Throttle Position Sensor
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Senior User
Joined: May 2006
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From: Middleburg Florida
Throttle Position Sensor
I have a 90 F150 with a 5.0 ltr and need to change the TPS. I've got a Chiltons manual but found the 5 steps not easily understood. Any one have any experience with changing one of these?
New User
Joined: Jul 2003
Posts: 16
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From: Central Pa.
I changed one in my 95 f150 about a year ago.It takes longer to disconnect things to get to the tps than to accually change it.
My tps was located on the underside of the housing where the air ducts meet the engine,it's was a little black plug..can't remember the color of the wires..but I had to remove the ducts,remove the housing that the tps is mounted on because mine was on the underside maybe yours isn't.
There should be two screws holding it on take note when removing the old,when taking it off you will notice a spring like twisting as you take it off..not a big deal just remember the position when removing it and put the new one on the same way..you will have to align the slots then twist a little to align the holes to screw the sensor to the housing.
It's not a hard job..remember to disconnect the battery before you start removing the sensor...after you are done and everything is back together,start your truck and let idle for 2-3 minutes for the computer to learn everything again.
Hope this helped.
My tps was located on the underside of the housing where the air ducts meet the engine,it's was a little black plug..can't remember the color of the wires..but I had to remove the ducts,remove the housing that the tps is mounted on because mine was on the underside maybe yours isn't.
There should be two screws holding it on take note when removing the old,when taking it off you will notice a spring like twisting as you take it off..not a big deal just remember the position when removing it and put the new one on the same way..you will have to align the slots then twist a little to align the holes to screw the sensor to the housing.
It's not a hard job..remember to disconnect the battery before you start removing the sensor...after you are done and everything is back together,start your truck and let idle for 2-3 minutes for the computer to learn everything again.
Hope this helped.
Post Fiend
Joined: Nov 2001
Posts: 14,947
Likes: 6
From: Topsfield, MA
You should have a voltmeter out and be checking the idle voltage to the computer pin. There is a wide range in which it would work (like .70-1v) but optimal is about .96v with wide open throttle at 4.5v.
Should also check it for having a steady increase in voltage without any voltage spikes throughout its movement.
You should be driving the vehicle in order for the computer to re-learn it's programming. Take it for a 10 minute drive and make sure it runs fine.
Ybuck, that housing you speak of is the throttle body. On all of these trucks, the TPS is underneath the TB.
There are coolant lines on the TB, be prepared with a small cup and I used the end of a gear lube bottle as a plug in the hoses to prevent extra coolant from coming out. Pickup a new gasket for the TB too.
Should also check it for having a steady increase in voltage without any voltage spikes throughout its movement.
You should be driving the vehicle in order for the computer to re-learn it's programming. Take it for a 10 minute drive and make sure it runs fine.
Ybuck, that housing you speak of is the throttle body. On all of these trucks, the TPS is underneath the TB.
There are coolant lines on the TB, be prepared with a small cup and I used the end of a gear lube bottle as a plug in the hoses to prevent extra coolant from coming out. Pickup a new gasket for the TB too.
