I have just completed a 331 build in my 1995 mustang here is a brief rundown AFR heads Trick flow intake x 303 cam 75MM BBK throttle body 5 speed MSD dist 10-1 compression. The motor surges to 2000 and comes down slowly to 900 The car hangs between shifits and the idle is poor, The car has been at the tuner for a week still the same any suggestions very frustrating can't drive as it stalls.
Hanging Idle
- Thread starter pcarosel
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If you don't have any mechanical stuff goin on such as v leaks,
faulty parts such as isc and the like
then ... the next q would be .......
Do ya have confidence in this tuner
Did he give it back to you in that condition with no explanation
Grady
faulty parts such as isc and the like
then ... the next q would be .......
Do ya have confidence in this tuner
Did he give it back to you in that condition with no explanation
Grady
Haing idle
Grady
Tuner still has car had is for a week. Put in new ecu still hangs and stalls What is ISC this is my first computer build Everything on this build is new except original 302 block bored .030. This is the second tuner the tuner that the car is now at thinks it may be in the throttle body he changed my 75mm BBK and put on a ford motor sport can't road test rain in mi and he was closing for the weekend
Grady
Tuner still has car had is for a week. Put in new ecu still hangs and stalls What is ISC this is my first computer build Everything on this build is new except original 302 block bored .030. This is the second tuner the tuner that the car is now at thinks it may be in the throttle body he changed my 75mm BBK and put on a ford motor sport can't road test rain in mi and he was closing for the weekend
Don 95Vert
Founding Member
Like was aid the main cause is usually a vacuum leak. The second main cause is that the IAC is at or near it's limit of travel, usually because of a new TB - for that, set the TB to factory idle spec and do an IAC and TPS reset.
Don
Don
hipluther01
New Member
Im having the same problem. When I hit the clutch at 2500 RPM it will idle up to about 3200-3500RPM for a couple seconds and then idle down. What is the IAC and how do you reset it?
