Throttle Position Sensor/Possible Computer Problem
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Senior User
Joined: Sep 2000
Posts: 162
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From: Castine, ME
Throttle Position Sensor/Possible Computer Problem
Hi there, it has been a while since I posted last, but I have a problem that has me and several mechanics stumped.
The truck is a '94 F150 with the six and has a nasty off-idle hesitation so much so that it nearly stalls before the IAC valve can compensate. There are NO vacuum leaks, the EGR valve and EVP are OK and it idles smooth as glass (oh, and no codes). I was certain that the TPS was shot, so I replaced it with no change in symptoms. However, by dumb luck I accidently started the truck without plugging back in the TPS and the problem has vanished! The truck has more power and accellerates better
I was just curious if anyone out there had come across this problem or had any ideas. Currently I am tempted to leave the thing unplugged and drive it as is. I am just concerned about potential problems this may create in the future, not to mention I will never be satisfied until it is fixed correctly.
Thanks,
captntim
The truck is a '94 F150 with the six and has a nasty off-idle hesitation so much so that it nearly stalls before the IAC valve can compensate. There are NO vacuum leaks, the EGR valve and EVP are OK and it idles smooth as glass (oh, and no codes). I was certain that the TPS was shot, so I replaced it with no change in symptoms. However, by dumb luck I accidently started the truck without plugging back in the TPS and the problem has vanished! The truck has more power and accellerates better
I was just curious if anyone out there had come across this problem or had any ideas. Currently I am tempted to leave the thing unplugged and drive it as is. I am just concerned about potential problems this may create in the future, not to mention I will never be satisfied until it is fixed correctly.
Thanks,
captntim
Senior User
Joined: Nov 2002
Posts: 158
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From: Champlin USA
i guess that anytime you make an air/fuel type adjustment you need to disconnect the battery for at least 5 minutes. this tells the computer to relearn the idle, so when you start it back up dont touch the throttle for a while. you may still have to clear any trouble codes stored in the computer.
if your saying that you can rev the engine up and it drives just fine with the TPS diconnected the only thing i can think of is that the engine is in some sort of failure mode where its giving the engine extra fuel. i didnt know that you could run an engine with the TPS diconnected because the computer needs to know where the throttle is to know how much fuel to inject.
are you sure that its the TPS that you bought and have disconnected?
if your saying that you can rev the engine up and it drives just fine with the TPS diconnected the only thing i can think of is that the engine is in some sort of failure mode where its giving the engine extra fuel. i didnt know that you could run an engine with the TPS diconnected because the computer needs to know where the throttle is to know how much fuel to inject.
are you sure that its the TPS that you bought and have disconnected?
