ENG. RUNS ROUGH, MIL ILLUMINATED, DTC P0300. Chevrolet Monte Carlo 1998

SUBJECT: ENGINE RUNS ROUGH, MIL ILLUMINATED, DTC P0300 SET (REPLACE PLUG WIRE)

MODELS: 1997-98 BUICK REGAL 1998 CHEVROLET LUMINA, MONTE CARLO 1998 OLDSMOBILE INTRIGUE 1997-98 PONTIAC GRAND PRIX WITH 3800 OR 3800 SUPERCHARGER ENGINE (VINS K, 1 - RPOS L36, L67)

CONDITION:

SOME OWNERS MAY COMMENT ABOUT A ROUGH RUNNING ENGINE AND THE MIL (MALFUNCTION INDICATOR LAMP) IS ILLUMINATED. AFTER INSTALLING A SCAN TOOL, THE TECHNICIAN DETERMINES THAT DTC (DIAGNOSTIC TROUBLE CODE) P0300 IS SET. TECHNICIAN FURTHER DETERMINES THAT THE SUSPECT CYLINDER(S) HAS A SPLIT BOOT ON THE SPARK PLUG WIRE AT THE SPARK PLUG END OF THE WIRE.

CAUSE:

THE GREASE INSIDE THE SPARK PLUG BOOT MAY DETERIORATE THE RUBBER CAUSING THE BOOT TO SPLIT AND EVENTUALLY MISS DIRECT THE SPARK TO GROUND.

CORRECTION:

1. INSPECT ALL SPARK PLUG BOOTS FOR SPLITTING AT THE PLUG END BY REMOVING THE WIRE FROM THE PLUG AND THEN REMOVING THE CYLINDRICAL HEAT SHIELD FROM THE BOOT. PINCH THE RUBBER BOOT WITH YOUR FINGERS AND VISUALLY INSPECT FOR CRACKS AROUND THE PERIMETER OF THE OPENING.

2. FIELD DATA SUGGESTS THAT CYLINDERS 1, 3, AND 5, (FRONT BANK) ARE MOST LIKELY TO EXPERIENCE THE CONDITION. THEREFORE, IF A SPLIT PLUG WIRE BOOT IS FOUND ON ANY OF THESE CYLINDERS, REPLACE ALL THE WIRES ON THAT BANK WITH NEW WIRES LISTED IN THE PARTS SECTION IN THIS BULLETIN.

**CYLINDERS 2, 4, AND 6 (REAR BANK) ARE TO BE SERVICED INDIVIDUALLY.**

BEFORE INSTALLING THE NEW WIRES ON THE SPARK PLUGS, REMOVE ANY OLD GREASE FROM THE SPARK PLUGS BY WIPING THEM WITH A CLEAN DRY SHOP TOWEL. THE NEW WIRES HAVE AN IMPROVED GREASE THAT WILL NOT DETERIORATE THE SPARK PLUG WIRE BOOT. CLEAR THE DTC P0300 CODE WITH A SCAN TOOL AND VERIFY THAT THE MISFIRE CONDITION HAS BEEN CORRECTED.

3. IF A CRACK IS NOT FOUND OR IF THE MISFIRE CONDITION PERSISTS, THEN FOLLOW DTC P0300 DIAGNOSTIC AIDS IN THE APPROPRIATE SERVICE MANUAL.

PARTS INFORMATION:

PART NUMBER PART NAME APPLICATION

12192153 SPARK PLUG WIRE KIT 3800 VIN K-RPO L36 12192154 SINGLE PLUG WIRE CYL 1 3800 VIN K-RPO L36 12192155 SINGLE PLUG WIRE CYL 2 3800 VIN K-RPO L36 12192156 SINGLE PLUG WIRE CYL 3 3800 VIN K-RPO L36 12192155 SINGLE PLUG WIRE CYL 4 3800 VIN K-RPO L36 12192157 SINGLE PLUG WIRE CYL 5 3800 VIN K-RPO L36 12192158 SINGLE PLUG WIRE CYL 6 3800 VIN K-RPO L36

12192159 SPARK PLUG WIRE KIT 3800 SUPERCHARGER VIN 1-RPO L67 12192154 SINGLE PLUG WIRE CYL 1 3800 SUPERCHARGER VIN 1-RPO L67 12192158 SINGLE PLUG WIRE CYL 2 3800 SUPERCHARGER VIN 1-RPO L67 12192156 SINGLE PLUG WIRE CYL 3 3800 SUPERCHARGER VIN 1-RPO L67 12192158 SINGLE PLUG WIRE CYL 4 3800 SUPERCHARGER VIN 1-RPO L67 12192157 SINGLE PLUG WIRE CYL 5 3800 SUPERCHARGER VIN 1-RPO L67 12192158 SINGLE PLUG WIRE CYL 6 3800 SUPERCHARGER VIN 1-RPO L67

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION DESCRIPTION LABOR TIME J4206 WIRES, SPARK PLUG- USE PUBLISHED LABOR REPLACE ONE OPERATION TIME

ADD A TO REPLACE EACH WIRE USE PUBLISHED LABOR ADDITIONAL WIRE OPERATION TIME

ADD B DIAGNOSIS TIME USE PUBLISHED LABOR OPERATION TIME

J4226 SPARK PLUG - REPLACE USE PUBLISHED LABOR OPERATION TIME

FIGURES: 0 ATTACHMENTS: 0

GENERAL MOTORS BULLETINS ARE INTENDED FOR USE BY PROFESSIONAL TECHNICIANS, NOT A "DO-IT-YOURSELFER". THEY ARE WRITTEN TO INFORM THOSE TECHNICIANS OF CONDITIONS THAT MAY OCCUR ON SOME VEHICLES, OR TO PROVIDE INFORMATION THAT COULD ASSIST IN THE PROPER SERVICE OF A VEHICLE. PROPERLY TRAINED TECHNICIANS HAVE THE EQUIPMENT, TOOLS, SAFETY INSTRUCTIONS AND KNOW-HOW TO DO A JOB PROPERLY AND SAFELY. IF A CONDITION IS DESCRIBED, DO NOT ASSUME THAT THE BULLETIN APPLIES TO YOUR VEHICLE, OR THAT YOUR VEHICLE WILL HAVE THAT CONDITION. SEE A GENERAL MOTORS DEALER SERVICING YOUR BRAND OF GENERAL MOTORS VEHICLE FOR INFORMATION ON WHETHER YOUR VEHICLE MAY BENEFIT FROM THE INFORMATION.