Hard Start Diagnostics

NOTE: Hard start issues occur when the engine cranks but does not start for a long time. Engine may also eventually run or may start but immediately die.

Checks	Action
Preliminary Checks	Ensure the user is using the correct starting procedure (if applicable).
Sensor Checks	- Compare the ECT with the ambient air temperature on a cold start. If the coolant temperature reading is more than 10 degrees greater or less than the ambient air temperature, check for high resistance in the ECT sensor circuit. - Check the TPS and foot pedal position sensor connections.
Fuel System Checks	- Check for intake system leakage.
Ignition System Checks	- Check for proper ignition voltage. - Check the spark plugs are properly gapped. - Check the spark plugs for any irregular, wear, cracks, heavy deposits, and burned electrodes.
Engine Mechanical Checks	Check for all of the below items: - Vacuum leaks - Improper valve timing - Low compression - Improper valve clearance - Worn or weak valve springs - Worn camshaft lobes
Exhaust System Checks	- Check the exhaust system for any restrictions and damaged pipes

Table 55. Hard Start Diagnostics Table