C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

1994 idle rising

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Old Jan 19, 2015 | 05:51 AM
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Default 1994 idle rising

When I put my car in park it is sometimes, lately rising up to around 1200 rpm.
Can anyone tell me why it would do this?
Rick
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Old Jan 19, 2015 | 06:53 PM
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Originally Posted by llesg
When I put my car in park it is sometimes, lately rising up to around 1200 rpm.
Can anyone tell me why it would do this?
Rick
Hi Rick

I'm on the same problem, could be a lots of things
Just to quote some

I've already replace IAC,

removed and fully cleaned TB and IAC housing, (absolutely DON'T try to remove TB blade screws or you will broke them)

spray wd 40 on TB shaft

Replaced spark plugs this have made an improvement however not was the core

And still not resolved it...

Others forum Members more capable then me suggest to check for vacuum leaks and get a scanner for a diagnosis to make

And this is i'm going to do in the next days

also yesterday, here on forum I learnt of a procedure to re-set the IAC when replaced, i will try this....
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Old Jan 19, 2015 | 11:24 PM
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Default blow cigar smoke in a hose and watch for it come out somewhere else.

like scotty.

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Old Jan 20, 2015 | 05:55 AM
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Originally Posted by Christi@n
Hi Rick

I'm on the same problem, could be a lots of things
Just to quote some

I've already replace IAC,

removed and fully cleaned TB and IAC housing, (absolutely DON'T try to remove TB blade screws or you will broke them)

spray wd 40 on TB shaft

Replaced spark plugs this have made an improvement however not was the core

And still not resolved it...

Others forum Members more capable then me suggest to check for vacuum leaks and get a scanner for a diagnosis to make

And this is i'm going to do in the next days

also yesterday, here on forum I learnt of a procedure to re-set the IAC when replaced, i will try this....
Just yesterday evening i learnt here "HOW TO READ CODE ON CORVETTE SPEEDOMETER USING A PAPER CLIP ONLY"

Great i will do soon, so i can avoid from spent 250 € in scanner, for the moment

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Old Jan 20, 2015 | 05:55 PM
  #5  
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Originally Posted by VikingTrad3r
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Old Jan 20, 2015 | 07:13 PM
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I would check for vacuum leaks.

Check the TB return spring to be sure that the TB blades are not binding on the return.

I would not use WD40 as a lubricant for the TB, it is a water displacement (WD) agent. I would use a dry lubricant or graphite.
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