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1987 - 1996 F150 Still running strong! Talk about your 8th and 9th generation Ford F150 trucks.

High idle

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Old Sep 18, 2018 | 05:52 PM
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Jet195's Avatar
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Default High idle

So I've got a 93 f150 5.0 4wd Auto tranny, I changed the tps and cleaned the throttle body and now it is idling anywhere from 1500-2000. Before I cleaned and changed these things it was idling at 1000. I've also unplugged all sensors connecting to the TB 1 at a time and none of them effected the idle. I've let it idle for probably 10 minutes and it hasn't came down any, also if I put it in gear it drops to a normal idle (1000). Any idea what the cause could be?
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Old Sep 18, 2018 | 08:38 PM
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A common problem with the Gen8 (87-91) was the idle air control solenoid (IAC) which straddles the throttle butterfly would gunk up. A good all-around spritz of carb cleaner followed by a check of free full-range motion usually cleared things up.
On the other hand, you could have a vacuum leak to chase - normal idle is about 850RPM.
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Old Sep 18, 2018 | 10:58 PM
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Originally Posted by wde3477
A common problem with the Gen8 (87-91) was the idle air control solenoid (IAC) which straddles the throttle butterfly would gunk up. A good all-around spritz of carb cleaner followed by a check of free full-range motion usually cleared things up.
On the other hand, you could have a vacuum leak to chase - normal idle is about 850RPM.
Yeah I think it's something to do with the IAC. The throttle body was nasty, it had a lot of gunk built up on it so I believe I could have clogged the IAC while cleaning. I haven't checked for vacuum leaks yet I'm gonna go through it Friday and see if I can find the problem. I appreciate the input though!
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