TPS problem - ZR-1 Net Registry Forums

Chuck Banks · 08-04-2023

My '92 with 101,600 miles just developed a drivability issue that I think may be related to the TPS. Upon start up with engine cool, throttle response is instant, and car has good power. When engine is fully warmed up, (easy to achieve here in AZ,) there is a hesitation on first pushing the throttle, and it seems to take a moment for the engine to develop full power. If I'm at part throttle and quickly press the pedal, there is no hesitation and car performs as it should. It has also developed a surging when off the throttle and coasting to slow down. If I keep giving it a little throttle when coasting the surge is not as noticeable. The car is not showing any codes, so I'm not sure if it would only show a 21 or 22 code if the TPS was completely inoperable.
I've owned this car for 31 years and done almost all maintenance including new Accel injectors at 92,000 and then new starter at 94,000, and Fuel pumps and sender at 100,000. I think things are just getting old and maybe thats whats causing the driveability issue.
Any thoughts on my failing TPS diagnosis. I don't have a tech 1 so would have to figure out how to set the TPS if I replace it.

Thanks, Chuck

08-04-2023	#1
Chuck Banks Join Date: Nov 2018 Location: Prescott Valley, AZ Posts: 11	TPS problem My '92 with 101,600 miles just developed a drivability issue that I think may be related to the TPS. Upon start up with engine cool, throttle response is instant, and car has good power. When engine is fully warmed up, (easy to achieve here in AZ,) there is a hesitation on first pushing the throttle, and it seems to take a moment for the engine to develop full power. If I'm at part throttle and quickly press the pedal, there is no hesitation and car performs as it should. It has also developed a surging when off the throttle and coasting to slow down. If I keep giving it a little throttle when coasting the surge is not as noticeable. The car is not showing any codes, so I'm not sure if it would only show a 21 or 22 code if the TPS was completely inoperable. I've owned this car for 31 years and done almost all maintenance including new Accel injectors at 92,000 and then new starter at 94,000, and Fuel pumps and sender at 100,000. I think things are just getting old and maybe thats whats causing the driveability issue. Any thoughts on my failing TPS diagnosis. I don't have a tech 1 so would have to figure out how to set the TPS if I replace it. Thanks, Chuck