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

Idle and Goose Issue

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Old Dec 18, 2014 | 10:23 AM
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Default Idle and Goose Issue

Let me try to explain my issue:

I have a 1986. I have replaced the intake gaskets, egr, aim, tps, purge valve, vacuum lines, rotor, cap, coil, plugs, wires, transmission, knock valve, starter, rear mains, power steering pump, gutted air pump, fan relay, fan pig tail, master cylinder - and many more interior and exterior parts.

I wanted to mention the engine bay and running gear so readers can have a sense of what was replaced.

How to the problem at hand. When I reach under the hood and move the throttle lever to "goose" the engine and then let it go it takes what seems like too long to reduce idle back to "pre-goose" condition.

This problem was there before I gutted the AIR pump. I checked vacuum lines and can not find a leak.

The car also idles high after driving for a while. Start it in morning and after heat up it goes to 7000 rpms. Drive it then stop at a red light it is at 10,000 to 11,000 rpms. If I "goose" it the rpms will go to 6,000 to 7,000.

Any help appreciated.
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Old Dec 18, 2014 | 11:44 AM
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I had same problem. It turned out to be cruise control cable binding and not letting TB return completely some of the times
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Old Dec 18, 2014 | 01:34 PM
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Originally Posted by mlm0
I had same problem. It turned out to be cruise control cable binding and not letting TB return completely some of the times
I removed the cruise control cable when I bought car because because it was frayed.
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Old Dec 18, 2014 | 03:03 PM
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Originally Posted by 66cutlass
The car also idles high after driving for a while. Start it in morning and after heat up it goes to 7000 rpms. Drive it then stop at a red light it is at 10,000 to 11,000 rpms. If I "goose" it the rpms will go to 6,000 to 7,000.
How much did that 11,000 RPM engine build cost you?





Being serious make sure there is nothing causing the throttle body to stick open.
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Old Dec 19, 2014 | 09:18 AM
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Lets start with basics. Are you sure your timing is right? What about your fuel pressure? If all is right, what about your throttle body? Did you take the IAC out AND the housing off the TB and clean it thoroughly? Passages and all?
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Old Dec 19, 2014 | 09:20 AM
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The timing is probably off since I don't have a timing light. I will take it to auto shop and have that set first.
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Old Dec 19, 2014 | 11:19 AM
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Originally Posted by 66cutlass
The timing is probably off since I don't have a timing light. I will take it to auto shop and have that set first.
what aklim said...did you clean all passages of your tb? like with carb cleaner? get right in there and make it all squeaky clean? and into the throats of the intake?
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