LT1-LT4 Modifications 1993-97 Gen II Small Block V8

High Idle problem (with video)

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Old Oct 23, 2010 | 12:23 AM
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Default High Idle problem (with video)

Anybody got any idea what would make it do this?

http://www.youtube.com/watch?v=FT_X_ZhAXKw
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Old Oct 23, 2010 | 07:17 AM
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bad vacuum leak? or too much fuel, causing the computer to open the IAC trying to lean it out.


IDK
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Old Oct 23, 2010 | 07:55 AM
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What's the SES light all about?
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Old Oct 23, 2010 | 08:08 AM
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SES is for:

P0430 bank 2 (passenger cat?)
P0137 bank 1 sensor 2 (rear driver O2?)
P1441 (HVAC?)

I also have an exhaust leak on the drivers side that is starting to get pretty bad
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Old Oct 23, 2010 | 08:30 AM
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Is there a diagram anywhere of all the vacuum lines?
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Old Oct 24, 2010 | 02:34 AM
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Anybody got more ideas?
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Old Oct 24, 2010 | 03:40 AM
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http://shbox.com/1/4th_gen_tech1.html
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Old Oct 24, 2010 | 09:00 AM
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Been there plenty, but thanks....I guess

Took the vacuum off the valve cover that goes to the throttle body and the idle went down to bout normal....no idea why it would do that
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Old Oct 24, 2010 | 09:46 AM
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Originally Posted by bds001
Been there plenty, but thanks....I guess

Took the vacuum off the valve cover that goes to the throttle body and the idle went down to bout normal....no idea why it would do that
did you mess with or remove your PCV lately? lets say you capped it off and left that tube from the valve cover to the TB you would be experiencing a vacuum leak. if thats the case just run a breather on the valve cover.
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Old Oct 24, 2010 | 11:22 AM
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No haven't messed with the Pcv

Could it have gotten clogged up?
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Old Oct 24, 2010 | 02:07 PM
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Test the TPS sensor, That sensor is capable of alot of strange **** when it goes bad..Mine idle'd at 1500 and when driving under very very little load when it shifted it would chirp the tires hahah. Crazy stuff
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Old Oct 25, 2010 | 04:25 AM
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The best thing to do is monitor your IAC counts with scanning software, aside from visual cues like broken vacuum lines, etc. Do you still have the fresh air supply hose on the passenger side valve cover?
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Old Oct 26, 2010 | 08:26 PM
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I think I am having about this same issue. Motor just idles down slowly sometimes or not at all. Was thinking its the maf sensor cause if I tap on it, it comes down quick.
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