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.

2004 Chevrolet Impala Base, 3.8 KFACTORY OEM SERVICE PROCEDURE

Installation Procedure

Install the coil assembly (2) to the ignition control module.

NOTE: Refer to Fastener Notice in Cautions and Notices.

Install the ignition coil screws (1).
Tighten: Tighten the screws to 4.5 N.m (40 lb in).
Connect the spark plug wires to the ignition coil that is being serviced.
Connect the negative battery cable. Refer toBattery Negative Cable Disconnect/Connect Procedure in Engine Electrical.

Fig 1: View Of Ignition Coil Module And Module Mounting Bracket

Courtesy of GENERAL MOTORS CORP.

Factory Service Tools

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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.