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Misfire update with questions

 
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Old 06 Dec 2009, 05:49 pm
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Default Misfire update with questions

Here's the recent history: Had a misfire, but no fault codes. I thought is was related to transmission that had just been rebuilt. Replaced plugs and car ran like a rabbit. Misfire came back after a few weeks with a vengance, along with a rattle under the upper timing belt cover. Rattle will come and go, but misfire always happens under idle. Just recently tripped a 303 code, but it cleared itself. 2 weeks later, it came back and hasn't gone away. Ran 2 bottles of fuel injector cleaner through it and the car ran better.

I saw the gasket issue brought up and I will check it. However, my concern is the idler pully and/or timing belt. I've only got 71+K miles on it ('02 Limited). Anybody have a similar issue with this few miles?

Thanks.
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Old 07 Dec 2009, 10:48 am
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Default Re: Misfire update with questions

Rattle could be idler pulley, but how does the car run off idle? From what I know, if the belt was going, or jumped a tooth, it'd run like crap all the time.
Another cure of a misfre I read of was an injector for that cylinder - if cleaner doesn't help, and intake gasket okay, and plugs/wires have been swapped with another cylinder to rule them out.
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Old 08 Dec 2009, 08:49 pm
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Default Re: Misfire update with questions

car runs pretty smooth at speed. Occasionally, it will miss when increasing speed (like on interstate). car misses at stop lights and stutters on acceleration, but once it gets in gear, it's fine. That was why I had the initial thought of something screwy in the transmission. It's starting to stutter more now that the fuel injection cleaner has run through.
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Old 08 Dec 2009, 08:59 pm
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Default Re: Misfire update with questions

Did you replace wires when plugs were done? Stock wires don't last. Should do both at the same time.
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