Checks
| Action
|
DEFINITION: Engine cranks OK, but does not start for a
long time. Does eventually run, or may start but immediately dies.
|
Preliminary
|
| • | Refer to Important Preliminary Checks Before Starting in
Symptoms
. |
|
Sensor/System
|
| • | Check the operation of the column lock system. |
| • | Inspect the engine coolant temperature (ECT) sensor for being
shifted in value. |
| 2. | Compare the ECT 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. |
| 3. | If the ECT sensor is out of range with the IAT sensor,
test the resistance of the ECT sensor. Refer to Temperature vs Resistance
for resistance specifications.
|
| 5. | 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.
Install the MAF in the proper direction.
|
| • | Test the camshaft position (CMP) sensor performance. A long engine
crank time occurs if the PCM does not receive a CMP signal. |
|
Fuel System
|
| • | A malfunctioning check valve in the fuel feed rear pipe allows
the fuel in the lines to drain back to the tank after the engine stops. To
test for this condition, refer to
Fuel System Diagnosis
. |
| • | Inspect both injector fuses for being open. An open injector
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. |
|
Ignition System
|
| • | Remove the spark plugs and inspect for the following conditions: |
| • | Refer to one of the following procedures: |
| - | Spark Plug Visual Diagnosis |
| • | Determine the cause of the fouling before replacing the spark
plugs if the spark plugs are gas, coolant or oil fouled. Refer to one of
the following procedures. |
| - | For diagnosis of coolant or oil fouled spark plugs, refer to
Spark Plug Visual Diagnosis. |
| • | Inspect for bare or shorted ignition wires. |
|
Engine Mechanical
|
| • | Excessive oil in combustion chamber-Leaking valve seals. |
| • | Low cylinder compression |
| • | Combustion chambers for excessive carbon buildup -- Clean
the chambers using top engine cleaner. Follow the instructions on the can. |
| • | For incorrect basic engine parts, inspect the following: |
| • | Refer to one of the following procedures in Engine Mechanical: |
| - | For incorrect cylinder heads, refer to Cylinder Head Replacement
- Right or to Cylinder Head - Left. |
| - | For an incorrect camshaft, refer to Camshaft Replacement. |
| - | For incorrect pistons, connecting rod, and/or bearings, refer
to Piston, Connecting Rod , and Bearing Removal. |
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