mechanic problems
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2nd Gear
Joined: Feb 2023
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mechanic problems
im working on a 1997 ford f250 an im having to unplug the idle air control valve. has anyone drove their truck with out the air valve plugged in. if so how did the truck react to it an did it cause any other problems after replacing it???? i have researched it all day an they say that you can drive it without it but may cause other problems to the motor. didnt know if there may be some one on here that has had the same problem. needing a little insite on what i may be dealing with. its a good truck with a brand new motor. if the idle air valve aint causeing the problem what else could be causing the problem??? its a 4.6L motor. the problem im having is that the temperature gauge will peg an the oil light comes on an the check engine light stays on all the time it just started all of a sudden. the truck has been running really well then went to town an on the way back it pegged out an the light came on
Trailering
Joined: Feb 2023
Posts: 16
Likes: 1
From: NJ
Any codes? Temperature gauge pegging can mean you have a connection issue or you have high temps. Same with the oil gauge. If you can live monitor, especially temperature, you'll see either the min or max temperatures, and compare to real life. Pegged typically points bad connections somewhere.
Hotshot
Joined: Jan 2004
Posts: 19,763
Likes: 1,081
From: St Louis
The IAC has nothing to do with your symptoms. Its purpose is to control airflow when the throttle place is closed so the engine will still run at idle.
If the check engine light is on, you need to read the fault codes so you know what's it is complaining about.
If the check engine light is on, you need to read the fault codes so you know what's it is complaining about.
Trailering
Joined: Feb 2023
Posts: 16
Likes: 1
From: NJ
You need IAC for proper idle. If idle isn't proper, someone may have messed with the screw on the throttle body (this isn't an idle screw). PCM expects TPS voltage reading of X, so it gets cooky if the screw was messed with. Code is basically stating this, as the rpms are higher than commanded, and IAC can't control it.
Temperature you need to verify if it is truly high temperature or a pegged sensor due to connection/wiring.
In the long run, you have an engine that can't control idle speed. If it's truly over heating, that's a problem. If it isn't, then you won't know when it's overheating. I'd imagine the ECT feedback to the computer also being fubared doesn't help with driveability.
Temperature you need to verify if it is truly high temperature or a pegged sensor due to connection/wiring.
In the long run, you have an engine that can't control idle speed. If it's truly over heating, that's a problem. If it isn't, then you won't know when it's overheating. I'd imagine the ECT feedback to the computer also being fubared doesn't help with driveability.
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RobinRL
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May 15, 2021 12:27 AM
