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79 280zx n/a runs rich with no power after 1/4 throttle

2.3K views 26 replies 6 participants last post by  RightHandriver  
check the plugs, if fouled and black smoke coming out. prob rich, check the CHTS, make sure it matches the resistance/temp curve in the FSM, check it at the ECU connector. Make sure you disconnect the battery and the key switch is off before disconnecting the ECU connector. Do not mess up the connector by pressing too hard to get a reading, use a thin wire that is just tight enough to fit.

if resistance values are wrong, you will need to start by checking the sensor and then the wiring. Look for corrosion.


Whenever disconnecting or connecting the 35 pin connector, ign off, battery disconnected.
 
other things to check, pinch off the CSV line or just pull it and see if its leaking. I did not see a vacuum line on the aftermarket fuel pressure regulator. It needs it so the fuel pressure tracks with the vacuum. the FSM explains all this.