High idle problems

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Feb 6, 2008 | 11:33 PM

hoboben

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From: Midland, Tx.

High idle problems

Ok, so my 93 trans am is almost always idleing at somewhere around 1500 - 2000rpm, however, when i rev lightly at a stop, (M6, clutch in) the idle will sometimes drop to normal (800-900), but sometimes it will just drop back to somewhere between 1500-2000rpm, anyone have any ideas?

Thanks,
Ben

Feb 6, 2008 | 11:34 PM

sweet-94z28

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Sounds like there might be an issue with your IAC valve

Feb 6, 2008 | 11:36 PM

roadtrip120

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From: Texas

IAC or vacume leaks

Feb 6, 2008 | 11:37 PM

sweet-94z28

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spray carb and choke cleaner on the engine and see if it revs up at all

Feb 7, 2008 | 02:48 AM

mtperformance

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From: wisconsin

Quote:

Originally Posted by sweet-94z28

spray carb and choke cleaner on the engine and see if it revs up at all

That is not a super good idea , if you hit an electrical device and cause an arc your going to have a big *** fire (watched a guy do it and he looked funny with no eye brows ) if your going to go that route then just hit the areas around the areas LIGHTLY and lesson for a noticeable change in rpms . Can you check the voltage for you tps it should be close to .67 of a volt at idle?

Feb 7, 2008 | 06:08 AM

sweet-94z28

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Well, i've done it hundreds of times and seen it done hundreds of times. I've not had any problems. You have to use your brain when you do it (don't spray it on headers or heavily on the electrical devices).

Feb 7, 2008 | 07:51 AM

Bad_tx_Z28

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From: St Petersburg Florida

i have the same prob, but only when the car is warm...cold it idles about 750-800 rpms. I think my probs is the 02's though

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Feb 7, 2008 | 11:26 AM

Bad_tx_Z28

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From: St Petersburg Florida

i know mine only does it after the car is warm...and of course i get the ses and open loop

Feb 7, 2008 | 11:37 AM

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sweet-94z28

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OK, then you are probly right. Get some new O2's. Avoid Bosch

Feb 7, 2008 | 12:58 PM

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Bad_tx_Z28

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From: St Petersburg Florida

yeah thats what i heard...what do you recomend??

Feb 7, 2008 | 01:44 PM

#12

sweet-94z28

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I would get AC Delcos or Delphis. They are the same thing and they seem to work the best in our cars.

Feb 10, 2008 | 12:42 AM

#13

Dleep79

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From: STL

I had this problem on my 93 when i first bought it, I found that the return spring on the throttle body had popped out of position and wasn't provideing enough return pressure. You may want to check that.

Feb 11, 2008 | 08:16 AM

#14

hoboben

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From: Midland, Tx.

yeah, i found out that its not always pushing the throttle all the way back, how do you make it have more resistance?

Feb 11, 2008 | 06:25 PM

#15

SLawson86

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From: Statesboro, Georgia

i fixed a v6 camaro yesterday that had that problem... i knocked the bracket forward a bit towards the throttle body and fixed it. but to the other posters, dont use carb and choke cleaner, use brake cleaner and look for a bog... a bit safer