loping idle in neutral


nooberiffic

15+ Year Member

Joined
May 21, 2009
Messages
173
Points
3,101
Vehicle Year
1990
Transmission
Manual
Have a problem with surging RPM's when in neutral. Its not throwing any codes, I checked for intake leaks, cleaned the MAS, the IAC, TB, adjusted the TPS correctly (I believe, .96 volts at closed closed throttle), and reset the computer.
It only happens under a certain set of conditions.

Engine is not under load. Vehicle is moving (if I am at a complete stop or just crawling to a stop the issue goes away), and the transmission (5 speed) is in neutral. Only does this when the engine is at operating temp. If it is cold and put it in neutral and coast it kicks down once, then goes back up to cold idle rpm.

Any ideas guys?
Thanks
 
Last edited:
BTW, I should add, that if I even just touch the clutch, it stops.
 

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