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.

SYS.OK|MANUAL.DB● LIVE

HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1342 (ENGINE CONTROL SYSTEM (INTRODUCTION) - 1.8L (LV6))REPAIR INSTRUCTIONSIGNITION COIL(S) REPLACEMENTINSTALLATION PROCEDURE

2003 Chevrolet TrailBlazer 4.2 S, 4WD

Installation Procedure

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Installation Procedure

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Electrical Harness Package, Ignition Coils And Fasteners

Courtesy of GENERAL MOTORS CORP.

Install the ignition coils (3) to the engine.

NOTE: Refer to Fastener Notice in Cautions and Notices.

Secure the ignition coils with the fasteners (4).
Tighten: Tighten the ignition coil fasteners to 9 N.m (80 lb in).
Install the electrical harness (2) and secure with the 2 fasteners (1).
Tighten: Tighten the fasteners to 8.8 N.m (78 lb in).
Connect the electrical connectors to the ignition coils (3).

Fig 2: View Of Engine Top Cover, Plastic Retainers And Fasteners

Courtesy of GENERAL MOTORS CORP.

Install the engine cover (1).
Secure the engine cover (1) with the 2 fasteners.
Tighten: Tighten the 2 fasteners to 9 N.m (80 lb in).
Install the 2 plastic retainers.

RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready Tools Free Quote Check Quote Shield Pro

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.