TPS Problem with VERY HIGH Idle
TPS Problem with VERY HIGH Idle I just took the SS out of storage and am having some issues. With the TPS plugged in, the throttle will shoot to 3000+ RPM, but when it is unplugged, the idle will go back down to ~1100 RPM. With it unplugged, the rpms will hang after accelerating for a few seconds. This is driving me crazy, as I just want to go for a joy ride after a long winter. Anyone have experience with a similar problem? I don't want to just start throwing parts at the issue to see if it will go away.
Is it idling at 3000? Or if you touch the throttle it goes to 3000 and stays there? 3000 seems awfully high if the IAC was screwed up. But the IAC might be screwed up. Can you check voltages on the IAC and TPS?
Try to get some leads on the IAC and TPS and read the voltage if you can (or if you have HPT or EFILive you can read through the scanner). The TPS only informs the PCM of throttle position. The IAC actually controls airflow into the motor with the TB closed. So to me, it sounds more like a short-circuit in the TPS that's affecting the IAC.
As a point of reference, the IAC, MAF, and MAP are all on the same circuit. All should have a 5V reference at key on, engine off. So you should check to make sure there is no short. The ABS module is on the same circuit as the TPS, and I had a short in my ABS module that sent my TPS apeshit.
Try to get some leads on the IAC and TPS and read the voltage if you can (or if you have HPT or EFILive you can read through the scanner). The TPS only informs the PCM of throttle position. The IAC actually controls airflow into the motor with the TB closed. So to me, it sounds more like a short-circuit in the TPS that's affecting the IAC.
As a point of reference, the IAC, MAF, and MAP are all on the same circuit. All should have a 5V reference at key on, engine off. So you should check to make sure there is no short. The ABS module is on the same circuit as the TPS, and I had a short in my ABS module that sent my TPS apeshit.
