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 CARSECTION 143 (ENGINE CONTROLS AND FUEL - 3.5L - INTRODUCTION (2 OF 2))REPAIR INSTRUCTIONSIGNITION COIL 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 car, the 2008 Chevrolet Malibu Classic. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: View Of Ignition Coil

GM1798767

Courtesy of GENERAL MOTORS CORP.

Install the ignition coil.

NOTE: Refer to Fastener Notice .

Install the ignition coil bolts and nuts.
Tighten: Tighten the bolts/nuts to 25 N.m (18 lb ft).

Fig 2: View Of CPA Retainer And HO2S Electrical Connector Rosebud Clip

GM1777179

Courtesy of GENERAL MOTORS CORP.

Install the HO2S electrical connector rosebud clip (1) to the ignition coil bracket.

Fig 3: View Of Spark Plug Wires

GM1798764

Courtesy of GENERAL MOTORS CORP.

Install the right side spark plug wires (2) to the ignition coils.
Install the left side spark plug wires (1) to the ignition coils.

Fig 4: View Of Brake Booster Vacuum Hose

GM1774992

Courtesy of GENERAL MOTORS CORP.

Install the brake booster vacuum hose to the upper intake manifold.
Position the brake booster vacuum hose clamp at the upper intake manifold.

Fig 5: Identifying Engine Wiring Harness Electrical Connectors

GM1774993

Courtesy of GENERAL MOTORS CORP.

Connect the engine wiring harness electrical connector (2) to the ignition coil.
Connect the engine wiring harness electrical connector (1) to the MAP sensor.
Install the intake manifold cover. Refer to Intake Manifold Cover Replacement .

RENDER: 1.0x

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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.