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TPS adjustment and installation

Tiny
JGANAWAY
  • MEMBER
  • 1993 FORD F-150
  • 4.9L
  • 6 CYL
  • 4WD
  • MANUAL
  • 250,000 MILES
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.
Tuesday, July 17th, 2018 AT 7:52 AM

13 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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
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Friday, April 2nd, 2021 AT 12:11 PM
Tiny
JGANAWAY
  • MEMBER
  • 42 POSTS
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.
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Friday, April 2nd, 2021 AT 12:11 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Yes, it is bad. I would replace the IAC with a new one.

Can you post a picture of the TPS?

Roy
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Friday, April 2nd, 2021 AT 12:11 PM
Tiny
JGANAWAY
  • MEMBER
  • 42 POSTS
Yes, I will when I get home. Thanks for your help.
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Friday, April 2nd, 2021 AT 12:11 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.
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Friday, April 2nd, 2021 AT 12:11 PM
Tiny
JGANAWAY
  • MEMBER
  • 42 POSTS
Here are the pictures of the TPS.
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Friday, April 2nd, 2021 AT 12:11 PM
Tiny
JGANAWAY
  • MEMBER
  • 42 POSTS
A picture of the TPS location (bottom right) on the throttle body.
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Friday, April 2nd, 2021 AT 12:11 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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
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Friday, April 2nd, 2021 AT 12:11 PM
Tiny
JGANAWAY
  • MEMBER
  • 42 POSTS
Okay, thank you and I appreciate your help with this.
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Friday, April 2nd, 2021 AT 12:11 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Anytime, we are here to help.

Roy
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Friday, April 2nd, 2021 AT 12:11 PM
Tiny
JGANAWAY
  • MEMBER
  • 42 POSTS
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.
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Friday, April 2nd, 2021 AT 12:11 PM
Tiny
JGANAWAY
  • MEMBER
  • 42 POSTS
Is the new IAC bad too or is the problem related to something else?
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Friday, April 2nd, 2021 AT 12:11 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
No, 800 is about right.

Drive it and see if it settles down.

Roy
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Friday, April 2nd, 2021 AT 12:11 PM

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