Hey everyone, first of I just want to thank everyone in advance for any ideas you all my have. Anyway here the problem, I have a 85rx7 with a s/5 turbo motor. The motor has stock internals and turbo, msd 6a ignition, msd boost retard, sds EM-3 ecu, msd fuel pump and fuel system that’s more than adequate for the motor, and fuel pressure, boost, air/fuel mixture gauges. The problem is that 75% of the time that I build about 10lbs if vacuum the airfuel gauge will read fuel lean. Its not like a gradual change either, it instantaneous, it will go from the middle part of the rich to full lean. The fuel pressure(according to the gauge) does not drop at all. It seems to raise perfectly 1:1 with the boost. When the car doesn't go lean it runs great, plenty of power. The part that’s stumps me it that the problems seems to be intermediate, I cant see any consistencies. At this point I'm taking any suggestions so let me know what ya think.

-Steve

 

maybe a loose connection in the fuel pump? is that a wideband a/f guage?

 

I check the connections and there all good, and no its just a autometer

 

replace the fuel filter!

 

did you try taking the fuel injectors and having them cleaned that is what my friend did when he is running to rich or lean

 

Ya the injectors have just been cleaned.