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 455 (ENGINE MECHANICAL)REPAIR INSTRUCTIONSOFF-VEHICLE REPAIR INSTRUCTIONSINTAKE MANIFOLD REMOVAL - UPPER

1999 GMC Forward Control 5.7 R, Automatic

Intake Manifold Removal - Upper

1999 GMC Forward Control 5.7 R, AutomaticSECTION Intake Manifold Removal - Upper

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.

Remove the MAP sensor electrical connector.
Remove the MAP sensor bolts.
Remove the MAP sensor from bracket.
Remove the MAP sensor bracket and bracket bolt.

Fig 1: Removing MAP Sensor From Bracket
Courtesy of GENERAL MOTORS CORP.
Remove the EGR valve pipe and bolt from the EGR valve.
Remove the EGR valve bolts.
Remove the EGR valve and gasket.

Fig 2: Removing EGR Valve And Gasket
Courtesy of GENERAL MOTORS CORP.
Remove the vacuum harness assembly.

Fig 3: Removing Vacuum Harness Assembly
Courtesy of GENERAL MOTORS CORP.
Remove the accelerator cable bracket and bracket bolts.

Fig 4: Removing Accelerator Cable Bracket
Courtesy of GENERAL MOTORS CORP.
Remove the purge valve bracket bolt, hose and valve assembly.
Remove the throttle body bolts.
Remove the throttle body and gasket.
Remove the upper intake manifold bolts.
Remove the upper intake manifold and gaskets.

Fig 5: Removing Upper Intake Manifold And Gaskets
Courtesy 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.