I had a evap sol go bad a couple weeks ago. . I replaced it.
While watching live data at the time I saw I had some cylinder 1 misfires. No MIL but on live data I could see ~50 at startup and about 70 more after an hour a drive all on cyl 1.
I also noticed that the LTFT were -5% to -15% always.
And that bank 2 is always -3% richer than bank 1. Even across all driving modes, city, highway, etc it’s always 3% richer than bank 1.
So I start with the misfire. Swapped coil, plug, and plug wires from 1 to 3. No follow. I got an Injector reseal kit, pulled the D/s injector rail, swapped #1 and #3 injectors, resealed them, reinstalled and retested.
The misfire followed to 3. So I ordered and replaced all 8 injectors, spark plugs, and plug wires. Also replaced the 1 time use fuel pipes under the intake manifold.
Injectors that were in the truck since new were
Part # 12668390.
I replaced them with # 12742701
Got from RockAuto. Pretty certain they’re genuine and the correct ones. I called a friend at a parts store who told me “the 12742701 were the correct superseded part # for the originals I was replacing”.
So started truck after replacing all that and it’s running -15 - -30 LTFTs. I reset the fuel trims with GDS2 and drove it for a 60 miles trip each way. There have been no changes in the LTFTs.
I checked if the HPFP was leaking into the crankcase. I removed the pvc and watched the trims. No difference.
I checked the alcohol content and it was at 10%
I’m out of ideas here. Truck seems to run great. Just always rich on the fuel trims.
Anyone with any help or ideas would be greatly appreciated.
I ran an injector balance test just for the heck of it and it came back this. I’m confused.
I have gds2 and some other diag tools if anyone knows of anything I should test next.
