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Darkwhite
07-05-2006, 01:34 PM
I have a 91 SC latley my Idle has jumped to 2000 at idle and 1000 when in gear but the weird thing is the car will accelerate to about 60-70 km/hr by itself which is weird and I am getting about 250 km to a full take i used to get 500+ so I am figuring its running rich and my throttle may be stuck open I thought it was the IAC but I only get code 125 which is the TPS Voltage changed out the TPS and still have the problem.

Any other ideas?

I am gettign desperated

chazzwozzle
07-05-2006, 02:01 PM
sounds like a bad iac to me. does the engine make a sound kinda like a goose when you shut it down? if so definitely the iac. theres a plastic diaphragm inside of it that tends to rupture and cause the high idle you describe.

CMac89
07-05-2006, 02:02 PM
It's the IAC, my car does the same stuff. Shortly you'll hear some type of dying goose honk when you shut your car off.

quick35th
07-05-2006, 02:18 PM
Yep, the IAC is the cause to your problem. Same thing happend to my old 91 SC back in the day.

Shane

Darkwhite
07-05-2006, 03:16 PM
well took 107$ at a ford dealership to tell me that it used to make the goose honk but now the parts friend they put a piece of cardboard in there so my idle is back to normal now I just need to get the part tonight.

Darkwhite
07-06-2006, 09:48 AM
do you need a Gasket or something Between the IAC and the TB I just installed one and didn't put anything between because nothing was there before?

Just makign sure its on right.

Adam

CMac89
07-06-2006, 10:03 AM
do you need a Gasket or something Between the IAC and the TB I just installed one and didn't put anything between because nothing was there before?

Just makign sure its on right.

Adam
Yeah, there is supposed to be a gasket, but if the car's running fine then you'll be okay.