Checks
| Action
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DEFINITION: A mild to severe ping which is usually worse upon acceleration.
The engine makes sharp metallic knocks which change with the throttle opening.
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Preliminary Checks
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| • | Make sure the vehicle has an actual problem. |
| • | Check the fuel quality. |
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Cooling System Checks
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| • | Check for a low engine coolant level. |
| • | Check for a loose water pump belt. |
| • | Check for restricted air flow through the radiator, or restricted coolant
flow. |
| • | Check for a malfunctioning or incorrect thermostat. |
| • | Check for a correct coolant solution. The solution should be a 50/50
mix of anti-freeze and water. |
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Sensor Check
| Check the engine coolant temperature (ECT) sensor. Use the scan tool in order
to compare the engine coolant temperature 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 or the sensor itself.
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Fuel System Checks
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Engine Mechanical Checks
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| • | Check for incorrect basic engine parts such as the cam, the heads, the
pistons, etc. |
| • | Check for any excessive oil entering the combustion chamber. |
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Additional Checks
| Check the Service Bulletins for control module software updates.
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