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92 Ford F-250 5.8l W (IDLES HIGH)

 
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Old 01-19-2016, 11:30 AM
Gooz
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92 Ford F-250 5.8l W (IDLES HIGH)

Okay I need help trying to find the reason why my engine is idling high. I probably made a mistake by washing the engine. Because since then it idles high. Can someone tell me why.

All I did was change oil, flushed out cooling system and replaced thermometer and the housing, and washed the engine. After washing it I turned it on and it was idling high I took it around the block and it was still doing it. I turned off and then wouldn't turn back on do to water in the distributor, so I dried it and now it starts but still idles high.
 
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Old 01-19-2016, 11:55 AM
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You may have gotten water in your idle air valve. It's the large metal canister bolted near on the throttle body with a wire coming out of it.

Take it off, and see if the plunger inside still moves freely.
 
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Old 01-19-2016, 12:16 PM
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Originally Posted by Lead Head View Post
You may have gotten water in your idle air valve. It's the large metal canister bolted near on the throttle body with a wire coming out of it.

Take it off, and see if the plunger inside still moves freely.
Okay i have it off what do I use to see if it moves without damaging it?
 
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Old 01-19-2016, 12:33 PM
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look for broken vacuum lines. If you have the original lines, they can be brittle and break when old. That will cause a high idle.
 
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Old 01-19-2016, 12:55 PM
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Sometimes when you wash the engine bay you will then let the smoke out of the PCM.
That will cause the high idle too.
 
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Old 01-19-2016, 12:55 PM
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Originally Posted by Gooz View Post
Okay i have it off what do I use to see if it moves without damaging it?
Inside there is a shaft that moves back and forth with a plunger in the middle. Just stick a flat head screw driver in there and start wiggling an see i it moves.
 
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Old 01-19-2016, 04:58 PM
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A diagram of the IAC shamelessly stolen from the Old Fuel Injection Technical Library:
 
 
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