New to site with TPS Code 23 error
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Joined: Nov 2007
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New to site with TPS Code 23 error
I have a 1988 F150, 4x4, 5.8L EFI engine, auto C6, and I scanned it with a reader, got a Code 23 that the TPS is out of range...I just bought this truck 3 days ago and have so far only driven it home and it has sat since then. What should I do with this information I got on the TPS? Should I buy a new one and install it? Is there any adjustments and how is it done oncve a new one is installed? Is it REALLY the TPS or could that code be caused by ANOTHER problem? The truck has about 123K miles on it, also has oil leaking from both valve cover gaskets. THe Code 23 is ths ONLY code read...any info guys / gals? YOu will need to make this simple, I have many years experience working on vehicles, but mostly all old school, not EFI...thanks!!!
I just purchased a new tuneup set (plugs, wires, dist cap, rotor) and will be getting new valve cover gaskets to replace the leaky ones...so if my rough running is from bad wires that will clear it up. But I am concerned about the TPS error...
I just purchased a new tuneup set (plugs, wires, dist cap, rotor) and will be getting new valve cover gaskets to replace the leaky ones...so if my rough running is from bad wires that will clear it up. But I am concerned about the TPS error...
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Joined: Jul 2007
Posts: 3,802
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From: Cape Girardeau MO
Welcome to the site!
My experience with a faulty TPS is that the truck will idle or hold a constant RPM fine, but changes in the throttle will result in very rough running.
Also, the computer has been pretty much spot-on towards identifying faults. Sometimes one has to think a bit on what the fault description is saying. In your case, the computer has flagged that the feedback is not in the range it should be, so I suggest that the TPS is indeed faulty, assuming everything is connected securely.
Changing the TPS is pretty easy. IIRC, have to remove the throttle body as the TPS is on the bottom.
From the Chilton's manual, more or less - Matchmark things so that the new sensor will be set in the exact same position and orientation as the old sensor. Set the new TPS so that the wiring harness is parallel with the venturi bores, then rotate the TPS clockwise until matchmark alignment. Tighten screws to 16 in-lb. When installed correctly, the TPS wiring harness should be pointed directly at the air bypass valve.
My experience with a faulty TPS is that the truck will idle or hold a constant RPM fine, but changes in the throttle will result in very rough running.
Also, the computer has been pretty much spot-on towards identifying faults. Sometimes one has to think a bit on what the fault description is saying. In your case, the computer has flagged that the feedback is not in the range it should be, so I suggest that the TPS is indeed faulty, assuming everything is connected securely.
Changing the TPS is pretty easy. IIRC, have to remove the throttle body as the TPS is on the bottom.
From the Chilton's manual, more or less - Matchmark things so that the new sensor will be set in the exact same position and orientation as the old sensor. Set the new TPS so that the wiring harness is parallel with the venturi bores, then rotate the TPS clockwise until matchmark alignment. Tighten screws to 16 in-lb. When installed correctly, the TPS wiring harness should be pointed directly at the air bypass valve.
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Joined: Nov 2007
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Thanks bunches...I purchased a new TPS, but have not put it on yet...when I do, do I have to do any calibration to the new one, or just attach it as mentioned in your previous post and go for the gold?
I ran a can of SeaFoam through the engine since posting, and it seems to run somewhat better, better throtle response, but I have not driven it but a few miles so cannot brag too much yet. I love that stuff...
If there are no calibrations to be done to the TPS, I will do it very soon, but if there are, I need to know how to do it...thanks!!!!
I ran a can of SeaFoam through the engine since posting, and it seems to run somewhat better, better throtle response, but I have not driven it but a few miles so cannot brag too much yet. I love that stuff...
If there are no calibrations to be done to the TPS, I will do it very soon, but if there are, I need to know how to do it...thanks!!!!
Senior Member
Joined: Jul 2007
Posts: 3,802
Likes: 477
From: Cape Girardeau MO
Shouldn't need any further adjustments - just get the new one in place and lined up the same as the old one. The reason for the set-n-twist directions is to be sure the TPS engages with the butterfly tangs properly.
After all is done, have a look at the butterfly tang & TPS engagement. IIRC, the TPS has a hole through the middle of its sensor ring, which makes things easier. Just be sure that no matter how little the throttle butterflies are moved, the TPS sensor ring is rotating with it. Should not be any free play to speak of.
After all is done, have a look at the butterfly tang & TPS engagement. IIRC, the TPS has a hole through the middle of its sensor ring, which makes things easier. Just be sure that no matter how little the throttle butterflies are moved, the TPS sensor ring is rotating with it. Should not be any free play to speak of.