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Re: E150 5.8 Stuck on Fast Idle HELP!!
Never use carb cleaner it leaks down the shaft and fries the TP sensor. I was going to have you use the voltmeter to check for tp reading at idle. ISC unplugged should give you base idle of around 6 or 7 hundred rpms. All the ISC is is a fluctuating vacuumn leak. To rule it out loosen screws and slide cardboard under sensor to block holes and it should idle very low. If that works and unplugging it doesnt it is either on backward or it is bad. Is there a plate under it? Some had this and it can only go on one way.
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1967 cougar 390 FE in progress
1993 F350 Crew Cab 5.8 111K
1983 Coachman 23ft class C 460
1988 Bronco 351 C6
1964 Galaxie 428 4sp project
1995 Mustang 3.8 Auto
1966 Mustang Fast back Project
1994 Tracer Trio 1.9
1968 F250 Camper Special 390
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