LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Missfire,tried everything!

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Old 11-08-2003, 07:28 PM
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Join Date: Mar 2003
Location: conshohocken
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Missfire,tried everything!

well not everything but heres what i did.joe spena has been coming over and i think the problem is starting to stump him.until we can get it scanned heres what we ve done.
fuel pressure=perfect
new ngk tr55 plugs
new taylor otvc wires
new opti
good ICM
accel coil thats a couple years old.

ok now heres some side notes:i have one backed out header bolt on the pass side.my o2 sensors are a couple years old(bosch).before i tore it down for the opti swap in the summer it was missfiring.i put a new opti in,starts missfiring less than a week later take it to the shop(no ses)but it throws a dtc16 code low res to opti.the code wasnt active b.c the car would start fine and that code active makes it so the car doesnt start.take the pcm out,take it to pcmforless(needed it programmed anyway)throw it back in and still the problem.i dunno if im throwing any codes now until we can get it on the datamaster.its hard to describe the missfire but at idle its not as constant than if it was driving.at idle its every 5-10 seconds.i guess what im sayin is the more u gas it the heavier the miss happens.were thinking sticky or dirty injector,backed out header bolt could be sending bad signals to o2?any other suggestions.
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