New TPS Causing Issues?
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Cross-Country
Joined: Dec 2022
Posts: 57
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New TPS Causing Issues?
I have a 1995 F-150 with the 4.9L and E4OD, I had been getting a code while running a KOER test (but no check engine light while driving) for low TPS voltage. The truck ran fine and had good throttle response and stuff, but I went ahead and replaced it with a new one. Now I've noticed that occasionally when I go from park to either drive or reverse, it will immediately try to idle up to around 1100 RPM for 5-10 seconds like it does initially on cold starts and then come back down. I can't seem to find a pattern of when it does this, it's completely random. Not sure if I should just throw the old TPS back on and call it fine seeing that it still worked and functioned perfectly before I took it off, it was just very black inside.
Lead Driver
Joined: Jun 2021
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I have a 1995 F-150 with the 4.9L and E4OD, I had been getting a code while running a KOER test (but no check engine light while driving) for low TPS voltage. The truck ran fine and had good throttle response and stuff, but I went ahead and replaced it with a new one. Now I've noticed that occasionally when I go from park to either drive or reverse, it will immediately try to idle up to around 1100 RPM for 5-10 seconds like it does initially on cold starts and then come back down. I can't seem to find a pattern of when it does this, it's completely random. Not sure if I should just throw the old TPS back on and call it fine seeing that it still worked and functioned perfectly before I took it off, it was just very black inside.
Hotshot
Joined: Jul 2020
Posts: 10,529
Likes: 2,657
From: Near Salt Lake City
The backprobe procedure (I use a ground flat paperclip with my DVOM)
The orange wire should be reference voltage and have 5 volts
The green wire (signal return) is the one that changes with throttle position and should vary between .8 and 4.5volts
You watch that voltage sweep on the DVOM as you move the throttle
You could also do it the easy way (Fords way) with a NGS and just read the TP PID
The orange wire should be reference voltage and have 5 volts
The green wire (signal return) is the one that changes with throttle position and should vary between .8 and 4.5volts
You watch that voltage sweep on the DVOM as you move the throttle
You could also do it the easy way (Fords way) with a NGS and just read the TP PID
Thread Starter
|
Cross-Country
Joined: Dec 2022
Posts: 57
Likes: 3
The backprobe procedure (I use a ground flat paperclip with my DVOM)
The orange wire should be reference voltage and have 5 volts
The green wire (signal return) is the one that changes with throttle position and should vary between .8 and 4.5volts
You watch that voltage sweep on the DVOM as you move the throttle
You could also do it the easy way (Fords way) with a NGS and just read the TP PID
The orange wire should be reference voltage and have 5 volts
The green wire (signal return) is the one that changes with throttle position and should vary between .8 and 4.5volts
You watch that voltage sweep on the DVOM as you move the throttle
You could also do it the easy way (Fords way) with a NGS and just read the TP PID
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5th Wheeling
Joined: Mar 2023
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You didn't mention if the new part was Motorcraft or just aftermarket. I STRONGLY recommend replacing it with factory. I've seen many new aftermarket position sensors WAY out of spec right out of the box. This ends up creating erratic idle, shift problems (e4OD), and crappy throttle response on something that you thought was in-and-done.
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Lead Driver
Joined: Jun 2021
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You didn't mention if the new part was Motorcraft or just aftermarket. I STRONGLY recommend replacing it with factory. I've seen many new aftermarket position sensors WAY out of spec right out of the box. This ends up creating erratic idle, shift problems (e4OD), and crappy throttle response on something that you thought was in-and-done.
Hotshot
Joined: Jul 2020
Posts: 10,529
Likes: 2,657
From: Near Salt Lake City
Well, you should then just replace the TP sensor and your code and symptom will go away?
Good luck in school
You are smart enough to try and figure out your truck which is smarter than us all
Means you are no idiot
Good luck in school
You are smart enough to try and figure out your truck which is smarter than us all
Means you are no idiot
Thread Starter
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Cross-Country
Joined: Dec 2022
Posts: 57
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Haha thank you
Lead Driver
Joined: Jan 2019
Posts: 5,081
Likes: 865
From: N.W. Alabama
Make sure they gave you the correct one, first by looking at old one, and seeing where connector is clocked, it matters, one for v8 would hunt for idle, that I6 gulps more air, than a small block IAC and cant keep up.
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