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 569 (ENGINE MECHANICAL - 3.4L)REPAIR INSTRUCTIONSON-VEHICLE REPAIR INSTRUCTIONSENGINE MOUNT INSPECTION
1999 GMC Forward Control 5.7 R, Automatic
Engine Mount Inspection
1999 GMC Forward Control 5.7 R, AutomaticSECTION Engine Mount Inspection
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
In order to avoid oil pan damage and possible engine failure, insert a block of wood that spans the width of the oil pan bottom between the oil pan and the jack support.
- Raise the engine in order to remove the weight from the engine mount and create slight tension in the rubber.
- Observe the engine mount while raising the engine. Replace the engine mount if the engine mount exhibits any of the following conditions:
- The hard rubber surface is covered with heat check cracks.
- The rubber is separated from the metal plate of the engine mount.
- The rubber is split through the center of the engine mount.
- If there is movement between the metal plate of the engine mount and its attaching points, lower the engine on the engine mount. Tighten the bolts or nuts attaching the engine mount to the frame or engine mount bracket. Refer to Engine Mount Bracket Replacement .
IMPORTANT:
Before replacing any engine mount due to suspected fluid loss, verify that the source of the fluid is the engine mount, not the engine or accessories.
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.