Inspection/Test
| Action
|
DEFINITION: Engine cranks OK, but does not start for a long time. Does eventually
run, or may start but immediately dies.
|
Preliminary
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|
Sensor/System
|
• | Verify that the engine coolant temperature (ECT) sensor is not shifted
in value. Connect a scan tool. Compare the engine coolant temperature to 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, measure the resistance of the ECT sensor. Refer to
Temperature Versus Resistance
for resistance specifications. |
• | Inspect the mass air flow (MAF) sensor installation. A MAF sensor that
is incorrectly installed may cause a hard start. Important: The embossed arrows on
the MAF sensor indicate the direction of the intake air flow. The arrows must point
toward the engine. Install the MAF in the proper direction. Refer to
Mass Airflow Sensor/Intake Air Temperature Sensor Replacement
. |
• | Inspect the camshaft position (CMP) sensor for proper mounting and/or
a bad connection. An extended crank occurs if the PCM does not receive a CMP signal. |
|
Fuel System
|
• | 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
. |
• | Verify that both fuel injector fuses are not open. An open fuel injector
fuse causes four injectors and four ignition coils not to operate. Inspect the injector
circuits and the ignition coil circuits for an intermittent short to ground. Replace
the fuse. Refer to
Circuit Testing
in Wiring
Systems. |
|
Ignition System
|
• | Verify that both fuel injector fuses are not open. An open fuel injector
fuse causes four ignition coils and four fuel injectors not to operate. Inspect the
ignition coil circuits and the fuel injector circuits for an intermittent short to
ground. Refer to
Circuit Testing
in Wiring
Systems. Replace the fuse. |
• | Remove the spark plugs and inspect for the following conditions: |
• | Determine the cause of the conditions before replacing the spark plugs. |
|
Engine Mechanical
| Inspect for the following conditions:
• | Combustion chambers for excessive carbon buildup--Clean the chambers
using top engine cleaner. Follow the instructions on the can. |
• | Incorrect basic or worn engine parts--Inspect the following: |
Refer to Engine Mechanical.
|