TPS Cleaning
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mechanically, nothing goes wrong with it. but electrically, its a variable resistor of some sort that takes a 5 volt ? reference signal and outputs something like .6 volts at idle and higher voltages at more throttle.
i've replaced mine twice.
-once to fix a dead spot in the throttle, also wouldn't hold speed on cruise and downshifted a lot.
-the second time was surging idle that i swore, i mean SWORE was an IAC problem, until it set a CEL P0123, which i kept trying to ignore and finally listened to the pcm, which was right.
i've replaced mine twice.
-once to fix a dead spot in the throttle, also wouldn't hold speed on cruise and downshifted a lot.
-the second time was surging idle that i swore, i mean SWORE was an IAC problem, until it set a CEL P0123, which i kept trying to ignore and finally listened to the pcm, which was right.
#6
This is exactly what happend to my truck. i replaced the iac 2 times and it didnt fix anything. I then cleand the TPS and its worked since. Its not like its hard to do and it doesnt cost anything so its worth a shot.. I didnt think it was going to work eaither but it did and saved me some money. I wouldnt waste time trying it more then once.
#7
To the OP,
You didn't happen to mess with the throttle adjustment screw on the side of the TB, did you?
The reason I ask is because that screw can affect how the engine throttles down after you rev it.
If you close the plates too much, the IAC plays hell and causes the engine to buck and sputter.
Open them too much, and the RPM's will hang and the engine
Won't rev down, which can play hell with you trying to brake against an engine that's still pushing the vehicle.
You didn't happen to mess with the throttle adjustment screw on the side of the TB, did you?
The reason I ask is because that screw can affect how the engine throttles down after you rev it.
If you close the plates too much, the IAC plays hell and causes the engine to buck and sputter.
Open them too much, and the RPM's will hang and the engine
Won't rev down, which can play hell with you trying to brake against an engine that's still pushing the vehicle.
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