Checks
| Action
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DEFINITION: The
engine cranks normally, but does not start in a normal amount of time. The
engine does eventually run, or may start but immediately
dies.
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Preliminary Checks
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| • | Make sure the vehicle's operator is using the correct starting
procedure. |
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Sensor Checks
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| • | Check the engine coolant temperature (ECT) sensor with the scan
tool. Compare the ECT with the ambient air temperature on a cold engine.
If the coolant temperature reading is more than 5 degrees
more or less than the ambient air temperature on a cold engine, check
for a high resistance in the coolant sensor circuit. |
| • | Check the throttle position (TP) sensor. If a sticking throttle
shaft or binding linkage causes a high TP sensor voltage open throttle indication,
the control module will not control the idle. While monitoring
the TP sensor voltage, the scan tool should display less
than 0.85 volt with the throttle closed. |
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Fuel System Checks
|
| | Important: A damaged in-tank fuel pump check valve will allow the fuel in the lines
to drain back to the tank after the engine stops.
|
| • | Check for water contamination in the fuel. |
|
Ignition System Checks
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| • | Check for the proper ignition voltage output with J 26792
Spark Tester or the equivalent. |
| • | Check the spark plugs for the following conditions: |
| • | Check for bare or shorted ignition wires. |
| • | Check for moisture in the distributor cap if applicable. |
| • | Check for loose ignition coil connections. |
| • | Check for loose ignition control module connections. |
| • | Check for a damaged control module or ignition system grounds. |
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Engine Mechanical Checks
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| • | Check for the following: |
| - | Broken or weak valve springs |
| • | Check the intake and exhaust manifolds for casting flash. |
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Additional Check
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