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 MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 94 (ENGINE CONTROLS REMOVAL & INSTALLATION)IGNITION SYSTEMSIGNITION COILREMOVAL (2.4L)

1999 GMC Forward Control 5.7 R, Automatic

Removal (2.4L)

1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal (2.4L)

WARNING: This page is about a different car, the 2002 Pontiac Sunfire and 2002 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

Ignition coils are located in the Ignition Control Module (ICM) housing, attached inside the camshaft housing. See Fig 1. Turn ignition off. Disconnect negative battery cable. Remove the accelerator cable from the hold down clip. Remove the cruise control cable (if equipped). Remove the bolt from the fuel line retainer clip. Disconnect the 11-pin harness connector to the ICM.

Fig 1: Locating Ignition Control Module Housing (2.4L)
Courtesy of GENERAL MOTORS CORP.
Remove camshaft housing bolts. Turn camshaft housing over. Remove ICM screws. Remove ICM. Remove the screws that retain the ICM housing to the camshaft housing. Disconnect the coil harness connector from the ICM. Remove the ICM housing from the camshaft housing. Remove ignition coils from the ICM housing. See Fig 2. Disconnect ignition coil harness connectors. Remove the contact springs from the ICM housing. See Figure. Remove the ignition coil seals from the ignition coils.

Fig 2: Removing Ignition Coils From ICM Housing (2.4L)

Courtesy of GENERAL MOTORS CORP.

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.