280Zone Posted April 10, 2006 Share Posted April 10, 2006 I have been fighting an over rich problem for days now. Ran all of the diagnostics in the service manual and suspected the head temperature sender so I bypassed it by running straight wire across the connector leads. My thoughts was this would equal zero resistance so it should equal normal operating temperature resistance. I have two air/fuel gauges and can see the rich condition creeping up and the temperature rises. Fuel pressure gauge reads right about 38 psi, have vacuum activated AeroQuip fuel pressure regulator and seems to be working perfect when revving engine. Revving engine shows a momentary drop to decent Air/Fuel mixture but when back to idle richness returns? This is a 81 stock rebuilt turbo engine swapped into a 75 280. I have searched and only found one other person with this problem but no solution was posted. I have emailed other poster but it was a very old post. What could I be missing? Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted April 10, 2006 Share Posted April 10, 2006 AFM connector. ECU Connector. O2 Sensor. Quote Link to comment Share on other sites More sharing options...
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