muskiemike
Well-known member
Hello,
Have a 1984 Corvette, with 35K on it, have had the car for 29 years, always garaged and maintained.
About 200 miles ago, the car started to have a fast idle at a cold start up (1500 RPM's) - when the car was operating at normal temps (180* coolant). (900 RPM)
Then the idle would kinda come back to normal. (900 rpm)
Yesterday, I got an "Check Engine" light, so I pulled the ECM code, and it was 21, "Throttle Position Sensor" (TPS).
With the battery disconnected, I disconnected the 3 pin connector to the TBS- the (3) wires lead looked clean, as well as the 3 pin connector, I did clean these 3 pin connector - let it dry, then reconnected it back to the TPS, and still the Check Engine light went on, shortly after I started the car.
So I am wondering, what would happen if I disconnected the 3 pin connector that connects to the TPS? What impact would that have on running the car?
Also there's a metal pedal that is part of the TPS, with the car running, I pushed down on the metal pedal, and it did "not" change the idle speed. What the purpose of this TPS metal pedal? (see attachment - where the red arrow is at.)
In reading the FSM, it says that if the TPS is replaced that the TPS and both Intake Air Control's (IAC), have to be calibrated with a voltage meter- is this correct?
Again, the ECM error code is 21, (Throttle Position Sensor TPS) - could it be some other problem other than the TPS?
In advance, thanks and all comments are welcomed.
Mike
Have a 1984 Corvette, with 35K on it, have had the car for 29 years, always garaged and maintained.
About 200 miles ago, the car started to have a fast idle at a cold start up (1500 RPM's) - when the car was operating at normal temps (180* coolant). (900 RPM)
Then the idle would kinda come back to normal. (900 rpm)
Yesterday, I got an "Check Engine" light, so I pulled the ECM code, and it was 21, "Throttle Position Sensor" (TPS).
With the battery disconnected, I disconnected the 3 pin connector to the TBS- the (3) wires lead looked clean, as well as the 3 pin connector, I did clean these 3 pin connector - let it dry, then reconnected it back to the TPS, and still the Check Engine light went on, shortly after I started the car.
So I am wondering, what would happen if I disconnected the 3 pin connector that connects to the TPS? What impact would that have on running the car?
Also there's a metal pedal that is part of the TPS, with the car running, I pushed down on the metal pedal, and it did "not" change the idle speed. What the purpose of this TPS metal pedal? (see attachment - where the red arrow is at.)
In reading the FSM, it says that if the TPS is replaced that the TPS and both Intake Air Control's (IAC), have to be calibrated with a voltage meter- is this correct?
Again, the ECM error code is 21, (Throttle Position Sensor TPS) - could it be some other problem other than the TPS?
In advance, thanks and all comments are welcomed.
Mike