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Old 12-23-2003   #9
Kracka
R U DTF bro?
 
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Join Date: Aug 2003
Location: Oak Point, TX
Drives: C8 Stingray Z51
Posts: 20,620
From everyone's good friend, Rick Shindley:

I worked on a '91 today that had bad idle surge. I checked the ISC
motor and cleaned the throttle body for starter. No affect.

I cleaned the BISS and checked its o-ring. No affect.

I removed the ISC motor and disassembled it. No problems found.

I reset the idle switch (throttle plate stop). No affect.

Finally, I removed the throttle body (again) and disassembled the
fast idle air valve. It was black with carbon. Rather than risk it
not working, I replaced the lower throttle body assy with one from
an old '95 throttle body (I didn't have a 1G TB lying around). It
worked!!! The FIAV was stuck open (apparently) and wouldn't close
when the coolant to the TB got hot.



Rick
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Quote:
Originally Posted by Murlo26 View Post
I agree with Kracka.
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