Now that it doesn't start again, check for both fuel pressure and for spark. If both are missing, look at the crankshaft position sensor or camshaft position sensor. When their pulses are missing, the engine computer turns off the Automatic Shutdown (ASD) relay which sends current to the injectors, coil(s), and fuel pump or pump relay.
As for the low power, 5-year old gas is stale and will reduce performance. Also, after the battery was dead or disconnected, the engine computer will request fuel metering based on factory-programmed initial values. As you drive, the computer will make adjustments called short term fuel trims to produce the least emissions possible. As the computer continues to use the same values, it puts them into the long-term fuel trims. These are the values the computer will use the next time you start the engine. The long-term (LTFT) are an indication of how much the computer is modifying fuel delivery beyond the pre-programmed starting values. The STFT are a better indication of what's going on right now. The longer you drive the vehicle, the more the fuel trims will stabilize and the car will run better.
Tuesday, August 11th, 2009 AT 4:23 AM