Cause
| Correction
|
|
Important: A cold piston knock which disappears in 1.5 minutes should be considered
acceptable. A cold engine knock usually disappears when the specific cylinder's
secondary ignition circuit is grounded out during diagnosis.
A low rumble/knocking may indicate a crankshaft or piston (lower engine)
concern.
|
Low oil pressure
|
| • | Perform an oil pressure test. Refer to Oil Pressure Diagnosis
and Testing. |
| • | Repair or replace as required. |
|
Detonation or spark knock
| Verify the correct operation of the ignition
controls. Refer to the Engine Controls section.
|
Loose torque
converter bolts or improperly installed torque converter (automatic transmission
only)
|
| • | Inspect the torque converter bolts and flywheel. |
| • | Verify correct installation of the torque converter. |
|
Cracked flywheel (automatic transmission)
|
| • | Inspect the flywheel bolts and flywheel. |
|
Excessive connecting rod bearing clearance
| Inspect the following components,
and repair as required:
| • | The connecting rod bearings |
|
Excessive crankshaft bearing clearance
| Inspect the following components,
and repair as required:
| • | The crankshaft bearings |
| • | The crankshaft journals |
| • | The cylinder block crankshaft bearing bore |
|
