Engine - Ticking Noise on Cold Start Up: Overview
File In Section: 06 - Engine/Propulsion SystemBulletin No.: 01-06-01-005
Date: January, 2001
TECHNICAL
Subject:
Cold Engine Tick Noise
(Replace Pistons)
Models:
2000-01 Buick Century
2000-01 Chevrolet Lumina, Malibu
2000-01 Pontiac Grand Prix
with 3.1L Engine (VIN J - RPO LG8)
Condition
Some customers may comment on a ticking noise (similar, but not related to valve or lifter noise) that occurs 10-15 seconds after a cold engine start. The noise will last for 1 to 2 minutes, and will fade as the engine reaches operating temperature.
Cause
The noise may be caused by excessive piston to bore clearance during cold engine operation resulting from the specific piston design used in cylinders 1 through 4.
Correction
Service pistons for cylinders 1 through 4 will now be of the same design of those used for all production 2000 and 2001 for cylinders 5 and 6, and will have polymer coated piston skirts. Pistons in cylinders 5 and 6 are not exhibiting the described noise condition.
Important:
^ Note that this is a customer annoyance issue, and does not affect the durability or life of the engine.
^ Removal of pistons from engine cylinders 5 and 6 is NOT necessary if equipped with polymer coated pistons. It is recommended to rotate the crankshaft until the piston skirt is exposed in the lower crankcase area for inspection. Replace pistons in engine cylinder positions 5 and 6 ONLY if there is evidence of damage to the polymer coating on the piston skirt, or scoring on the cylinder wall (heavy scratches) is evident. Detailed diagnosis of cylinder wall/piston skirt wear is discussed in step 4.
Repair Procedure
Tools Required
^ J 24086 Connecting Rod Press
^ J 24086-C Piston Pin Remover/Installer
^ Connecting Rod Oven (Rod kiln)
Parts Information
Parts are currently available from GMSPO.
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer