Engine - MIL ON/DTC P0300/Stumbles/Hesitates
Bulletin No.: 05-06-01-036ADate: 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
For vehicles repaired under warranty, use the table.
Disclaimer