2001 5.3 fouling driver side plugs
05-11-2024, 08:06 AM
#1
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2001 5.3 fouling driver side plugs 2001 5.3 truck motor swaped in 1979 z28, the driver side is running rich and fouling plugs at cruising speed. I have replaced injectors, plugs and wires, added grounds to my coil packs still same results. The maf has been deleted and I am running o2 sensors. Stock motor and it ran fine in the donor truck. I am lost any help would be great. Thank you
05-11-2024, 10:59 PM
#2
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Have you scanned for codes?
If you have a decent scanner, check for O2 sensor voltages, STFT and LTFT.
Or swap O2 sensors bank to bank.
I'm think a bad O2 sensor on the too-rich bank which always reports lean. The STFT and LTFT would then read high positive values.
If you have a decent scanner, check for O2 sensor voltages, STFT and LTFT.
Or swap O2 sensors bank to bank.
I'm think a bad O2 sensor on the too-rich bank which always reports lean. The STFT and LTFT would then read high positive values.
05-12-2024, 01:59 AM
#3
TECH Apprentice
Please describe in more detail what "grounds to coil packs" means ?
Coils are powered by full positive battery voltage from ignition switched power. COILs are "grounded" through ECM pins..
.
My bet is on a bad O2 sensor, wire connector TO O2 sensor, or a few broken off exhaust manifold bolts allowing extra AIR in to exhaust, screwing up trims
Last edited by Full Power; 05-12-2024 at 02:02 AM. Reason: extra
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