Thread: Kinda Long..But I need help

Just because there is a Lean 02 code doesnt mean the 02 sensor is bad. Bank 1 is the only bank there is on a 3800 car and it will display Bank 1 sensor 1 OR bank 1 sensor 2. Sensor 2 is the after-cat 02 sensor which has no effect on fueling and is just used to tell the pcm that the cat is working properly after the engine and cat have warmed up. If your maf sensor is dirty and not reading correctly it will cause the car to run lean, ANY lean condition can cause the code to turn on, not because the sensor is bad. A lean condition is the result of a problem, it doesnt mean you need to throw parts at the car that wont fix it. When you first start the car it runs in open loop anyways and doesnt read the 02 sensor until the engine warms up and the closed loop delay VS coolant temp in the pcm file has been satisfied. I agree though that it sounds like it is definately running too rich at startup and fuel fouling will cause the car to have a misfire, and a misfire is the only code that will cause the SES light to blink. If you have a weak ignition and it isnt allowing the car to start up when you crank then you are going to be dumping fuel into the cylinders and makes it harder to start. The fact that you have a lean code is pointing to other problems though which could be minor or major. The very common sources of vacuum leaks on your engine are throttle body gasket, supercharger gasket, lower intake gaskets, cracked plastic vacuum lines, bad evap lines. If you dont know the history of the spark plugs you should at least pull them out for an inspection. Since your problem is intermittent I would definately check out the ignition system components, check grounds, check for corrosion on coil terminals, check wiring harness on front of engine to make sure it isnt damaged.