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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 87 (ENGINE CONTROLS - REMOVAL, OVERHAUL & INSTALLATION)IGNITION SYSTEMSIGNITION COIL(S)INSTALLATION
1999 GMC Forward Control 5.7 R, Automatic

Ignition Coil(S): Installation

1999 GMC Forward Control 5.7 R, AutomaticSECTION Installation
WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue and 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: DO NOT re-install any component that has visible signs of damage. Inspect the boots for a missing or damaged internal spring. Ensure that the boots are installed right-side up. Ensure that the ignition cassette-to-cam cover ground spring is in place. Repair a torn perimeter seal with an RTV sealant. Clean all the mounting surfaces before re-installing any components.
  1. Install ICM on the ignition coils. Install the ICM retaining screws. Tighten the retaining screws to specification. See TORQUE SPECIFICATIONS . Install the cover on the ignition coils. Install the boots on the ignition coils until the boots bottom out.
  2. Install the cassette assembly straight down onto the spark plugs. If this is not possible on the rear bank due to space limitations, just-start the boots onto the spark plugs, and then align and start the ignition coil towers into the boots. Press the ignition cassette down on the plugs as straight as possible.
  3. Install the 7 bolts that retain the ignition coil cassette to the valve cover. Tighten the bolts to specification. Connect the electrical connector to the ICM. If the oil level indicator tube was moved during disassembly, move the tube back into position and install the retaining bolt. Tighten the retaining bolt to specification.
  4. Keeping the injector sight shield as level as possible, place the rear of the shield under the mounting bracket. Align and press the injector sight shield onto the mounting studs. Install the mounting nuts onto the mounting studs. Tighten the mounting nuts to specification.
Fig 1: Identifying ICM & Ignition Coils (3.5L)
G00112784Courtesy of GENERAL MOTORS CORP.


  1. Ensure the ignition cassette grounding spring and the insulator are in place when installing the ignition cassette. Connect the spark plug boots to the spark plugs. Carefully install the ignition cassette.
  2. Install the ignition cassette retaining bolts. Tighten ignition cassette retaining bolts in sequence to specification. See Fig 4. See TORQUE SPECIFICATIONS .
  3. Install the AIR shut off valve. Reconnect the AIR vacuum control solenoid valve harness connector. Reconnect the ignition cassette electrical connector. Install the fuel injector sight shield.
Fig 1: Locating Engine Controls In Engine Compartment (4.0L - Bank 1 Shown)
G00053814Courtesy 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.