Hard Starting

SYMPTOM DESCRIPTION:
Engine cranks OK, but does not start immediately. Will eventually start and run, but may die shortly after. Check the following systems and components.



COMPUTER INPUTS/OUTPUTS
^ ENGINE SPEED/REFERENCE SENSOR: Damaged or defective engine speed/reference sensor or wheel. Refer to Crankshaft Position Sensor, Testing and Inspection
^ DME CONTROL UNIT: Defective Digital Motor Electronic (DME) control unit.
^ IDLE VALVE: Stuck or partially closed idle valve. Refer to Idle Control Valve, Testing and Inspection



FUEL
^ FUEL PUMP RELAY: Pump should continue to run after the engine has started.
^ WATER CONTAMINATED FUEL:
^ FAULTY FUEL PUMP CHECK VALVE: This could allow the fuel in the lines to drain back to the tank after the engine is stopped.
^ FAULTY FUEL PRESSURE REGULATOR:
Refer to Fuel Delivery and Air Induction, Testing and Inspection



IGNITION
^ Proper ignition output voltage.
^ Spark plugs, wet plugs, cracks, wear, improper gap, burned electrodes or heavy deposits. Bare and shorted wires.
^ Moisture in distributor cap.
Refer to Ignition Systems, Testing and Inspection