S15/T15 Sonoma P/U 2WD L4-2.2L VIN 5 Flex Fuel (2001)
Valve Cover: All Technical Service Bulletins
Engine - Excessive Oil Consumption
File In Section: 06 - Engine/Propulsion System
Bulletin No.: 01-06-01-030A
Date: May, 2002
TECHNICAL
Subject:
Higher than Expected Engine Oil Consumption
(Replace Rocker Arm Cover)
Models:
1998-2001 Chevrolet Cavalier
1998-2001 Pontiac Sunfire
1998-2001 Chevrolet and GMC S Truck Models
with 4 Cylinder 2.2L Engine (VINs 4, 5 - RPOs LN2, L43)
This bulletin is being revised to correct the warranty information. Please discard Corporate Bulletin Number 01-06-01-030 (Section 06 -
Engine/Propulsion System).
Condition
Some owners may comment on higher than expected engine oil consumption, therefore, having to add oil between oil changes.
Important:
For the LN2 and L43 engines, oil consumption greater than 1 quart (0.9 L) within 2000 miles (3200 km) is considered excessive. The oil
consumption rate should be verified prior to repairs, as per Corporate Bulletin Number 01-06-01-011 dated March, 2001.
Cause
Two potential causes of high oil consumption have been identified:
^
The RTV seal between the stamped aluminum PCV baffle plate and the underside of the engine rocker cover may have deteriorated, allowing
excessive oil mist to intrude into the PCV system.
^
The molded silicone intake manifold side gasket may have deteriorated at the PCV flow orifice, allowing excessive PCV gases to flow into the intake
manifold.
Correction
Follow the guidelines listed under Oil Consumption Diagnosis in the Engine Mechanical section of the appropriate Service Manual, or in SI2000. If
there are no other evident reasons for the concern (such as leaks), replace the rocker cover assembly with the new design cover, P/N 12570563, and
replace the intake manifold side gasket with a new material gasket, P/N 12564499.
Parts Information
Parts are currently available from GMSPO.
Warranty Information
