2020 6.2L: misfires, lifter issues and engine replacement - SOLVED

[persistent]

Thanks for the update and advice on testing compression first. A year of dealing with that issue is a long lesson to learn.

hah, i'm on month 4 of repairs, but i'm just fixing up the last bits now (dead steering angle sensor and related dtcs).

 

[tooleyondeck]

hah, i'm on month 4 of repairs, but i'm just fixing up the last bits now (dead steering angle sensor and related dtcs).

That's crazy for it being such a new vehicle. I am in the market for an 18-20 6.2/10spd myself, so experiences like these are beneficial in my search/decision making.

 

[lt1gmc]

Correct, compression and leakdown is important if you have already went thru electrical/fuel injector issues. My #3 non afm cyl misfire after all the above test AND Compression (235 psi, 2% leakdown) ended up being a bad lifter and cam. Lifter had over .035" worn off intake roller with damage to cam lobe as well. Enough to allow decent leakdown and compression results, but not enough valve lift and duration which resulted in a miss at idle thru about 1800 rpm. Who woulda thought? And a non-afm cylinder to boot.