i've got a 1990 GTU that i have just put a new stage 1 clutch in along with a RB header, pre-silencer and cat elemination (straight pipe/ test pipe), and Borla cat-back exhaust. The car has 75000 miles on the engine and ran great before (except the clutch) and now has problems when accelerating. it seems like whenever it wants a check engine comes on, the RPM gauge hits 0 and it sputters when accelerating. it will still run and what not but it's just not quite right. any suggestions???

 

Pull the codes. Sounds like limp mode.

 

how do i go about pulling fault codes. i'm new to an OBD1 system

 

http://www.johnr.com/cpucodes.html

 

You are probably going to need this as well.

https://www.rx7club.com/2nd-generation-specific-1986-1992-17/s5-mop-ecu-failure-diagnosis-710938/

Good Luck!

 

ok. i have the results of the trouble code reading. one of them i saw coming but the other.... not in a million years. they are codes #2- crank angle sensor (which is why the car only cranks sometimes) and #17 O2 senor (the one i saw coming). Now i have two questions. #1. will the failing O2 sensor cause any real problems #2. what do i do about the intermittently failing crank angle sensor?

 

ok. i ohmed out the crank angle sensor and it checks out. the connector looked very dirty so i cleaned it. big surprise, it still doesn't crank.

 

still no cranking, just clicking. found fried ground wire from top of tranny to fire wall. could cause my prob? either way, it's getting replaced