Inspections
| Action
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DEFINITION: Engine cranks OK, but does not start for a long time. Does eventually run, or may start but immediately dies.
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Preliminary
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• | Search for bulletins which may address this condition. |
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Sensor/System
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• | Inspect the engine coolant temperature (ECT) sensor for being shifted in value. Connect a scan tool. Compare the engine coolant temperature against the intake air temperature (IAT) on a cold engine. The ECT and IAT sensor values should be within ±
3°C (5°F) of each other. If the ECT sensor is out of range with the IAT sensor, verify the resistance of the ECT sensor. Refer to
Temperature Versus Resistance
for resistance specifications. Replace the ECT sensor
if the resistance is not within the specification. If the sensor is within the specification, repair the ECT signal circuit for high resistance. |
| Important: The embossed arrows on the MAF sensor indicate the direction of the intake air flow. The arrows must point toward the engine.
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• | Inspect the camshaft position (CMP) sensor for proper mounting and/or a bad connection. Refer to
Camshaft Position Sensor Replacement
. A long crank time occurs if the PCM does not receive a CMP signal. |
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Fuel System
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• | A faulty in-tank fuel pump check valve allows the fuel in the lines to drain back to the tank after the engine stops. Refer to
Fuel System Diagnosis
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• | Inspect both ENG 2 and ENG 3 injector fuses for being open. An open fuse causes four injectors and four ignition coils not to operate. Replace the fuse. Inspect the injector circuits and the ignition coil circuits for an intermittent
short to ground. |
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Ignition System
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• | Inspect both ENG 2 and ENG 3 injector fuses for being open. An open injector fuse causes four ignition coils and four injectors not to operate. Replace the fuse. Inspect the ignition coil circuits and the injector circuits for an intermittent
short to ground. |
• | Determine the cause of the fouling before replacing the spark plugs if the spark plugs are gas, coolant, or oil fouled. Refer to
Spark Plug Inspection
for diagnosis of fouled spark plugs. |
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Engine Mechanical
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• | Combustion chambers for excessive carbon buildup--Clean the chambers using top engine cleaner. Follow the instructions on the can. |
• | Inspect the following components for incorrect basic engine parts. Refer to the appropriate procedures in Engine Mechanical: |
• | Inspect for excessive crankshaft endplay that will cause the CKP sensor reluctor wheel to move out of alignment with the CKP sensor. Refer to
Crankshaft and Bearing Cleaning and Inspection
. This could result
in any of the following conditions: |
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