Question Asked: Engine won't idle on it's on when cold and fluctuates when warn then shuts off.
November 19, 2013, 07:31 PM
Check engine light comes on and trouble code says bad O2 sensor. The sensor has been changed twice. Once the code is erased, the vehicle can sometimes be driven around town for several days before the problem starts again. Now that it's cold in the mornings, the engine won't idle on it on until it's close to operating temperature. Then the engine starts to fluctuates at idle and shuts off. Also, the following has been replaced: EGR valve, MAP sensor, TP sensor, plugs, wires, coil, distributor cap, rotor, the valve next to the charcoal canister, and fuel pump (twice). I also cleaned the engine ground wires.