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

Quick Idle ? Tap the Pedal

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Old Jan 27, 2006 | 02:12 PM
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Default Quick Idle ? Tap the Pedal

Funny little idle problem- did some searches and nothing seems to be on par with it....'92 6sp ... come to a light push in clutch idle hangs at around 1800, tap the accelarator and it will fall, sometimes to stock idle, sometimes to about 1100RPM....now the way I see it, it shouldnt be vacuum as it is "adjustable" with a "tap" on the pedal - so I was thinking throttle cables, but that doesnt seem to help either. I guess it is going to take time screwing with it, just wanted to see if anyone else here has had some problem..?

Phil
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Old Jan 27, 2006 | 02:26 PM
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The bore the throttle shaft rides in is probably worn and allowing the throttle blades to bind up before reaching fully closed.
I believe that is the same problem CentralCoaster was having with his car. He sent me his throttle body and I bored it out and installed a pair of needle bearings in it for the shaft to ride in.

To check yours, grab the end where the throttle cable connects and try to move it up and down and fwd and back. If you hear it moving around or feel "lots" of movement, yours is worn.

Last edited by Morley; Jan 27, 2006 at 02:33 PM.
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Old Jan 27, 2006 | 02:36 PM
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Originally Posted by Morley
The bore the throttle shaft rides in is probably worn and allowing the throttle blades to bind up before reaching fully closed.
I believe that is the same problem CentralCoaster was having with his car. He sent me his throttle body and I bored it out and installed a pair of needle bearings in it for the shaft to ride in.

To check yours, grab the end where the throttle cable connects and try to move it up and down and fwd and back. If you hear it moving around or feel "lots" of movement, yours is worn.

Cool- I will check that here in a minute- thanks!
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Old Jan 27, 2006 | 03:43 PM
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I had the same problem. I think it is quite common.
I just used some graphite lubricant where the throttle body plate rotates. Problem solved. I was told this solution would only be temporary but it has been working for over a year.
With mine if I opened the throttle plate with the lever on the side of the throttle body while the car was running, I could get it to stick just before closed. If I tried to do this with the car off I couldn't get it to stick at all.
This should prove it is the throttle body plate, not a sticking cable or something else.
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Old Jan 27, 2006 | 03:49 PM
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Originally Posted by 87 rag
I had the same problem. I think it is quite common.
I just used some graphite lubricant where the throttle body plate rotates. Problem solved. I was told this solution would only be temporary but it has been working for over a year.
With mine if I opened the throttle plate with the lever on the side of the throttle body while the car was running, I could get it to stick just before closed. If I tried to do this with the car off I couldn't get it to stick at all.
This should prove it is the throttle body plate, not a sticking cable or something else.
I was just outside screwing with it and you explained it to a T - that is exactly the problem. Off to the store I go!
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Old Jan 27, 2006 | 03:57 PM
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let us know how it works out.
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