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 4 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 4.3L - INTRODUCTION (2 OF 2))REPAIR INSTRUCTIONSSPARK PLUG REPLACEMENTINSTALLATION PROCEDURE

2008 Chevrolet Chevy Express G3500, Van Passenger Extended

Installation Procedure

2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Installation Procedure

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

Fig 1: Identifying Right Side Spark Plugs

Courtesy of GENERAL MOTORS CORP.

Ensure that the spark plug washer is positioned correctly.
Inspect the spark plug gap. Adjust the gap as needed. Refer to Engine Mechanical Specifications .
Install the appropriate right side spark plug (1) into the cylinder head by hand.

NOTE: Refer to Fastener Notice .

Tighten the spark plug.
Tighten: Tighten the plug to 15 N.m (11 lb ft).

Fig 2: Identifying Left Side Spark Plugs

Courtesy of GENERAL MOTORS CORP.

Install the appropriate left side spark plug (1) into the cylinder head by hand.
Tighten the spark plug.
Tighten: Tighten the plug to 15 N.m (11 lb ft).

Fig 3: Identifying Spark Plug Wire Boots & Plugs (Right Side)

Courtesy of GENERAL MOTORS CORP.

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.