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Old 04-22-2014, 06:21 PM   #1
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Misfire

I have a misfire, it is only noticeable at idle and at a constant rev at 1700-1800 rpm. At WOT there is no sign of weakness or drop of power, i have had the miss for a very long time never had an issue and still don't have any problems. I just want to fix it. It is not throwing any codes, plugs have been changed, COPS seem to be fine. Ran sea foam, and injector cleaner through it still have it. I ran 13.6 at the track and thinking that my car may not be running at its full potential. Any help would be appreciated!
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Old 04-22-2014, 06:56 PM   #2
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Well I'm gonna subscribe to this cause I've had the same issues for a while. Have you tried tried a compression test yet?
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Old 04-22-2014, 07:39 PM   #3
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I had the same issue. It turned out to be a bad coil. I changed all the boots and springs first and no change. I bought a new coil and swapped one out then drove it for a while. It was the third one that I swapped that turned out to be bad.
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Old 04-24-2014, 11:46 AM   #4
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Same problem, turned out one of my cops had a slight tear on the boot.. swapped it out good to go. Might wanna inspect them

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Old 04-24-2014, 03:51 PM   #5
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I have the same problem, but I haven't saved up to replace the coils boots. When I replaced my intake gasket, the mechanic that let me work in his shop, told me that when you pull out the boots (or they get old) the rubber stretches and leave un-see-able holes within the boot causing the misfire. And sure enough as soon as I put it back all together, there was a slight misfire that only happens at idle. As far as I know replacing the coil packs will fix this.
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Old 04-24-2014, 05:36 PM   #6
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Well the boots and springs are less than 30 I think
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Old 04-29-2014, 02:44 PM   #7
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I'll try boots and springs first
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Old 04-29-2014, 06:56 PM   #8
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I just posted "One 8mm bolt makes a difference". I had a vacuum leak from my Valve Covers. I was missing on 8mm bolt. I installed it today. I drove all day for 4-5 hours. My idle is perfect (sounded like a misfire before). For 5 months my idle was rough. I went over everything. Scratching my head.. Finally.. It was the vacuum leak. People said "No Way can a Valve Cover leak affect anything". Well. a vacuum leak is a vacuum leak. All I can add here is to make sure your Valve cover gaskets are sealed and make sure your PCV valve and hoses are in check. Good luck.

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