Once more into the void...- does someone have a flashlight?

[John Cody Forbes]

JOHN SHERROW wrote:
> I don't think the car can "idle" at 3000 rpm.
>
> I put idle in quotes because at idle when the TPS is closed the decel
> valve should kick in if the RPM's are above 1500 rpm. This creates
> the cycling idle some people complain about when the idle goes awry.
>
> I'd say the throttle switch wiring is kaput.
>
> Does the idle stay at 3000 with the ISV unplugged? I read awhile back
> that some one replaed the control module and solved a similar
> problem. Based on what I've read about the decel valve the solution
> did not make sense to me.
>
>


The ISV being all the way open (stuck open) will make it idle at 3,000 
almost exactly. I figured that out on my 5ktq once I cranked the boost a 
bit. When closing the throttle the pre-throttle post-turbo ISV intake blows 
the ISV piston back into the body of the ISV so hard that it destroys the 
ISV. Went through 3 of 'em before I figured out what was going on.

-Cody Forbes
http://www.5000tq.com
'86 5k noT noQ
'86 5k noT noQ - Parting Out
'87 5ktq
'87 5ktq - Fast. Really Fast.