Common GM V8 Issues & 6.2L Truck problems 

I have hear about but haven't seen it yet personally. Do you happen to know the tsb number?

@@CrazedPerformanceRepair TSB 10-06-01-008M:

The new valve cover is included with this TSB. Purchased the valve cover from Summitt, they have stock. This Bulletin has been revised to update Warranty Information. Please discard Corporate Bulletin Number 10-06-01-008L. Condition Some customers may comment about engine oil consumption of vehicles with higher mileage (approximately 48,000 to 64,000 km (30,000 to 40,000mi) and a service engine soon light being on and/or rough running engine. Verify that the PCV system is functioning properly. If the customer understands that some oil consumption is normal and still feels the consumption level is excessive, more than 1 quart per 2000 to 3000 miles of driving, perform the service indicated in this bulletin. It is no longer necessary to have the customer return multiple times to have the usage verified. Cause This condition may be caused by two conditions. Oil pulled through the PCV system or oil spray that is discharged from the AFM pressure relief valve within the crankcase. Under most driving conditions and drive cycles, the discharged oil does not cause a problem. Under certain drive cycles (extended high engine speed operation), in combination with parts at the high end of their tolerance specification, the oil spray quantity may be more than usual, resulting in excessive deposit formation in the piston ring grooves, causing increased oil consumption and cracked or fouled spark plugs (# 1 and/or # 7). Refer to the latest version of Corporate Bulletin Number 12-06-01-001. Correction Note : When installing the updated valve cover or reinstalling a used valve cover, verify that the baffles can hold water and do not leak. If any leaks are found, seal with RTV if possible or replace the valve cover. Thoroughly clean and dry the valve cover before installation. Aluminum or Cast Iron Block - Oil in Intake Manifold - Install Updated Valve Cover on All Models Built Prior to February 1, 2011 Note : If vehicle is built after this breakpoint, it should already be equipped with this updated valve cover. 1) Old Design 2) New Design PCV pullover or an overactive lifter can cause oil to be pulled through the PCV system even at low vehicle mileage. A correctly functioning PCV system will only leave a film of oil in the intake manifold. Inspect the intake manifold to see if there is any oil puddling in the bottom. If there is you will need to replace the left valve cover. Two new left rocker arm covers have been released for trucks and vans. Technicians should replace the left rocker arm cover with GMP/N 12570427 for 2007-2008 or GMP/N 12642655 for 2009-2011. Refer to the Parts Information below for the Camaro. This rocker arm cover has a relocated PCV drain hole that prevents oil from entering the intake manifold. Refer to Valve Rocker Arm Cover Replacement - Left Side in SI. Note : These rocker covers are for specific years. The PCV orifice is different for each. The correct cover must be used or an SES light may set. Aluminum Block - Oil Getting Past Piston Rings - Free Up Piston Rings and Install AFM Shield on All Non-Hybrid Models Note : If vehicle is built outside of this breakpoint, it should already be equipped with this AFM shield or the pan does not have an AFM valve (LFA before July 7, 2009). To correct this condition, install an AFM shield, perform the piston cleaning procedure as described in this document and install a new oil pan gasket per the procedure outlined in this document. Monitor oil consumption after this repair to ensure oil consumption has improved to acceptable levels. If this repair does not correct the condition, it may be necessary to replace all of the piston assemblies (piston and rings) with new parts. Refer to SI for repair procedure. Important : It is critical in this cleaning process that the engine/fuel injector cleaner remain in the cylinders for a minimum of 2.5 hours to fully clean the components. The cleaner solution must be removed before a maximum of three hours. 1. Remove the spark plugs and ensure that none of the pistons are at top dead center (TDC). 2. Clean the pistons by putting 118-147ml (4-5 oz) of Upper Engine and Fuel Injector Cleaner, GMP/N 88861803 (in Canada, use 88861804), in each cylinder. Allow the material to soak for at least 2.5-3.0 hours, but no more than three hours and then remove the cleaner. A suggested method of removing the cleaner is cranking the engine over. Make sure to unplug the ignition coils and fuel injector before cranking the engine over. Also make sure that the painted surfaces are covered so no damage is done. 3. Remove the oil pan. Refer to Oil Pan Replacement in SI. 4. Remove the AFM valve (1). 5. Install the new shield (1), GMP/N 12639759, and tighten the AFM valve to the oil pan to 28 N.m (20 lb ft). Important : Ensure that the engine cleaner is thoroughly removed before reinstalling the spark plugs. Failure to do so may result in a hydro-lock condition. 6. Reinstall the spark plugs. Replace the spark plugs if necessary due to full of carbon. Refer to the parts catalog. 7. Reinstall the oil pan. Refer to the Oil Pan Installation procedure in SI. Replace the oil pan gasket if necessary. Refer to the parts catalog. Replace the engine oil. 8. Re-evaluate the oil consumption. Document on the repair order. If the oil consumption is still greater than 0.946 L (1 qt) in 3,200 km (2000mi), replacement of the pistons and rings will be required.

@@CrazedPerformanceRepair I have a 2008 GMC Denali crew cab with a 6.2 L, number seven has piston slap, I also have two pushrods making the same sound as rod Knox, General Motors has really built shitty motors now. And also the 5.3, also has the same issue, collapsing pushrods.Also my truck is really clean inside and out, servicing and taking care of it.

What us the torque on the cam bolt on the 2010 vvt cam bolt

How much did all of this cost i have a 12 avalanche z71

I’m curious too.

Bingo. Plug it and get rid of the POS relief valve!

Not all 6.2 are not AFM. I bet that Denali opted out or was a 2500. Then again maybe because it's a Denali it was considered too heavy to take advantage of AFM. That's what seemed to happen to a lot of the Cadillac of that era. Both are loaded with accessories and heavy trucks/suv...

@@CrazedPerformanceRepair I’ve read that is was more of an early production decision GM made for the heavy vehicles. They weren’t sure if it would make much of a difference. Some vehicles received the hard parts but it just wasn’t turned on in the programming.

Good call leaving the system off now just keep up on the oil changes and hope what happened to this one doesn't happen.

@@CrazedPerformanceRepair I change it once a year roughly 10,000kms use Amsoil Signature series and filter plus have a catch can and cleanside separator. Crazy the crap that it catches.

@@anthonymacneil2279 Did you have lifter issues or had them replaced at dealership. That being reason for deactivating DOD?

@@albertpalos2508 No, had no issues just wanted rid of it, the truck was bought new .Heard lots of bad things about them

I'm not sure about at-205 never messed with that. If it swells gaskets like a o-ring I'd be worried about other seals in the engine like timing gover, oil pan, rear cover etc. You might end up making those separate and create a much larger leak. You most likely have an oil pan leak already, so you may as well do the o-ring. It's only a 5-hour job according to the book on 4x4 trucks. It only takes me about 3 hours tops with interruptions.

If it is a 1500 it could very likely still have AFM/DOD. How do you know for sure it doesn't have it, did you check the valley plate under the intake?

@@CrazedPerformanceRepair The L9h 6.2L engine was built without afm. It was put in the 1500 sierra and silverado as the big engine option. Only the L94 6.2 in yukon denalis and escalades had afm.

Better off with a toyota sequoia capstone or a newer Lincoln Navigator

Don’t buy a GM 2019 Denali 4x4 2 motors blew both cam bearings.

Ecotec or vortec

@@Pabloperes675 1 of each

@@PumpkinKingXXIII don’t tell me that man, i pulled the trigger on a 21 Silverado 6.2, should I back out?

I got bad luck so make your own mind up. My 2016 got stolen first of December. Insurance paid out, bought a 2021 gmc with 6.2. Two weeks later deer ran out and major damage. Been in the shop trying to get parts to fix it since. Shop has had it three months tomorrow.

@@PumpkinKingXXIII damn man sorry to hear all that.

It's considered a stretch bolt per GM, I guess in theory it could break. I guess if you've been driving it and it hasn't broke yet, I wouldn't be too concerned.

@@CrazedPerformanceRepair thank you for the reply sir, so if the bolt happened to break would the cam phaser sprocket fall off? That would be my fear is that it would fall and destroy the engine. Again thank you for your time

@@johnherrera8004 yeah most likely. Then it would bent valves at that point.

I found the vvt cam bolt can be reused one time. Original torque specs were 48 and some amount of degrees, if it is reused once then torque it at something like 45 and add some degrees but not as much. If you can remeber how much you torqued it if it is around the 45 you'll probably be just fine. Check out sdpc tech tips: dod delete faqs!

I just got a 2011 ss and it’s leaking oil

W

The second Cam Bearing is a common oil pressure loss area so be sure to replace those to. Norris cam is a great choice though. If you go to a standard volume pump then remove the release valve. That pump is going to be too high of volume for that build though. Since you added the oil squirter's but removed all the AFM vvt stuff, I would go stock high volume. That pump will just be pouring oil past the pump and pan bleed off constantly.

Probably the oil pressure sending unit. It’s a easy replacement and don’t forget to take out the screen behind it and don’t replace it!

No I don't. I have honestly only used it twice since this video too. I guess I have come up with other testing ways.

Just below 40 isnt low😂.when it gets to like 10 at idle be worried then

motown block get the best of both worlds. get the flow of a LS top end and eliminate the windage problem by using sbc 350 block.

To the nearest dealer

The owners manual also says to use premium on these 6.2 l and people still use 87 . That's probably why they're messing up. I put nothing but premium on Camaro ss

Full delete is about 20hrs. Not including machining head.

2008 6.2 doesn’t have the DOD. It’s only a VVT motor. Bunch of misinformation on the topic of the 6.2 Having DOD and what year they started. 07-09 6.2’s absolutely do not have DOD. As your comment is a year old, I assume you’ve found that out already.

It could be the camshaft bearings, but it could also be the lifters themselves. Pull the valve covers off and run the engine. If a ton of oil squirts over the fenders from the lifters pushing it up the pushrods then your lifters are junk.

New parts don't fix why the failure happened in the first place. You either lack oil pressure during activation or the plastic guide is junk and allowing the offer to rotate. If the guide is bad the camshaft and lifter roller will be too.

@@CrazedPerformanceRepair lifter are new because it had a bent rod valve Lifter Oil Manifold I tried it outside putting power on and you can't hear it activate but that also has to do with cylinder number eight

@@bikelifektm7449 it had bent pushrod? Not sure I understand that comment. Btw, I typed mine wrong. Offer was supposed to be lifter.

@@CrazedPerformanceRepair Some of the rods were bent I put them new all the way down but I took out to test AFM Lifter Manifold with a Power pro and it doesn't make the sound of activating and deactivating that also controls all the cylinders

@@CrazedPerformanceRepair bent pushrod i put it all new And it has oil pressure over 40

Did it have AFM? Did you change to a different lifter type or anything else at the same time?

I have yet to see a V6 truck in my area so I'm not sure how often they fail. I do here from the internet of them failing ever so often though.

If it does have AFM getting a tune to shut it off is best. At least until something fails and it needs a full AFM delete. I typically avoid the disabler for several reasons but for starters it much more expensive then the alternative permanent solution of someone like lt1swap.com

I purchased a 6.2 from a 08 Denali to do a swap........are you saying that it doesn't AFM and do you know if I would need to do the DOD Delete for this particular engine?

Just do it

Hi, did you ever figure out what it was? Mine is doing the same thing.

@@lazydayB2BYeah it died like a month ago. Cadillac repaired the motor 7 months prior when the AFM failed. Now this, and they won’t accept responsibility. I only use it to pick up my kids and the oil was changed 2 twice within those 7 months. I now have a 6000lb brick.

www.crazedperformancerepair.com/availible-shops

Only if it's the same generation and pickup trigger wheels on both camshaft and crankshaft. It will also need to match whether the vehicle you're putting it in had or doesn't have VVT. You also need a tune though to shut off the AFM.

Thanks appreciate it. I swapped it out for a L9H luckily it worked. Got extremely lucky

The best advice is to turn AFM off completely like I did on my 2017 with 6.2 when it left showroom floor. I also use Amsoil SS since new. No issues yet knock on wood

Not at all, that is good oil pressure. I would just shut the system off for good measure if you haven't done it already.

@@CrazedPerformanceRepair i ment to say it idles at 20 while parked and 60 wile driving around

Oh then it is low unless you are not equipped with AFM/DOD.

@@CrazedPerformanceRepair im not to sure i have a 2007 Yukon denali 6.2

I have seen these issues on even spotless well maintained engines. Every vehicle has the chance to get lucky like you did or unlucky like the maintained ones with issues. This particular one was abused though and maintenance most certainly helps a lot.

I would just shut off the AFM in the tune for now and do oil changes often, well before the oil reminder. Do the delete when something fails.

@@CrazedPerformanceRepair is the range plug in good enough instead of a tune? For now until something breaks. I have the range already and planned to run it until i have an issue.

@@edensgardenshed9622 yeah, it works most of the time. Since you already have it may as well.

Can you send the parts number because I want to do dele

Check the exhaust and catalytic convertor

If it had VVT and you went to a 3 bolt cam you have removed VVT already. This means you must change the timing cover to a non VVT cover and also turn off VVT in the tune. Make sure you have a 4x cam sprocket installed and that you get a tune put it that is specific to the modifications that you have done.

I assume you mean you have the 10355 and if so then yes you will want to remove the relief in the pan. Also prob safe to assume you have deleted the AFM system completely right?

Most likely depends on model. You can check by looking at the top of the VLOM behind and under the throttle body. You are looking for smooth cover "Non AFM" or a cover with passages "AFM equipped."

I just bought an 08. I know I can look at the timing cover to tell if it’s vvt or not. How were you able to tell if it’s DOD or not?

Check the screen under oil sender. It's not the thrust plate unless it broke somehow

Thanks, will do!!!

@@CrazedPerformanceRepair It wasn't the screen. I am going to do the DOD delete. How do you remove the cam gear/timing chain? Have you made a video for this?

@@CrazedPerformanceRepair It turned out to be the thrust plate. The built in gasket wears down and flattens out, allowing oil to slip by and go to the oil pan underneath the timing gear and, effectively bypassing the oil pump. For two weeks now, the oil pressure is normal (approx 60 psi at cold start, 40 psi at operating temp and normal operating rpm, with it dropping to just above 20 psi at idle). I would have never dreamed a part less than $30 could have caused that...

No, but they break them with AFM active that's for sure. It's mostly just the 6.2 as well and I'm not sure why.

@@CrazedPerformanceRepair mine broke cylinder 4 piston ring about 2 weeks after turning off AFM.

It was probably already fatigued and close to breaking. A ring won't get damaged from running like normal engine in a 2 week window.

There are 6.2 without it but I guess it's somehow a different lobe profile. It would be nice to look into a bit to be sure though.

@@CrazedPerformanceRepair I too have an 07 that does not have AFM DOD. However I do have an extreme oil pressure loss when at idle...it drops down to near 0...as in zero. When revved up but then it only gets to about 30 maybe. Replaced the oil pump, and no change. Also did the o-ring from the tube going down into the pan. No change. When the car warms up, while driving, I also get that clanking sound that I hear in your videos. It's intermittent however. May last for 25-30 minutes and go away for 10-15 minutes. I'm looking at doing a top end rebuild. Before I do that, I thought I would ask if you had any ideas for me to look into first. Thanks for your consideration!

@@benjaminsaveritt7047 It is most likely a lifter, I will be releasing a new video on the new issue related to your exact problem. I will release it in less than two weeks.

I have a 2009 Silverado LTZ 6.2. Bought it because it does not have AFM. Have another with a 5.3 with AFM. I put in the AFM disable in a few years back.

@@caspere.8461 oh ok. That must be the L9H. Went L92 to L9H then the L94 had afm. Good to know. Thanks.

You should suspect a sticky valve. Was it intake or exhaust?

Yes most likely

If the cam is damaged it's time to delete AFM/DOD. To upgrade cams will require a tune so you will need a way to get a custom tune. Had it been fixed right the first time the system could have been disabled rather then to continue replacing lifters. These systems fail from low oil pressure, under 27psi at the lifter during activation to be specific. It can be caused by many things. If you do the full delete and want help making sure you do the right thing feel free to contact me at my website.

You have that backwards. AFM started in cars in 05, trucks in 07 and vvt didn't get implemented heavy until at least 2010 but I believe there was some early adoption in earlier years.

I don't recall if I have video sitting on the drive or not I might but I went with ls9 I believe. Had to get a tune done though for that cam.

@@CrazedPerformanceRepair I'm currently searching for a truck/SUV and the denali's keep popping out as available so I'm tempted

I could have made a video on them too but they have phased out (or rotted out) here so I never see them anymore. They are more reliable in regards of the dumb DOD system though.

@@CrazedPerformanceRepair old chevy trucks from 88 to 98 with 4.3 or 350s all over the place in dayton xenia area..mine only has 114,000 on it but a lot have way over 250,000 ..mine is not rotted out,,,fluid film helps

Tq converter lockup not disengaging?

@@CrazedPerformanceRepair that was one possibility, convertor solenoid. So far replaced vvt mag and cam sensor to no avail. Would that be what u go after next?

Didn't have the space at the time, single stall shop things... New bigger place now though, so doing foundation and if lumber ever becomes affordable I'll increase its size even more. That old one was a tiny ass shop space for the things I do.

Cheap conventional oil.

Actually, it depends on context. Aside from the oil sump o-ring the bottom end of the engine is extremely reliable. The top end is the section that sees all the problems. This is mostly do to them adding the DOD/AFM system to their engines. Without that system they usually last 400k plus miles before needed engine repair. Most domestic vehicles today are lucky to see 200k miles without major engine repairs to the timing components. This has to do with the complex multi-camshaft engines of the modern vehicle vs lack of maintenance from the consumer at the suggested maintenance from the manufacturer.

I'm just throwing this out there,my 2012 Silverado 4x4 1500,6.2,has 170,000 miles and has been to the dealership 1 time when the transmission dipstick tube had a recall in 2012.

No

Why do you put your wife down like that?

Garbage wife 🤣