Engine Noise Under Load

WARNING: This page is about a different variant/trim than selected.

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 Diagnostic System Check - Vehicle in Vehicle DTC Information. Repair or replace damaged components as required.
Worn, damaged or improperly installed engine flywheel	Inspect the engine flywheel. Inspect the engine flywheel bolts. Inspect the torque converter. Inspect the torque converter bolts. Inspect the crankshaft. Repair or replace damaged components as required.
Worn, damaged or improperly installed torque converter	Inspect the torque converter. Inspect the torque converter bolts. Inspect the engine flywheel. Repair or replace damaged components as required.
Worn, damaged or improperly installed pistons Pistons must be installed with the mark, or dimple, on the top of the piston, facing the front of the engine; piston pins must be centered in the connecting rod pin bore.	Inspect the cylinder bores. Inspect the pistons. Inspect the piston pins. Inspect the connecting rods. Repair or replace damaged components as required.
Worn, damaged or improperly installed connecting rod bearing	Inspect the connecting rods. Inspect the connecting rod bearings. Inspect the crankshaft connecting rod journals. Repair or replace damaged components as required.
Worn, damaged or improperly installed crankshaft bearing	Inspect the crankshaft bearings. Inspect the crankshaft journals. Repair or replace damaged components as required.