Uplander FWD V6-3.5L VIN L (2006)
Valve Spring: Customer Interest
Engine - MIL ON/DTC P0300/Stumbles/Hesitates
Bulletin No.: 05-06-01-036A
Date: January 23, 2006
TECHNICAL
Subject:
LX9 Intermittent DTC/MIL P0300 or Engine Stumble/Hesitation at 5400 RPM or Higher Prior to Transmission Upshift (Replace All Valve Springs with
Updated Part Number)
Models:
2005-2006 Buick Terraza
2005-2006 Chevrolet Uplander
2005-2006 Pontiac Montana SV6
2005-2006 Saturn Relay
with 3.5L V-6 Engine (VIN L - RPO LX9)
Attention:
The updated valve springs will only address the above described conditions and will not address other issues like idle quality, fuel economy, or
performance.
Supercede:
This bulletin is being revised to add the Saturn Relay model. Please discard Corporate Bulletin Number 05-06-01-036 (Section 06 - Engine/Propulsion
System).
Condition
Some customers may comment on an intermittent "Service Engine Soon" (U.S.) or "Check Engine Soon" (Canada) malfunction indicator lamp (MIL). A
DTC P0300 may be stored and/or engine stumble/hesitation at 5400 RPM or higher experienced prior to transmission upshift.
Cause
This condition may be due to the engine intake and/or exhaust valve springs floating at 5400 or higher RPM.
Correction
Important:
The new valve springs, P/N 12599294, will only address the above described bulletin concerns. DO NOT install the new valve springs unless the
customer comments match the bulletin concern completely. If the customer comments are not a complete match, then continue on with your
diagnosis.
A new engine stiffer valve spring has been released to correct the above condition only. Dealers should install all twelve valve springs with P/N
12599294. Refer to and copy all of the appropriate section(s) of the published service information (SI) before attempting this repair.
Parts Information
Warranty Information
