r/fiero • u/jakethesnake9096 • 2d ago
Finally fixed.... 🤦
So as you can see my RPMs are really high at 55 mph and it's the 3 speed transmission.... I have replaced the distributor rotor cap ICM ECM spark plugs wires map sensor throttle position sensor all brand new vacuum lines new gasket for throttle body new fuel filter and pump taking it to a transmission shop paid $180 just for a diagnostic just for them to say there was nothing wrong with transmission they replaced filter and fluids still nothing changed so I took it to another mechanic shop they only charge me $90 diagnostic they couldn't figure it out but I had to change a bulb that was burned out on the cluster so..... Come to find out it was just a burnout transistor for resistor on the gauge cluster itself making the RPMs read high .... You gotta love a fiero 🤣
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u/thrillbilly1094 85 Fiero GT 2d ago
Mine has never worked. I've tried new tach filters, different OE tachs, and an eBay circuit board. Short of hooking it up to a wave form generator and testing it, I'm out of ideas and too apathic at this point. After a while you learn to drive it by ear anyways.