Engine Noise on Start-Up, but Only Lasting a Few Seconds. Generic Unit Repair 2002

For 1990-2009 cars only

Makes 🢒 Generic 🢒 2002 🢒 Unit Repair 🢒 Engine 🢒 Engine Mechanical - 3.0L (LW9) 🢒 Engine Noise on Start-Up, but Only Lasting a Few Seconds

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 light rattle/tapping noise may indicate a valve train (upper engine) concern, or a low rumble/knocking may indicate a crankshaft or piston (lower engine) concern.

Incorrect oil filter without anti-drainback feature

Install the correct oil filter.

Incorrect oil viscosity

Drain the oil.
Install the correct viscosity oil.

Worn crankshaft thrust bearing

•	Inspect the thrust bearing and crankshaft.

•	Repair or replace as required.

High valve lifter leak down rate

Replace the lifters as required.