3rd Generation Specific (1993-2002) 1993-2002 Discussion including performance modifications and Technical Support Sections.
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Very Rough Idle

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Old 07-28-04, 05:44 PM
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Angry Very Rough Idle

I had some rough idle problems, so i replaced the plugs, and that didnt help, so i hooked a timing light up. and i get signal to all the plugs. Is there a ground that could be bad. my map sensor is hooked up fine. Is there anything else I should check that maybe be wrong.
Old 07-28-04, 06:09 PM
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if you think it might be a ground, the easiest and quickest thing to do is just add a couple of ground wires rather than guessing. are you running a stock ecu?
Old 07-28-04, 06:10 PM
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this thread might help also.
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/fixed-my-idle-problems-backfiring-bucking-more-170731/
Old 07-28-04, 06:12 PM
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Originally Posted by OnequickRX7
Is there anything else I should check that maybe be wrong.
Lots of things to check. Start by searching for and reading the thread in the Advanced Tech section. Then search for rough idle and read those threads too.

Could be so many different things. Too many to diagnose just by you telling us your idle is rough.
Old 07-28-04, 06:17 PM
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If everything is stock, then check out the idle motor behind your UIM. There is a wiring harness back there that has a bad habit of cracking on you
Attached Thumbnails Very Rough Idle-p7070012.jpg  
Old 07-28-04, 06:52 PM
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the mods i have are, dp, cb, manual boost controller, stock ecu, intake
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