Hard Starting

SYMPTOM DESCRIPTION:

Engine cranks OK, but does not start immediately. Will eventually start and run, but may die shortly after.


POSSIBLE CAUSE ACTION


Starting System Malfunction Check Battery voltage.

Check Alternator output voltage.

Check Starter current draw.




Ignition System Malfunction Scope check Ignition System
SEE Powertrain Management/Ignition System/Testing and Inspection/Oscilloscope Patterns and Waveforms.

Check IGNITION COIL for proper output voltage.

Check SPARK PLUGS for proper spark duration. Remove spark plugs, check for fuel fouled plugs, cracks, wear, improper gap, burned electrodes, or heavy deposits. Replace as necessary.

Check SECONDARY CIRCUIT for abnormal firing Kv, crossfire between spark plugs (distributor cap, spark plug wires), and proper plug wire routing.

Check IGNITION TIMING for excessive spark advance or retard.
SEE Ignition System/ TIMING SPECIFICATIONS



Engine Mechanical Malfunction Perform a compression check, and cylinder leakage test, look for sticking or leaking valves.

Check for VACUUM LEAKS inspect Intake manifold, gasket(s), and hoses.

Check exhaust system for leaks, restriction, or damage.



Emissions Component Malfunction Check EGR valve for binding or sticking in the open position.

Check EGR Transducer for proper operation.


Fuel System Malfunction Check for lean Air-Fuel mixture, O2 Sensor, perform injector balance test, inspect regulator operation (check vacuum line and return hose), check fuel pressure.

Check Fuel Pump for defective check valve.

Check for defective Fuel Pump Ballast Bypass Relay.