Once the Check Engine light turns on there will be a diagnostic fault code stored in the Engine Computer. Many auto parts stores will read them for you for free. Those will indicate the circuit or system that needs further diagnosis.
You can get an idea of the cause of cutting out by how it acts. If you're losing spark to one cylinder you'll feel the misfire but the engine will stay running. If you're losing spark to all cylinders the engine will stop and start quickly as in turning a switch on and off. If it's a fuel-related problem the engine will lose and regain power gradually. That can happen in fractions of a second but it feels different than when losing spark.
You may need to have a mechanic attach a mechanical fuel pressure gauge to see if that's the cause of the cutting out. If low fuel pressure is found the likely cause would be a plugged pickup screen in the gas tank or possibly a plugged fuel filter. You'll get a clue from the stored fault code. The fuel supply system is not monitored so the fault code(s) won't make reference to that but they may be related to the results of that low pressure.
Monday, July 22nd, 2013 AT 11:42 AM