it. Do you know how much a shop would charge for this repair?
4k-14k depends how far along and bad it got. once one cyclinder goes down at the point the cam is getting ruined for that lifter, it works on wrecking the next firing cylinder. my 2013 lifter intake collapsed and it deactivated the firing of that #4 cyclinder, and i'm less spalled than this but the crazy amount of carbon build up on the cylinder right behind it #6 is like powder lead and burned oil combined. this is passenger side, and i have yet to take the head off the driver side due to the rain the last two days.
Hi i have some problems with my 5.3 call i call you please i need a little bit of help
Cost for a complete rebuild?
new engine is $41k 14k to repair this issue, rebuild will be some where inbetween?
Just get a dial indicator and measure the lift vs a known good cylinder barring the engine over by hand no need to remove the rockers and do all that
I had the same problem,on number 7 cylinder, I taking everything apart.the lifters worm down and cam.I tell everyone having this issue, please replace cam , lifters,time chain and oil pump,Mt truck is 2008 Silverado 4.8 will 250000 miles.Im back rolling now
No check engine light? I have a chirping noise once the engine is warm. It's been like that for a year and I just recently past a Echeck. This is on a L77 6.0 I swear it's coming from the Bell Housing. The shop told me today their not sure what but it's coming from my motor. No check engine light at all.
I’m having the same problem I guess. I have an LQ4 but it sounds kinda like a diesel and the noise seems to be coming from the bell housing. I’ve already inspected the flex plate and it’s fine. Bolts are torqued too. 🤷♂️
@@haydenf1353 I guess it's time for a cam and lifter change
Would’nt it be equally or less expensive, to just put a new engine in the truck ?
new motor is $41K
@@aprilgeneric8027 , $ 41, ooo ? Are you serious ?
😂😂😂 guess v8 is the only motor u can run on 7 c
Made in china cams??
gm everything is made in china, buicks were closed in america to move the whole production line to china, just like rangers were shut down in america and moved to mexico.