misfire ?

y2kGT · 10-05-2008, 12:44 PM

I have a slight misfire when at idle but only when its cold. If i turn the ac on even when its cold it goes away. Any ideas?

thatdavidkid · 10-05-2008, 01:06 PM

time for a tune up? which car? how many miles? mods to the ignition system? done a compression test?

y2kGT · 10-05-2008, 01:45 PM

new motor with about 5k miles. its an 02 motor in a 2000. compression is fine new everything. no ignition system mods. you think maybe a coil starting to go bad?

thatdavidkid · 10-05-2008, 02:14 PM

it's possible, but it could also be 2039875934857 other things... no check engine light yet? i'd figure out how to get a power ballance test done... with the computer at work it can tell you if you have even a slight misfire and in which cylinder it is.. that would be a good start... if it's not in just one or two cylinders, i wouldnt bother looking at the coils any more

stangfreak · 10-05-2008, 02:31 PM

Check your plugs to. 02 PI motors are bad for blowing plugs. Mine sounded like a small misfire, didn't even show on scan tools... then it blew through my coil.

y2kGT · 10-05-2008, 02:37 PM

Quote:

Originally Posted by stangfreak

Check your plugs to. 02 PI motors are bad for blowing plugs. Mine sounded like a small misfire, didn't even show on scan tools... then it blew through my coil.

yea thats happened to my friends 02 four times! I will probably have Strictly check it when they change my trans.

Bigdrumma22 · 10-05-2008, 02:42 PM

My misfire occurred in cylinder 3 due to some moisture in the plug tube. There was no engine light for about a week prior to me taking it to get checked out. I took it to Jody (96greengt), and his shop had a genesis scanner in which he was able to clearly see the problem and identified it to be cylinder 3, even without the engine light being activated. He took off the coil and plug, checked them out, put them back, cleaned off the small amount of moisture that had built up in the tube and on the coil, and all was good. So, it will be easiest if you can identify the problem cylinder first. If you know someone who works at a shop, they should have a scanner similar that will be able to pinpoint something like this.

thatdavidkid · 10-05-2008, 02:46 PM

Quote:

Originally Posted by Bigdrumma22

My misfire occurred in cylinder 3 due to some moisture in the plug tube. There was no engine light for about a week prior to me taking it to get checked out. I took it to Jody (96greengt), and his shop had a genesis scanner in which he was able to clearly see the problem and identified it to be cylinder 3, even without the engine light being activated. He took off the coil and plug, checked them out, put them back, cleaned off the small amount of moisture that had built up in the tube and on the coil, and all was good. So, it will be easiest if you can identify the problem cylinder first. If you know someone who works at a shop, they should have a scanner similar that will be able to pinpoint something like this.

exactly.. i'm not too familiar with genesis, but i know they can do it, i know the ids at work has a power ballance read out

tiptone · 10-09-2008, 11:19 PM

With so little information, I've still got $5 on a COP.

10-05-2008, 12:44 PM	#1
y2kGT Is that a mach? Join Date: Jul 2007 Location: Houston Posts: 668 Trader Rating: (0)	misfire ? I have a slight misfire when at idle but only when its cold. If i turn the ac on even when its cold it goes away. Any ideas? __________________ Y2kGT-Just another 4-6 1995GTVERT-DD 1989LXVERT-waiting to be reborn!

10-05-2008, 01:06 PM	#2
thatdavidkid looks mean, workin' on the fast Join Date: Oct 2006 Location: Denton Posts: 3,903 Trader Rating: (1)	time for a tune up? which car? how many miles? mods to the ignition system? done a compression test? __________________ 1991 lx coupe t-5 swap, billit quadrant, upr firewall adjuster, steeda tri-ax, custom jb tool and fab one off subframe connectors, 8.8 w/posi and 4.10's with 5 lug axles, tubular upper control arms, southside lowers, and pbr twin piston front calipers with "snowflake" wheels

10-05-2008, 01:45 PM	#3
y2kGT Is that a mach? Join Date: Jul 2007 Location: Houston Posts: 668 Trader Rating: (0)	new motor with about 5k miles. its an 02 motor in a 2000. compression is fine new everything. no ignition system mods. you think maybe a coil starting to go bad? __________________ Y2kGT-Just another 4-6 1995GTVERT-DD 1989LXVERT-waiting to be reborn!

10-05-2008, 02:14 PM	#4
thatdavidkid looks mean, workin' on the fast Join Date: Oct 2006 Location: Denton Posts: 3,903 Trader Rating: (1)	it's possible, but it could also be 2039875934857 other things... no check engine light yet? i'd figure out how to get a power ballance test done... with the computer at work it can tell you if you have even a slight misfire and in which cylinder it is.. that would be a good start... if it's not in just one or two cylinders, i wouldnt bother looking at the coils any more __________________ 1991 lx coupe t-5 swap, billit quadrant, upr firewall adjuster, steeda tri-ax, custom jb tool and fab one off subframe connectors, 8.8 w/posi and 4.10's with 5 lug axles, tubular upper control arms, southside lowers, and pbr twin piston front calipers with "snowflake" wheels

10-05-2008, 02:31 PM	#5
stangfreak It's LOUD but YOU looked! Join Date: Jan 2008 Location: San Antonio Posts: 691 Trader Rating: (1)	Check your plugs to. 02 PI motors are bad for blowing plugs. Mine sounded like a small misfire, didn't even show on scan tools... then it blew through my coil. __________________ Deep thought... Why do they call it an asteroid when it's outside the hemisphere, but call it a hemorrhoid when it's in your butt?

10-05-2008, 02:42 PM	#7
Bigdrumma22 Evil Angel Join Date: Apr 2007 Location: San Antonio, TX Posts: 1,418 Trader Rating: (7)	My misfire occurred in cylinder 3 due to some moisture in the plug tube. There was no engine light for about a week prior to me taking it to get checked out. I took it to Jody (96greengt), and his shop had a genesis scanner in which he was able to clearly see the problem and identified it to be cylinder 3, even without the engine light being activated. He took off the coil and plug, checked them out, put them back, cleaned off the small amount of moisture that had built up in the tube and on the coil, and all was good. So, it will be easiest if you can identify the problem cylinder first. If you know someone who works at a shop, they should have a scanner similar that will be able to pinpoint something like this. __________________ 2002 Mustang GT, 271hp/306tq on 87 CMR Tune, Roush short throw rally style shifter, King Cobra Clutch, Roush CAI, C&L Plenum, BBK/Roush 75mm T/B, Kooks L/Ts w/catted X, Bassani Cat-back, Eibach Pro-kit Springs, Energy Suspension bushings, KYB AGX's, Hotchkis C/C plates, UPR ProStreet rear control arms, Brembo Drilled/Hawk pads, BFG's, Dual Halo Projector 8k HIDs, Kenwood: KDC-X790, KAC-9102D, KAC-8402; Infinity: 6810CS, 6812CF; Orion: P series subs all powered by Optima My car http://www.cardomain.com/ride/2628572 My truck http://www.cardomain.com/ride/2206751

10-09-2008, 11:19 PM	#9
tiptone Registered User Join Date: Oct 2007 Location: Montgomery Posts: 23 Trader Rating: (0)	With so little information, I've still got $5 on a COP.

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