I need some help diagnosing a problem. Car was running well and then suddenly began running poorly. Wondered if it was a blown head gasket at first. Had a friend look at it and he unplugged the MAF and the car ran better, but still rough. We switched back to the stock MAF and a Turbotweak chip to no avail. No trouble codes, all the sensors are in the right range. Except the O2 sensor is reading about 200 mV and 9.5:1 at idle. The exhaust is black. There is some smoke coming from the engine bay, passenger side.
We've swapped out the MAP, MAF, chips, O2 sensor, coil and module, IAT, cleaned the IAC, new spark plugs and wires. Everything we could think of aside from the crank sensor.
Appreciate any thoughts you may have.
We've swapped out the MAP, MAF, chips, O2 sensor, coil and module, IAT, cleaned the IAC, new spark plugs and wires. Everything we could think of aside from the crank sensor.
Appreciate any thoughts you may have.