'87 Sentra, with feedback carb, and duty cycle air/fuel mixture ratio solenoid inside carb. Finally got it running good, good power, good response. But it is now blistering the spark plug insulators white. EGR valve is working, timing at 7 BTDC as called for by hood sticker. Not overheating, not losing coolant. Carb has been professionally rebuilt. New oxygen sensor. I was checking the vacuum sensor (just like a map sensor). Chilton says should be 4 volts to computer for vacuum signal. Mine says almost battery voltage, very close within two tenths of volts. Pulled connector off sensor, key on, I have again near battery voltage from computer to sensor? Chilton is no help further. Question is, does computer send 4 volts to sensor, or battery voltage and sensor is supposed to cut it down to 4 volts? If signal to sensor is wrong, bad computer. Or if battery voltage to sensor is right, bad sensor. Please help. Can anybody find the specs for this. And is this the reason my plugs are blistering white.
have the same problem?
Saturday, May 18th, 2013 AT 4:46 PM