my900ss

I have new injectors on order. I am still looking for where and how to adjust the air fuel mixture, but I have yet been unable to locate a mixture adjust screw or instructions on the suggested means to do so. Any input or guidance on the where and how? Thanks, Troy

Had he found the title yet? You might also look at the 260z's as they have carbs the same as the 240z and no smog. There is a white one in Davis, I did not get a chance to look at it but it may be in better shape than the blue 240z

Injectors would seem like a logical step given the symptom. However they have good continuity and using the screw driver test I can hear them pulsing. When I get to it I will most likely swap the #3 and #6 injector to see if the sooting issue follows the injector and then replace if needed.

If it is the blue one on Craig's list I looked at it about a week ago. It starts and runs ok, the interior is not in good shape however, it also has some vacuum issues related to putting the car in reverse, the paint is in far worse shape than the photo's depict and the owner did not have the title when I looked at the car. The guy selling the car was easy going and low key so no issues there, good luck in finding your car.

I am going to give the BK44 fuel system cleaner a try. I have been pulling and spraying contact cleaner in the sensor connections as I come across them. The attached jpg shows the relay I am looking for on the schematic. My hunt for the air fuel mixture screw continues, I will look into the possibility it is in the AFM. Another semi simple question... the 4 fusable links on the inside fender well just forward of the battery. What amperage are they rated at? Thanks, Troy

Thanks for the compliment. I choose to buy this car because it was a clean unmolested example. I would prefer to fix the issue vs. fool the emissions.

1977 280Z 5spd is failing the CA emissions test for both HC and C0. The 5 & 6 cylinder plugs appear to be running much richer than 1-4 due to black soot on these two plugs not found on the other 4. Compression reads between 130psi and 135psi across all 6 cylinders. I have replaced the plugs, plug wires, rotor, distributor cap, coil, fuel filter and EGR valve. I ran through the "poor mileage" xblshooting section of the 280z service manual and everything passes except the air regulator DC voltage check. A. A continuity check at the sensor on the air regulator tests good. B. When I initally pulled the vacuum lines from the regulator I could see the valve was 1/2 open. After running the car, I pull the vacuum lines and the valve is closed. Looking through the fuel injection bible pdf on page 56 Test #1 - (8) there is a part labeled "Relay". Where is this physically on the car? I am looking for where and how to adjust the air fuel mixture, but I have yet been unable to locate a mixture adjust screw or instructions on the suggested means to do so. Any input or guidance on the where and how? Thanks, Troy