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Old 10-29-2006, 16:36   #1 (permalink)
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'94 F-150 Idle Problem

I have a 1994 F-150 and when im stopped at say a red light, the engine will randomy rev to about 1000 RPM from idle which is about 600-700 RPM. I have asked around and one of the answers ive heard is the IAC (Idle Air Control) Valve. Any one else know what could be wrong???
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Old 10-29-2006, 18:40   #2 (permalink)
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Re: '94 F-150 Idle Problem

Tune-up been done lately? Fuel filter been changed? Could be alot of things.
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Old 10-30-2006, 15:12   #3 (permalink)
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Re: '94 F-150 Idle Problem

Follow this thread for starters...

my5oh.com, Your Ford Tech Source :: View topic - How to do a Self-Test

then let us know the results.
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Old 11-05-2006, 15:49   #4 (permalink)
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Re: '94 F-150 Idle Problem

could this have n e thing to do with compressor, seems to do it more wen heat is on...
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Old 11-15-2006, 05:01   #5 (permalink)
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Re: '94 F-150 Idle Problem

so i played around with the truck and found out that the idle problem only happens wen the "Mix" "Def" "A/C" and "Max A/C" is on... any ideas???
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Old 11-15-2006, 17:37   #6 (permalink)
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Re: '94 F-150 Idle Problem

This is not a chat room. Ur typng bcms hrd 2 rd. You have been asked a couple questions,(such as Tune-up been done lately? Fuel filter been changed?)so someone could help you further, but you have not answered them.

By the way when you have 'the "Mix" "Def" "A/C" and "Max A/C" is on' this is when your air conditioning compresser is on, so it puts a load on your motor and pulls your idle down. Like Mullet Man said, it could be alot of things. More info. would help us help you.
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Old 11-19-2006, 15:03   #7 (permalink)
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Re: '94 F-150 Idle Problem

Quote:
Originally Posted by thefonz
This is not a chat room. Ur typng bcms hrd 2 rd. You have been asked a couple questions,(such as Tune-up been done lately? Fuel filter been changed?)so someone could help you further, but you have not answered them.

By the way when you have 'the "Mix" "Def" "A/C" and "Max A/C" is on' this is when your air conditioning compresser is on, so it puts a load on your motor and pulls your idle down. Like Mullet Man said, it could be alot of things. More info. would help us help you.
I'm typing all correctly... i dont know what your chatroom comment was about. But to answer the questions, it hasnt been taken to have a tune up as me and my dad do most of our matinence. Yes i realize the compressor is on and puts a load on the eninge but this is not the normal. The idle surges and does not stay steady. When it revs up its after i hear the compressor stop (you hear the loud click). And i lso realize it can be many things but i figured if i could tell you exactly what and when it does this you may be able top pin point what the problem is.
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Old 11-20-2006, 16:04   #8 (permalink)
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Re: '94 F-150 Idle Problem

Alright, I didn't mean to offend. It's just some people type quite abbreviated and it's not normally done on forums like this. (n e thing ...wen ) Anyhow, all this aside, It could be Idle air control valve or maybe throttle position sensor, or timing, maybe even a vacuum leak.

Have you tried any of the self tests that was suggested in post #3?
Also, if you have a manual for you vehicle, they give ways to test sensors and relays etc. Hope this helps. Someone with more info. may come along soon.
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Old 11-22-2006, 04:34   #9 (permalink)
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Re: '94 F-150 Idle Problem

Yeh, thanks. And no i have not done the self tests yet. My friend knows a mechanic and may look at the truck for me. Dont know yet.
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Old 11-27-2006, 18:54   #10 (permalink)
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Re: '94 F-150 Idle Problem

Remove the belt. If it idles fine then you know the compressor could be overcharged or the clutch is binding.
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