Hi guys,


I installed a Flowtech header (*no AIR), Flowtech y pipe, with Edelbrock SDT exhaust, and fitted a new 3.73 auburn over the last week. (into a 305TPI with 700R4 1992 Z28 Convert)


last night, I finally finished and took her for a ride. (wasn't super impressed with sound after all the work)


took it for a ride, ran well, no codes on a 3-4 mile ride. noticed the coolant line to the TPI throttle body was leaking fluid tightened it and went to sleep.


woke up to bring car to work today, RPMs swelled to 4-5K and threw a code 21 for TPS voltage too high... is this right? I haven't ever had a TPS issue before, and didn't touch the TPS when installing the coolant line, so confused. I will pull a meter and see what it does after work, but wondering if this has ever happened to anyone?


3-4 times a year I will throw a barometric sensor code but goes away after the engine is shut off.


could this be anything particular I need to look for? again, no issues last night, so very weird to throw this code now and be so high on RPM

 

I would say the TPS could have been moved when you were tightening the coolant hose, but if I'm not mistaken I believe the 90-92 models came when a non-adjustable TPS. I think the best move would be this: assuming the 90-92 models have a three wire TPS like previous models, feed paperclips through the back of the harness into the black and blue wires while the harness is connected to the sensor. Turn your key to the "on" position (do not start) and read the voltage. On my 1987, the acceptable voltage is .45-.55 volts. I am semi confident that it would be the same for your 92. Otherwise you can Google the desired voltage for your year. If you do not get this voltage and instead get something much higher and you are unable to adjust the TPS sensor like I think, consider replacing the sensor. (Is it possible coolant got into the sensor?) I don't have much experience with 90-92's but this was my best shot. I hope it helps some.