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Old 12-28-2002, 07:21 PM   #1
imprezive
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Default Misfires dangerous?

I've got Cobb cams, intake, headers
And recently I've been trowing misfire codes and my idle is rough on a cold start. Do misfires harm the engine?
Also my timing belt has never been changed (40,000 miles) could that be part of the problem? Any other ideas that are cheap?
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Old 12-28-2002, 07:25 PM   #2
munkis
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misfires really dont harm the engine, more the cats, if its a ignition misfire and the raw fuel get dumped into the cats, it will cause the cats to fail.

does your ce light flash? If it does that would be an idication of a ignition system misfire as described above.

what cams do you have? street or spicy? You should contact cobb and see what they say, I know cels are common with the spicy cams as well as a lumpy idle.

Jay
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Old 12-28-2002, 07:30 PM   #3
imprezive
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To be more specific, It does not flash.....and if I do a ECU reset it may stay off for a couple of days.
I have the "mild" cams. I have I had them for a bout 7k I had the valve lash reset about 2k ago. I also had the spark plugs changed recently. And I've started using premium fuel. I don't know if any of these are actual contributing factors but I just wanted to "lay it all out there"
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Old 12-28-2002, 07:38 PM   #4
munkis
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it may not even be related to the cams/heads, do you know what exact codes you are getting?

I would still contact cobb to see what they say.
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Old 12-29-2002, 01:09 AM   #5
imprezive
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I don't know the numbers but it was cylinders # 2,3 and 4
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Old 12-29-2002, 02:13 AM   #6
dcoty
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I had misfires on 2,3,4 also with my spicy cams and heads etc, but it wasn't anything major to worry about I was told by lachute, I used to have the mild cams and that never happend to me, the only thing that made that happen when I had the mild cams was a faulty coil pack, go get it scanned at the dealer and speak to the tech to get exactly what is going on. I also had a flashing chack engine witht he spicy cams and heads when I started in below zero weather, but tuning with the Unichip fixed that.

PS: My cat is now shot and rattles I was running very rich before I got it tuned.

Dan
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Old 12-29-2002, 02:17 AM   #7
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Dan, what do you mean by "rattle" - a metallic resonance to the exhaust note? I'm asking because the Random hi-flow cat I bought from Cobb on Ebay is hella noisy, and they made a point to mention "no warranty"...I think I got sold a dud. The thing sounded like a chainsaw from the minute I fired it up. Not to mention my CEL...
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Old 12-29-2002, 08:29 AM   #8
impreza2002
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Check your spark plug wires!
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Old 12-30-2002, 03:18 AM   #9
imprezive
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How do I check spark plug wires? stick'em to my tounge?
I can't take it to the dealership. The only close dealership will rape me. they wanted $60 just to plug it in and read the codes.
PS how do i "check" the coil pack?
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Old 12-30-2002, 01:59 PM   #10
altibaby
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Glad I'm not alone. Misfires on 2,3,4.
Almost the same set up: Cobb street cams/intake, Brullen header/exhaust. I went to dealer 5 times already & they checked my spark plug; spark plug wires; coil pack & found nothing was wrong.
I'm waitting to get my ECU remapped to see if that can fix the problem...

Benjamin
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Old 12-30-2002, 02:40 PM   #11
NYCshopper
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Quote:
Originally posted by imprezive
How do I check spark plug wires? stick'em to my tounge?
I can't take it to the dealership. The only close dealership will rape me. they wanted $60 just to plug it in and read the codes.
PS how do i "check" the coil pack?
you should be able to take it to any Autozone www.autozone.com
and they can pull the codes for free
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Old 12-30-2002, 06:26 PM   #12
imprezive
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I took it to autozone. That's how I know it misfired on #2,3,4
But it doesnt' tell me the cause.
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Old 01-01-2003, 03:31 AM   #13
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bump
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Old 01-03-2003, 04:52 PM   #14
imprezive
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bump
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Old 01-07-2003, 06:59 AM   #15
imprezive
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bump
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Old 01-07-2003, 04:09 PM   #16
BlueTDimly
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Default Try searching...

There is a lot of information on coil pack/plug wire gone bad diagnosis, for example this thread:
http://forums.nasioc.com/forums/show...ight=coil+pack

or this one...
http://forums.nasioc.com/forums/show...ight=coil+pack

... etc. Good luck....
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