HIGHER THAN NORMAL ENGINE IDLE (REPLACEPCV HOSE). GMC Truck S15 Pickup

SUBJECT: HIGHER THAT NORMAL ENGINE IDLE (REPLACE PCV HOSE)

MODELS: 1994-95 CHEVROLET AND GMC TRUCK S MODELS WITH 2.2L ENGINE (VIN 4 - RPO LN2)

CONDITION:

SOME CUSTOMERS MAY COMMENT THAT THE ABOVE VEHICLE HAS A HIGHER THAN NORMAL ENGINE IDLE. THIS CONDITION SHOULD BE MOST NOTICEABLE DURING HOT IDLE WITH THE AIR CONDITIONING OFF. THE IDLE MAY BE FROM 300- 400 RPM ABOVE NORMAL IN PARK OR NEUTRAL WITH A 5 SPEED MANUAL TRANSMISSION.

CAUSE:

THE PCV HOSE BECOMES DISCONNECTED AND CAUSES A VACUUM LEAK.

CORRECTION:

REPLACE THE PCV HOSE WITH GM PART NUMBER 24575743.

PERFORM DIAGNOSTICS FOUND IN THE DRIVEABILITY, EMISSIONS AND ELECTRICAL DIAGNOSIS MANUAL. MAKE ANY ADJUSTMENTS THAT ARE REQUIRED, OR REPLACE ANY INOPERATIVE PARTS.

IF THE PCV HOSE HAS BEEN FOUND TO BE DISCONNECTED DURING THE VISUAL INSPECTION, REPLACE THE HOSE WITH PART NUMBER 24575743.

REFER TO SECTION 11 IN THE APPLICABLE DRIVEABILITY, EMISSIONS AND ELECTRICAL DIAGNOSIS MANUAL FOR THE PCV HOSE REPLACEMENT PROCEDURE.

PARTS INFORMATION USE PART NUMBER 24575743

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION FOR VEHICLES REPAIRED UNDER WARRANTY USE: LABOR OPERATION: J6020

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.