It's is the valve cover but you don't have to buy a new one. Just take the valve cover off and drill more drain holes for the oil to return and clean the pcv with break cleaner or engine degreaser and that will solve the problem providing you don't have a bad coil or wire
@@steemo1385 mine was a spun lifter on cylinder 4, so I'm getting rid of the AFM, I purchased the AFM/ DOD DELETE KIT from AMS RACING, and doing it myself, 5 repair shops wanted 5,000 plus to do the delete kit, I was like nope, do it my self, I already had the valve covers, and intake manifold off, so not much more to remove to get to the lifters and camshaft.
I changed valve cover and stopped oil consumption., The way the new one at aftermarket is built has a different engineering which doesn’t keep oil from burning that’s what I was told. Turned out that I was still burning oil or losing oil and I couldn’t find out where it was coming from until it was put out on a lift and found out that my rear main seal needed to be replaced I haven’t replaced it as of yet what I did was use blue devil rear main seal sealer. That thing worked magic and I am no longer leaking.
Really enjoyed your video. Taught me a lot. I was thinking that this problem was my lifter. I have a 2014 Yukon XL 5.3L V8 SLT. I have a misfire on the1st and 7th cylinder so I replaced all the spark plugs and wires and coil on the 7th cylinder and that made it run a little better for a while and then it had another misfire on the 7th cylinder again after driving it for a while. I don't have the tool to check the compression yet on the cylinders yet. The vehicle runs good until we stop at a light and the idle is real rough. I hope it's not a lifter but I don't want to continue throwing parts at it either. I guess it is what it is when it come to the vehicle. What are your thoughts on my problem?
I had that issue before but it was blowing blue smoke just a start up but not after I replaced it but I haven't had that issue in my wife's tahoe until the misfire so does it make a difference if its drivers side or passengers side valve cover
Hi , thank you for sharing your problem and how to fix it I searched and I found the problem was in this TECHNICAL report from GM Service Bulletin File in Section: 06 - Engine Bulletin No.: 10-06-01-008F Date: October, 2012 TECHNICAL Subject: Engine Oil Consumption on Aluminum Block/Iron Block Engines with Active Fuel Management (AFM) (Install AFM Oil Deflector and Clean Carbon from Cylinder and/or Install Updated Valve Cover) Models: 2007-2011 Cadillac Escalade Models 2007-2011 Chevrolet Avalanche, Silverado 1500, Suburban, Tahoe 2010-2011 Chevrolet Camaro 2007-2011 GMC Sierra 1500, Sierra Denali, Yukon Models 2008-2009 Pontiac G8 GT Built Prior to February 1, 2011 (Updated Valve Cover) and October 2010 (AFM Shield) Equipped with Any of the Following Engines: - Aluminum Block V8 Engine with Active Fuel Management (AFM) (RPOs L94, LZ1, L99, LC9, LH6, L76, LFA, L92) - Iron Block V8 Engine with Active Fuel Management (AFM) (RPOs LMG, LY5) - Hybrid Engine (RPO LFA - Only Applies to Hybrid Models Built July 7, 2009 - February 1, 2011 - Prior Builds Not Cast For AFM Valve) Attention: This bulletin does not apply to the Buick Rainier, Chevrolet TrailBlazer and GMC Envoy equipped with LH6 due to a different design oil pan and AFM pressure relief valve. read more in the link static.nhtsa.gov/odi/tsbs/2012/SB-10062524-7690.pdf
Same this happen with my cheverlet shubarban and i did the same things u tell plugs change etc etc but no progress still missing then finally i get the main resson behind probleme is oil leakage now we are going through this
Isn’t it only the seal around the spark plug hole, I think you could’ve changed that without necessarily changing the whole valve cover? I had the same prob on a Honda and it had removable o-rings on the inside of the valve cover
Well, there's an update with the valve cover. There's an issue near the pcv valve where oil works it's way into. The updated valve cover reduces the oil getting kicked up in through the pcv valve. Also the pcv valve in these are hollow.
i have a slight rough idel live in gulf shores had plug wires changed any advise has 111k miles 2011 silverado put injuctor cleaner in paid 30.00 for cleaner
I've got a 2004 cadillac escalade. The truck runs fine for a few miles then it starts to misfire. I already replaced the trotle body and the fuel pump. Gona have a mechanic replace them valve covers and hope this will resolve my issue. Any ideas?
Valve cover = misfire? + "If it's not that, you're gunna need an engine replacement" ? I hope no one watches this video and starts feeling "informed" or thinks they have a solid diagnostic direction with which to pursue a fix. Neither of the two previous statements by the mechanic are valid (in the context presented, at least.) Maybe you mean valve cover 'gasket'? Even so, if you considered this to be an "honest mechanic", I feel for ya. There are literally dozens of things (at least) an honest mechanic would need to look at in order to establish a strong/valid case for engine replacement. Sure, oil leaks are generally not a good thing - especially on the spark plug/plug boot. Something isn't right in the way the mechanic explained it to ya. Or, they're hiding something. Something else had to have been done/wiggled/replaced/connected/etc. But alas - if it's working...it's working. Cheers.
Same happen to mine and I changed the valve cover on PC side and fixed the problem. The wheep hole is to small GM fucked up as usual and had to make it bigger to allow balanced flow.
Hello Sir how are you? About how much did you pay? I may be purchasing 1 from a lady who is having this issue. My cousin is going to give me all the details when he comes from out of town. I don’t even know what year it is yet. We just had a vague conversation.
Valve covers aint going to fix the proplem unless the pcv valve that its built on it its bad..when there is miss fire as a tech there is alot of stuff to look at ..compression test,injector pulse valve liftter noises..ignition coil etc..
Those engine DOES NOT HAVE PCV Valve The problem is with GM design where the pCV lings goes into the valve cover is too close to the drain hole making the engine such oil the new corrected design the vacuumed pick up line is at the other end of the vavle cover and the oil in line will drain back into the cylinder head instead of going into the intake!
lol im not a certified mechanic and im not hating what you said but i dont know if this is a prank but valve cover aint got nothing to do with the misfire because its only covering the rocker arms and theres barely even any oil in there.
Beyond false due to a engine needing 3 things to work. Fuel, Spark and Air The valve cover has a PCV valve in it for the air, to much or to less will cause it to not combust correctly therefore causing a misfire. You got the word " Cover " to much in your head.
Sure I believe your confused or mistaken.. sounds like the intake gasket was bad and you got it confused with the valve cover ... I'm pretty positive you are anyway... thanks
Nah the pcv's are notoriously problematic on these, the only thing is you won't have any idea to diagnose it (like several garages I know of) unless you have experienced it and someone tells you.
@@BigRob8161 did you get it fixed, my 2008 Avalanche Is misfiring on cylinder 4,changed alternator, plugs, wires, coil pack, and throttle position sensor. Still misfiring cylinder 4 🤬, compression test is 160
@@pattyleonard1045 nah I didn't I left it alone I'm trying to sell the mf but I believe its my fuel injectors, kicking out decent amount of furl smell like smoke from tailpipe
Please help, I have a 2008 Chevy avalanche LT, 5.3 V8, I have a misfire cylinder 4, I cleaned the injectors they are all working,, new wires, plugs, new coils, and alternator, compression test is 160.
@@invismask yes, it's a spun lifter, I bought an endoscope and looked down the oil tower, thanks to Charles from crazed performance repair here on you tube, Charles helped me diagnose the problem, a spun lifter. I'm not going to replace the spun lifter, So I ordered the AFM/DOD DELETE KIT FROM AMS RACING.
@@pattyleonard1045 oh ok. Mine is misfiring on cyl 6 but no engine light yet. Code reader said cyl 6. Its running rough but I have pretty new coils, plugs and wires. I'm thinking fuel injector or lifter. Maybe I'll get lucky and its a bad coil. I did put in cheap aftermarket ones last year but I would think it would last longer. That delete kit looks expensive! I won't have this tahoe after 2022 so I'm looking for a quick fix.
@@invismask switch coil packs 6 and 4,and see if you misfire follows the coil pack to cylinder 4, if you still have a misfire on cylinder 6, clean your injector to cylinder 6, it's easy to pull the injector out, I used a 9 volt battery with alligator clips, made a hose to connect to a can of carburetor cleaner and the other side to the injector, and then tapped on one end of the battery with the clip to open and close the injector as I sprayed the carburetor cleaner, I wish we could add pictures on this. You can also find a RU-vid video on how to clean your injectors this way. I contacted 5 repair shops here in Arizona, and they wanted $5,000 to 5,500 to do the dod delete kit. So I decided, I was going to do it myself. The kit was only 579.00 but I paid $799 because I purchased the GM performance lifters.
@@pattyleonard1045 ok today I did switch them with 4 and 6 and the problem went completely away. Very odd, no error codes and idles smooth now. One weird thing, as it first was idling I got a message on the screen that said something about service electrical system. It flashed and I never saw it again. It didn;t throw a code. After that, no problems. I drove it a few miles and it did fine. So at least I know its not the lifter or a piston problem. But I don't trust that it just went away magically either. These coils, spark plugs and wires are only a year old. I'm going to run some fuel injector cleaner thru tank of gas. I'll see if the error comes up again but at least I know if it now says cylinder 4 then its coil or wire. I have seen the fuel injector cleaner trick you mentioned. Never done it but I know how it works.
Just a FYI. They lied to you I believe. You had a air leak on the hose to cylinder 5 area. I just fixed one and the other day same issue, maybe? Maybe not but 95% of the time it’s the little hose both sides also one in rear.
I have 08 Tahoe 4.8l I replaced spark plugs, wires,coil packs,fuel injectors, o2 sensors I can’t find the reason it’s misfire at #4 only I’ve diagnosed, researched,asked mechanics they all have different answers. I cannot find the reason. I have a lean code for side and misfire #4 PLEASE HELP
I hate to say it might just be your lifters smh... I changed all 8 lifters, all coils, all all 8 injectors 02 sensor, purge valve, canister and I'm getting the same damn things but I didnt change the wires, and plus so hopefully that's it
I'm having a misfire on cyl. 4 on my 08 Suburban, changed the plug, the coil, and just changed the injector.. still misfiring. Did you find out anything on yours? I'm shooting in the dark 😂
@@baileymorse5087 No I ended up having to Replace my engine.. I had an injector stick open and it washed out my cylinder wallso. I lost compression on number 7.
mine also is rough idling when coming on to stop light, but when i step on it it sema to have power and you wouldn’t notice that it has a misfire. please help me why it does that they said its the lifter
@@alexquezada510 could be injectors, I replaced all mine. My avalanche has an afm (active fuel management system) so my issue is a failing afm lifter. I use atf a cap full of it every time I do an oil change, every now and then I’ll use more just before an oil change. It helps, but the lifters tend to fail especially after 200k miles.
