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 249 (ENGINE CONTROLS - REMOVAL & INSTALLATION)AIR INDUCTION SYSTEMSSUPERCHARGERREMOVAL

1999 GMC Forward Control 5.7 R, Automatic

Air Induction Systems: Supercharger: Removal

1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal

WARNING: This page is about a different car, the 2003 Pontiac Bonneville, 2003 Buick Park Avenue, and 2003 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.

Remove the spark plug wires.
Remove the vacuum line from the fuel injector rail. See Fig 1.

Fig 1: Removing Fuel Injector Vacuum Line & Rail
Courtesy of GENERAL MOTORS CORP.
Remove the fuel rail nuts and stud.
Remove the fuel injector rail.
Remove the booster bypass nut and hose. See Fig 2.

Fig 2: Removing Booster Bypass
Courtesy of GENERAL MOTORS CORP.
Remove the booster bypass.
Remove the regulator valve and the harness bolt.
Remove the boost solenoid bolts and hose.
Remove the bolts from the vacuum block.
Remove the engine wiring harness heat shield bolt and nut. See Fig 3.

Fig 3: Removing Wiring Harness Heat Shield
Courtesy of GENERAL MOTORS CORP.
Remove the engine harness wiring heat shield.
Remove the MAP sensor bracket bolts and hose. See Fig 4.

Fig 4: Removing MAP Sensor Bracket
Courtesy of GENERAL MOTORS CORP.
Remove the MAP sensor bracket.

NOTE: Note the location of the spacers and the bolt sizes to aid in installation.

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.