afm

  1. H

    1000 miles from home dead 2022 Denali

    So, took first vacation in 5 years with the Family, 1000 miles from home and my 2022 Yukon Denali 6.2 with 27000 on it starts ticking the day after I arrive at my destination. Called local GMC Cadillac dealer, service guys says it sounds like the lifter issue due to afm , they got me in right...
  2. O

    What can be done?

    So, I have a 2018 Escalade ESV that is under warranty with just under 60k miles. After having multiple issues with the car battery going dead, I started it one late September day and it began to misfire. The vehicle was taken to a trusted mechanic who found the problem to be with bank 1 and...
  3. J

    2008 Tahoe 5.3L Flex P0300 Help

    I could use some help from the group. I’m getting the P0300 misfire code with a rough idle and seems to be dumping fuel in the right bank. Ive done a significant amount of work with no results. - pulled heads and replaced AFM lifters and trays. Old lifters showed no damage. New valve seals and...
  4. Printworthy

    Buying a 2020 Yukon with L83 5.3L EcoTec - Should I worry about AFM Lifter Failure

    Hi Everyone: Have a deposit on a used 2020 Yukon SLT and just discovered the AFM Lifter Issue online. I cannot figure out if the Service Builletins include the 2020 year or just 2021 L82. Lot's of stories about older Sierras and Silverados but can't narrow it down. Should I back out and look for...
  5. iboughtatahoe23

    Rattle/grinding noise at 25-35 mph, mechanic told me AFM and lifters need to be changed.

    2014 Tahoe 167k miles. I’ve posted one thread about this recently that seems to have gone dead. So I’m making a new one. Noise I’m having will usually happen from 25-35, mph when i accelerate around those speeds lightly. It seems to only happen in v4 mode and then when it “jerks” into v8 mode...
  6. Dustin Jackson

    AFM Delete and California Smog

    Last summer I mechanically removed the AFM from my motor and used Black Bear to tune out the AFM from the computer but I haven’t actually had to smog it yet but I assume it will be next year or so. I took it to my smog guy and told him what I had done to my tahoe (he’s a Chevy guy and is aware...
  7. ron81

    Which engine Oil to use ? no dod delete yet, just using OBD device to keep V8

    Hello there ! Hope you all are rocking well:) I have few questions to clarify and suggestions needed : Recently brought the Yukon and had to do transmission rebuild :( now worried for lifters: 2018 Yukon XL SLT 5.3L 95K miles No DOD delete yet, recently started using OBD device to keep V8...
    • ron81
    • Thread
    • afm obd afm disabler oil brand oil change protect lifters
    • Replies: 10
    • Forum: Engine & Drivetrain
  8. B

    new here but not new to gms. need some info on afm yukon 07 . thanks

    got problems with a 07 yukon
  9. ProjectLT

    WHAT OIL PUMP AFTER AFM/VVT DELETE?

    Doing an AFM and VVT delete on my 2011 Tahoe LT (5.3). Going with a BTR Stage 2 cam. Going to plug the relief valve in the oil pan. While the engine is out I want to go ahead and install a new oil pump and put a new o-ring on the pickup tube. I’ve decided I want to go with a Melling pump but I’m...
  10. S

    Diablo i3 Platinum - AFM disable - really working?

    Hey all, just purchased a Diablo i3 Platinum mainly for turning off AFM but maybe a good tune as well. Anyway, pushed the 87 Octane tune to my 2017 Tahoe, and also disabled AFM. After taking it for a ride, the Tahoe is still showing it switched from 8 to 4 cylinders. Talked with the tech who...
  11. Dustin Jackson

    AFM Delete Double Checking

    Hello Guys I am in the process of ordering all the parts I will need in order to complete my AFM delete on my 08 5.3 but I have questions about the oil pump and pressure relief valve situation. Here is a list of the parts I have ordered so far: LS2 Lifter Trays LS2 Chain Dampener (Recommend...
  12. MagicMike

    2013 AFM Failure -> Delete Kit advice

    My 2013 Tahoe, 5.3L, has the AFM Lifter failure (Cylinder #3, P300 and intermittent P303 errors from the OBDII). On top of the noise, the transmission is shifting hard now. Took it to shop and they confirmed the issues. I'm going to go the AFM delete route and get it back up and running...
  13. B

    Sanity And Parts Check

    Hi All, I apologize in advance as I am sure this has been beaten to death already. I have been through the forum and it appears that the threads are fairly old, so I was hoping to get a sanity check in 2021. I have a 2008 Tahoe LTZ VIN 0. Passenger side head gasket is blown I think between 4 &...
  14. Kpwweb

    Lifter issues - What Oil Did You Use?

    For those that had or have lifter issues (the dreaded collapsed lifter) what oil and filter did you use before the problem? What oil and filter do you use now? I am wondering after a comment made by the dealership mechanic as my truck was in the shop for a #6 collapsed lifter. I have sworn by...
  15. Chris Z

    Intermittent lifter tick on cold start

    ‘09 SSV. Has an occasional loud ticking on cold start. Usually goes away in a matter of seconds. Sounds like a collapsed lifter that is stubborn to get pumped back up. Purchased a Range AFM disabler today. I’m hoping if that lifter stays pumped up it won’t get worse. Anybody have good...
  16. B

    2016 Denali/6.2 long term reliability

    I couldn’t find any threads for this so I started a new one. I’m almost at 85k mile on a ‘16 Denali. What’s the consensus for the drivetrain, long term wise. I know there are reports of spring and lifter failures on the engine, but how common is it? so far I’ve been through the standard: AC...
  17. smokymtn65

    07 Suburban rough idle P0304 code afm delete

    So i thought I would start my own thread here. Hopefully for some help to figure out what is going on. As title says Did a delete, using a BTR stage 2 truck cam. And it has been tuned. I have a rough idle and will throw code P0304 after time, Today I drove it in to work 50 miles no code had a...
  18. tjmrider

    AFM Delete - 5.3L LMG

    Looking to do a AFM delete kit (DoD Delete) on my 07 tahoe. Looking for suggestions for anyone that has done this delete in the past and has any suggestions. I can find kits from places like Texas performance, but I feel like there is more to the kit than what they have to offer for parts. For...
  19. Peter Tremonti

    AFM Issues / Misfire

    I finally got the the oxygen sensor holes plugged today. New front sensors, wrong rears arrived but still plugged the holes nicely (Only 1 sensor came with the vehicle when I bought it...) Now that the front sensors are reading properly, the P0300 fault is showing up along with the P0315 (P0315...
  20. O

    08 Tahoe ltz afm or fuel pump issues???!?

    hello I picked up my Tahoe awhile back and had all kinds of issues. Replaced the ecm and wiring harness now all is well except when it switches from v8 to v4 mode it shakes and misfires pretty bad until the check engine comes on and flashes. The check engine will turn off after 15-30 seconds and...
  21. O

    08 Tahoe ltz afm or fuel issues??!?

    hello I picked up my Tahoe awhile back and had all kinds of issues. Replaced the ecm and wiring harness now all is well except when it switches from v8 to v4 mode it shakes and misfires pretty bad until the check engine comes on and flashes. The check engine will turn off after 15-30 seconds and...

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