Hard Start

Verify that the engine coolant temperature (ECT) has not shifted in value. Refer to Temperature Versus Resistance .
Verify the engine electrical system for correct operation. Refer to Symptoms - Engine Electrical .
Verify that the driver is using the correct starting procedure as described in the owners manual.
Verify that there is adequate fuel.
Inspect for excessive crankshaft endplay that will cause the crankshaft position (CKP) sensor reluctor wheel to move out of alignment with the CKP sensor. Refer to Crankshaft and Bearings Cleaning and Inspection .

IMPORTANT: A vehicle with a camshaft actuator stuck in an un-parked position may experience a hard start.

Start and run the vehicle until fully warm. Observe the camshaft position (CMP) variation parameter while accelerating up to 1,500 RPM and back to idle several times. The CMP variation should indicate a value for 1-2 seconds, then return to 0 degree. If the camshaft actuator does not respond, refer to Camshaft Timing Drive Components Cleaning and Inspection (Fourth Design) .