Hi all,
I am having a problem. When the engine is slowly revved up to 1.6k rpm, the rpm will automatically go back down to 1.0k rpm. Problem does not exist when engine is quickly revved or when aircon is turned on.
When that occurs, the TPS sensor output seems to be stuck at 0.6V (the voltage should come down to ~0.5V when idling at 1.0k rpm).
I have cleaned the TB and checked the hoses. No problem with the ISC or TPS as i have changed it several times and it is still the same symptom.
I suppose your TPS sensor got a lot of electrical noise. Your ECU may think that you are at idle even you have your throttle slightly open. In this case to 1600RPM. Since you mentioned that your TPS voltage at idle is 0.5v. Try adjusting the TPS slightly to solve the problem. Bring it up to 0.6v at idle and see if that solve your problem.