skyhigh4by
1/2 ton status
Runs great and has good smooth power but its as tempermental 49 year old woman.
Ive rest the IAC probably 50 times. Get the idle down to about 750 and everything is happy. Go for a little drive and it works its way back up too 900-1300 depending on its mood. No fluctuation just higher than it should be. Shut the truck off and start it back up and TADA!!! idle is back down where its supposed to UNTIL you go for a little drive again then its back up
I notice this mainly when stopping at traffic lights. Sometimes if its a long enough light the idle will very slowly work its way back down to maybe 800 but not always. Also sometimes the idle doesn't come up at all on a drive. Every now and then it will settle back down to about 800 rpm at every light I stop at.
Its a holley throttle body, MAP vac moved to front port, the IAC is new, coolant temp sensor is new, fuel pressure is stable at 12.5 PSI, new heated o2 sensor, vacuum is stable 21in-hg at 800 rpm idle.
It has a non adjustable TPS that I have elongated the holes on but I haven't been able to get the voltage below .85 with the throttle closed. Thats about the only thing I can think of but Im not totally convinced that its the cause.
I have 1 stock prom and 3 tuned ones and it does the same thing with all of them.
ideas...???
Ive rest the IAC probably 50 times. Get the idle down to about 750 and everything is happy. Go for a little drive and it works its way back up too 900-1300 depending on its mood. No fluctuation just higher than it should be. Shut the truck off and start it back up and TADA!!! idle is back down where its supposed to UNTIL you go for a little drive again then its back up
I notice this mainly when stopping at traffic lights. Sometimes if its a long enough light the idle will very slowly work its way back down to maybe 800 but not always. Also sometimes the idle doesn't come up at all on a drive. Every now and then it will settle back down to about 800 rpm at every light I stop at.
Its a holley throttle body, MAP vac moved to front port, the IAC is new, coolant temp sensor is new, fuel pressure is stable at 12.5 PSI, new heated o2 sensor, vacuum is stable 21in-hg at 800 rpm idle.
It has a non adjustable TPS that I have elongated the holes on but I haven't been able to get the voltage below .85 with the throttle closed. Thats about the only thing I can think of but Im not totally convinced that its the cause.
I have 1 stock prom and 3 tuned ones and it does the same thing with all of them.
ideas...???
