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1988 CA GT, all stock, 97K miles. Get 11 KOEO and 11 CM, but get 41 and 91 KOER I've methodically done every test I can think of and I can't figure out why I am getting 41 and 91. I've been chasing this for almost a year. During that year, I did all the wiring tests for the O2 sensors and...

Will a EEC from a 94 or 95, like a W4HO, work in a 88-93 Mass Air car that originally had an A9P?

I'm troubleshooting some problems in an 88 gt. I bought a PCED for help. I knew ahead of time that the PCED references the breakout box and provides instructions on how to use the breakout box. I don't have a breakout box, and most of the results can be found by back-probing wire harness...

The car is a bone stock 88 GT in CA. (The car is a CA car, and has a MAF.) I need to smog the car, but have a 91 KOER code (and also a 91 CM code). I tested the o2 sensors, and both tested good. The wiring between the o2 sensors and the ECU tested good. The o2 ground tested good. As the 91...

I just installed a 347 in my Mustang (specs in sig) and I am having a problem getting it to idle correctly. I went through all the "fixes" but none work. I replaced the ECT and ACT sensors today with new sensors from Autozone. I also set base idle and made sure that TPS voltage was at .98 with...

I finally got my motor running. (347, 11.5:1, RPM heads, COMP cam grind #FE XE266HR-12, RPM 1 intake.) I cannot get the thing to idle. I have followed numerous "Fixes" listed on the internet, but none have worked. I am trying to run this combo on the stock ECU. Should I get it tuned and hope the...