Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 5 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 6.6L (LMM) - INTRODUCTION (2 OF 2))REPAIR INSTRUCTIONSFUEL INJECTOR REPLACEMENT (LEFT)FUEL INJECTOR CLEANING AND INSPECTION

2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Fuel Injector Cleaning and Inspection

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Fuel Injector Cleaning and Inspection

WARNING: This page is about a different variant/trim than selected.

IMPORTANT: If reusing the old injectors perform the following:

Fig 1: View Of Fuel Injector Nozzle Tip & Copper Washer Sealing Area

Courtesy of GENERAL MOTORS CORP.

Use a soft bristle non-metallic brush and Top Engine Cleaner, GM P/N 1052626 or equivalent, to remove any deposits from the nozzle tip (1) and the copper washer sealing area (2) before re-installation.
Inspect the fuel injector nozzle tip (1) for any signs of discoloration (dark yellow, tan or blue) due to excessive heat.
Replace the injector if any damage is found.

Fig 2: View Of Fuel Injector Sealing Surfaces

Courtesy of GENERAL MOTORS CORP.

Clean the fuel injector high pressure line.
Inspect the fuel injector line for excessive corrosion or damage to the sealing surfaces (1, 2). Replace the line if any damage is found.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.