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 231 (ENGINE CONTROLS - REMOVAL & INSTALLATION)IGNITION SYSTEMSSPARK PLUG WIRESREMOVAL
1999 GMC Forward Control 5.7 R, Automatic
Spark Plug Wires: Removal
1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal
WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
Twist the spark plug boot one-half turn in order to release the boot. Pull on the spark plug boot only. Do not pull on the spark plug wire or the wire could be damaged.
- Remove the spark plug wires (2, 4, and 6) from the front bank (bank 1) spark plugs. Remove the spark plug wires from the retaining clips. Set the park brake. Shift the transaxle into Neutral. Remove the engine mount strut bolts. See Figure .
- Swing the engine mount struts aside. Install the Engine Tilter Strap (J-41131) to the engine. See Figure . Pull on the engine in order to rotate the engine forward. Tighten the engine tilter strap.
- Remove the spark plug wires (1, 3, and 5) from the rear bank (bank 2) spark plugs. Remove the spark plug wires from the retaining clips. Remove the spark plug wires from the ignition coils. Remove the spark plug wires from the engine. See Figure and Figure . If you are replacing the spark plug wires, transfer the boot heat shields, spark plug wire conduit and spark plug wire retaining clips.
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.