Engine Backfire and Related Driveability Issues – 1999-2002 Chevrolet & GMC B7 School Bus Chassis, C6/C7 Conventional Cab Medium Duty

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NHTSA ID Number: 10195303

Manufacturer Communication Number: TSB-013


Engine Backfire and Related Driveability Issues


This bulletin is being issued to assist technicians in efficiently diagnosing and correcting backfire and other related driveability concerns.

When a vehicle is identified with a backfire it is recommended that the checks listed below be followed in the indicated order.

To properly diagnose and correct a backfire complaint, this bulletin MUST be used with GM Informational Bulletin #02-06-04-026A.


Preliminary Checks

Perform a Diagnostic Circuit check on the vehicle. Verify that the MIL is functioning properly. If the MIL is illuminated, retrieve any DTCs from the PCM and follow the appropriate section of the GM Medium Duty Service Manual. In addition, retrieve any DTCs from the AF ECU by performing the Alternative Fuel On-Board (AF OBD) System Check in the IMPCO LPG Service Manual Supplement.

Important: For model year 1999 vehicles only, verify that the fuel control solenoid (FCS) has been updated with part number 100291 per IMPCO Technical Service Bulletin 99MD-TSB-002.


24 Affected Products


CHEVROLET B7 1999-2002
CHEVROLET C6500 1999-2002
CHEVROLET C7500 1999-2002
GMC B7 1999-2002
GMC C6500 1999-2002
GMC C7500 1999-2002


1 Associated Document

Manufacturer Communications

Bulletin No.: TSB-013
Date: June 2002


MC-10195303-9999.pdf 101.13KB

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