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'm no TPI guru, but I'd guess with the SD system it isn't happy with the improved exhaust flow.

Perhaps a real guru will chime in.

 

This sounds like the most obvious place to start. Coolant leak at TB, and code for faulty TPS which is also on the TB. Coolant shorted it somehow or you hit it installing the headers and it was old enough to just fail upon being disturbed.

Have you ever replaced your TPS?