TPS adjustment and installation

1993 FORD F-150
250,000 MILES • 4.9L • 6 CYL • 4WD • MANUAL
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JGANAWAY
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How do you install a TPS sensor? I took it off to clean the throttle body and when I put the throttle body, IAC and the TPS back on, the rpm's at idle are at 1,000 and at times while shifting the rpm's will stay around 1,700.
Jul 17, 2018 at 7:52 AM
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ASEMASTER6371
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Good evening.

The spec for the throttle position sensor is .5 to .75 volts at idle. Out of adjustment will not cause a high idle. That comes from either a vacuum leak at the throttle body to intake or a bad idle air control.

The IAC cannot be cleaned as the area that sticks cannot be accessed. remove the wires from the IAC and see if the idle drops to 500 or stalls.

Roy

https://www.2carpros.com/articles/engine-idles-too-high

https://www.2carpros.com/articles/how-to-replace-an-idle-speed-control-motor-iac
Apr 2, 2021 at 12:11 PM
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JGANAWAY
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Thanks for the information. How do you correctly reinstall the TPS? I unplugged the IACV and the idle dropped to 300 to 500 rpm's. Does that mean it is good? If I am correct, if it was bad, there would not be any difference in the idle.
Apr 2, 2021 at 12:11 PM
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ASEMASTER6371
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Yes, it is bad. I would replace the IAC with a new one.

Can you post a picture of the TPS?

Roy
Apr 2, 2021 at 12:11 PM
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JGANAWAY
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Yes, I will when I get home. Thanks for your help.
Apr 2, 2021 at 12:11 PM
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ASEMASTER6371
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You are welcome.
Apr 2, 2021 at 12:11 PM
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JGANAWAY
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Here are the pictures of the TPS.
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Apr 2, 2021 at 12:11 PM
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JGANAWAY
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A picture of the TPS location (bottom right) on the throttle body.
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Apr 2, 2021 at 12:11 PM
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ASEMASTER6371
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The TPS just bolts on the throttle body. there is no adjustment. if there was, there would be elongated bolt holes.

Just bolt it back on and connect it up. replace the IAC assembly.

Roy
Apr 2, 2021 at 12:11 PM
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JGANAWAY
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Okay, thank you and I appreciate your help with this.
Apr 2, 2021 at 12:11 PM
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ASEMASTER6371
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Anytime, we are here to help.

Roy
Apr 2, 2021 at 12:11 PM
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JGANAWAY
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I bought a IAC valve from AutoZone. The rpm's are still around 800 to 900. The only thing different, is now the rpm's go up and down not by much. When I unplugged it, the rpms dropped to 300 to 500.
Apr 2, 2021 at 12:11 PM
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JGANAWAY
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Is the new IAC bad too or is the problem related to something else?
Apr 2, 2021 at 12:11 PM
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ASEMASTER6371
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No, 800 is about right.

Drive it and see if it settles down.

Roy
Apr 2, 2021 at 12:11 PM