Also if the thermostat is stuck partially open the engine takes too long to get to operating temp. This causes the PCM to keep adding fuel because the engine is cold. Then once it gets to temp the adaptives are too far out to correct and it continues to run rich.


"Follow me the wise man said, but he walked behind"


'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.