Thread: urgent need help misfire

acdelco's, not sure exact ones, assuming stock. the plug wires are aftermarket too. the guy claimed to have had replaced them 3k ago...

Iridium or platinum?
What el cheapo wires you got?

wires are "belden edge" 7mm wires. i compared resitance between the wires on my gt and the gtp, there about the same resistance. not sure about plugs. its pouring i just got soaked checkin wires

Bill lives in Enfield CT, im sure he could diagnose it for you if you get it to him, i see you are from mass. Sounds like either the o2 sensor is out of range at wot or a bad fuel injector. is the car completely stock?

as far as i know its stock.

ideas people?

when it stops rainin..oh ..hey it has. Go check those plugs

plugs are acdelco 4 -101 i think

crappy droid pic

41-101 are iridiums. Shouldn't be a problem. Unless you pull that cylinder and see something directly shorting the tab to the center. I'v ehad that happen on a couple ATVs in the past.

so what should I do now/ where should I look for issue

Probably in Enfield CT

whatcha think? burnt valve? bad head?
should i do a compression test?

i also forgot to metion it only does it when im heavy on the throttle but when i was light just gettin up to speed i did not notice a missfire. i drove for an hour on the highway and the last like 2 miles from home i layed on it and thats when it misfired/

so i did a compression test. cylinder 6 and 3 both show 165 psi. what gives? im completely cluelesss as to where else to look

Your compression is fine.. totally normal.

I'd be looking at the coils to see if you have a weak one.

i took the coil from my gt and threw it on and it still missed

so would driving it right now be bad? im dying to put it on the road its killin me lookin at it. and i have a few people interested in the gt

Probably time to look in the cylinder with a borescope.