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.

SYS.OK|MANUAL.DB● LIVE

HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 683 (ENGINE MECHANICAL - 3.1L)REPAIR INSTRUCTIONSON-VEHICLE REPAIR INSTRUCTIONSINTAKE MANIFOLD REPLACEMENT - LOWERREMOVAL PROCEDURE

1999 GMC Forward Control 5.7 R, Automatic

Removal Procedure

1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal Procedure

WARNING: This page is about a different car, the 2003 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the negative battery cable. Refer to BATTERY NEGATIVE CABLE DISCONNECT/CONNECT PROCEDURE in Battery.
Remove the upper intake manifold. Refer to INTAKE MANIFOLD REPLACEMENT - UPPER .
Remove the left valve rocker arm cover. Refer to VALVE ROCKER ARM COVER REPLACEMENT - LEFT .
Remove the right valve rocker arm cover. Refer to VALVE ROCKER ARM COVER REPLACEMENT - RIGHT .
Disconnect the engine coolant temperature (ECT) sensor electrical connector.

Fig 1: Disconnecting Engine Coolant Temperature (ECT) Sensor Electrical Connector
Courtesy of GENERAL MOTORS CORP.
Disconnect and remove the fuel injector and the manifold absolute pressure (MAP) sensor wiring harnesses.

Fig 2: Removing Manifold Absolute Pressure (MAP) Sensor Wiring Harnesses
Courtesy of GENERAL MOTORS CORP.
Remove the fuel pipe clip bolt.

Fig 3: Removing Fuel Pipe Clip Bolt
Courtesy of GENERAL MOTORS CORP.
Remove the fuel pipe clip.

Fig 4: Removing Fuel Pipe Clip
Courtesy of GENERAL MOTORS CORP.
Remove the fuel feed pipe from the fuel injector rail.

Fig 5: Removing Fuel Feed Pipe From Fuel Injector Rail
Courtesy of GENERAL MOTORS CORP.
Remove the fuel return pipe from the fuel injector rail.

Fig 6: Removing Fuel Return Pipe From Fuel Injector Rail
Courtesy of GENERAL MOTORS CORP.
Remove the fuel injector rail. Refer to FUEL RAIL & INJECTORS in Engine Performance - Removal and Installation.
Remove the power steering pump from the front engine cover and reposition. Refer to POWER STEERING PUMP REPLACEMENT (3.1L) in Power Steering System.

Fig 7: Removing Fuel Injector Rail
Courtesy of GENERAL MOTORS CORP.
Remove the heater inlet pipe nut.
Remove the heater inlet pipe with heater hose from the lower intake manifold and reposition.
Remove the radiator inlet hose from the engine. Refer to RADIATOR HOSE REPLACEMENT - INLET (3.1 L) in Engine Cooling.

Fig 8: Removing Radiator Inlet Hose From Engine
Courtesy of GENERAL MOTORS CORP.
Remove the thermostat bypass hose from the thermostat bypass pipe and lower intake manifold pipe.

Fig 9: Removing Thermostat Bypass Hose From Thermostat Bypass Pipe And Lower Intake Manifold Pipe
Courtesy of GENERAL MOTORS CORP.
Remove the lower intake manifold bolts.
Remove the lower intake manifold.
Remove the valve rocker arms and pushrods. Refer to VALVE ROCKER ARM AND PUSH ROD REPLACEMENT .

Fig 10: Removing Lower Intake Manifold
Courtesy of GENERAL MOTORS CORP.
Remove the lower intake manifold gaskets and seals.
Clean the lower intake manifold gasket mating surfaces.
Remove and clean all the RTV sealant from the lower intake manifold and the engine block (1).

Fig 11: Removing Lower Intake Manifold Gaskets And Seals
Courtesy of GENERAL MOTORS CORP.
Remove the ECT sensor.

Fig 12: Removing ECT Sensor
Courtesy of GENERAL MOTORS CORP.
Remove the water outlet bolts.
Remove the water outlet.

Fig 13: Removing Water Outlet
Courtesy of GENERAL MOTORS CORP.
Remove the thermostat.

Fig 14: Removing Thermostat
Courtesy of GENERAL MOTORS CORP.