idle bounce only after throttle or grnd/ten jump - Miata Turbo Forum - Boost cars, acquire cats.

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Old 12-27-2008, 12:46 PM   #1
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Default idle bounce only after throttle or grnd/ten jump

Looks like i got a problem with my '90...

Last week i went to start it, and it barely stumbled to life. I assumed it was a problem with the injectors since i never had them cleaned after i got them, so i sent them out. They came back and were fine.

Now after installing them, the car starts, and idles fine, until i give it gas. After letting off, the rev's drop to ~150-200rpms as it almost stalls, then rise back up to ~900-1000rpm, then drop to 500, and finally settle at 900.

The dashpot isnt the problem, and when grnd+ten are jumped, revs constantly go from 200 to 800 to 200 and so on until it's removed.

Any ideas?
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Old 12-27-2008, 12:59 PM   #2
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To me it sounds like the idle air control valve. I had the same problem on mine and that's what it was for me. The GRD TEN thing seems weird to me, but i never did that when i had the problem. It is either that or a vacuum leak somewhere.
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Old 12-27-2008, 01:08 PM   #3
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tested vac and it's around 19-20lb when the idle is steady so i dont think there's a leak

Looks like i'll have to try and clean that idle valve. damn.
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Old 12-27-2008, 04:46 PM   #4
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can't a weak alternator do this sometimes?
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Old 12-27-2008, 05:05 PM   #5
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Actually that would make sense for the almost dying part after giving it gas, but what about the GRD TEN part? What exactly does that jumper do? I know what function it serves to do it, but what changes when you do that? That would be where i would start. Find out what making that jumper does in the first place.
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