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)
1999 GMC Forward Control 5.7 R, Automatic
Section 455 (Engine Mechanical)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Section 455 (Engine Mechanical)
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.
- Torque Specifications
- Specifications
- Component Locator
- Diagnostic Information & Procedures
- Diagnostic Starting Point - Engine Mechanical
- Symptoms - Engine Mechanical
- Base Engine Misfire without Internal Engine Noises
- Base Engine Misfire with Abnormal Internal Lower Engine Noises
- Base Engine Misfire with Abnormal Valve Train Noise
- Base Engine Misfire with Coolant Consumption
- Base Engine Misfire with Excessive Oil Consumption
- Engine Noise on Start-Up, but Only Lasting a Few Seconds
- Upper Engine Noise, Regardless of Engine Speed
- Lower Engine Noise, Regardless of Engine Speed
- Engine Noise Under Load
- Engine Will Not Crank - Crankshaft Will Not Rotate
- Coolant in Combustion Chamber
- Coolant in Engine Oil
- Engine Compression Test
- Cylinder Leakage Test
- Oil Consumption Diagnosis
- Oil Pressure Diagnosis and Testing
- Oil Leak Diagnosis
- Crankcase Ventilation System Inspection/Diagnosis
- Drive Belt Chirping Diagnosis
- Drive Belt Squeal Diagnosis
- Drive Belt Whine Diagnosis
- Drive Belt Rumbling Diagnosis
- Drive Belt Vibration Diagnosis
- Drive Belt Falls Off Diagnosis
- Drive Belt Excessive Wear Diagnosis
- Drive Belt Tensioner Diagnosis
- Repair Instructions
- On-Vehicle Repair Instructions
- Drive Belt Replacement
- Drive Belt Tensioner Replacement
- Drive Belt Idler Pulley Replacement - Upper
- Engine Mount Inspection
- Engine Support Fixture
- Engine Mount Replacement
- Engine Mount Bracket Replacement (FWD)
- Engine Mount Bracket Replacement (AWD)
- Engine Mount Strut Replacement - Left
- Engine Mount Strut Replacement - Right
- Engine Mount Strut Bracket Replacement - Left
- Engine Mount Strut Bracket Replacement - Right
- Engine Mount Strut Bracket Replacement- Upper Radiator Support
- Oil Cooler Replacement
- Oil Cooler Inlet Line Replacement
- Oil Cooler Outlet Line Replacement
- Oil Filter Adapter & Bypass Valve Assembly Replacement
- Oil Level Indicator and Tube Replacement
- Intake Manifold Replacement - Upper
- Intake Manifold Replacement - Lower
- Positive Crankcase Ventilation (PCV) Valve Replacement
- Valve Rocker Arm Cover Replacement - Left
- Valve Rocker Arm Cover Replacement - Right
- Valve Rocker Arm and Push Rod Replacement
- Valve Stem Oil Seal and Valve Spring Replacement
- Valve Lifter Replacement
- Crankshaft Balancer Replacement
- Oil Pan Replacement
- Engine Oil Pressure Sensor and/or Switch Replacement
- Engine Oil Level Sensor and/or Switch Replacement
- Crankshaft Oil Deflector Replacement
- Oil Pump Replacement
- Oil Pump Drive Replacement
- Crankshaft Front Oil Seal Replacement
- Engine Front Cover Replacement
- Timing Chain and Sprockets Replacement
- Cylinder Head Replacement - Left
- Cylinder Head Replacement - Right
- Engine Flywheel Replacement
- Crankshaft Rear Oil Seal Replacement
- Camshaft Rear Bearing Hole Plug Replacement
- Engine Replacement
- Engine Oil and Oil Filter Replacement
- Off-Vehicle Repair Instructions
- Draining Fluids and Oil Filter Removal
- Crankshaft Balancer Removal
- Engine Flywheel Removal
- Drive Belt Tensioner Removal
- Engine Mount Strut and Air Conditioning Compressor Bracket Removal
- Engine Mount Strut and Engine Lift Bracket Removal
- Engine Lift Bracket and Generator Bracket Removal
- Oil Level Indicator and Tube Removal
- Oil Cooler Removal
- Oil Filter Adapter Removal
- Air Injection Check Valve Removal
- Exhaust Manifold Removal - Left
- Exhaust Manifold Removal - Right
- Water Outlet and Thermostat Removal
- Valve Rocker Arm Cover Removal - Left
- Valve Rocker Arm Cover Removal - Right
- Intake Manifold Removal - Upper
- Intake Manifold Removal - Lower
- Valve Rocker Arm and Push Rod Removal
- Valve Lifter Removal
- Water Pump Removal
- Cylinder Head Removal - Left
- Cylinder Head Removal - Right
- Oil Pan Removal
- Oil Pump Removal
- Oil Pump Drive Removal
- Crankshaft Front Oil Seal Removal
- Engine Front Cover Removal
- Timing Chain and Sprockets Removal
- Camshaft Removal
- Piston, Connecting Rod & Bearing Removal
- Crankshaft Rear Oil Seal Removal
- Crankshaft and Bearings Removal
- Camshaft Bearing Removal
- Engine Block Disassemble
- Engine Block Cleaning and Inspection
- Cylinder Boring and Honing
- Engine Block Assemble
- Crankshaft and Bearings Cleaning and
- Crankshaft Balancer Cleaning and Inspection
- Engine Flywheel Cleaning and Inspection
- Piston and Connecting Rod Disassemble
- Piston, Connecting Rod & Bearings Cleaning & Inspection
- Piston and Connecting Rod Assemble
- Camshaft and Bearings Cleaning and Inspection
- Timing Chain and Sprockets Cleaning and Inspection
- Valve Lifters Cleaning and Inspection
- Valve Rocker Arm and Push Rods Cleaning and Inspection
- Cylinder Head Disassemble
- Cylinder Head Cleaning and Inspection
- Valve Guide Reaming/Valve and Seat Grinding
- Cylinder Head Assemble
- Oil Pump Disassemble
- Oil Pump Cleaning and Inspection
- Oil Pump Assemble
- Engine Front Cover Cleaning and Inspection
- Valve Rocker Arm Cover Cleaning and Inspection
- Oil Pan Cleaning and Inspection
- Intake Manifold Cleaning and Inspection - Lower
- Intake Manifold Cleaning and Inspection - Upper
- Exhaust Manifold Cleaning and Inspection
- Water Pump Cleaning and Inspection
- Thread Repair
- Service Prior to Assembly
- Engine Prelubing
- Camshaft Bearing Installation
- Crankshaft and Bearings Installation
- Crankshaft Rear Oil Seal Installation
- Piston, Connecting Rod & Bearing Installation
- Camshaft Installation
- Timing Chain and Sprockets Installation
- Engine Front Cover Installation
- Crankshaft Front Oil Seal Installation
- Oil Pump Drive Installation
- Oil Pump Installation
- Oil Pan Installation
- Cylinder Head Installation - Left
- Cylinder Head Installation - Right
- Water Pump Installation
- Valve Lifter Installation
- Valve Rocker Arm and Push Rod Installation
- Intake Manifold Installation - Lower
- Valve Rocker Arm Cover Installation - Left
- Water Outlet and Thermostat Installation
- Exhaust Manifold Installation - Left
- Exhaust Manifold Installation - Right
- Air Injection Check Valve Installation
- Oil Filter Adapter Installation
- Oil Cooler Installation
- Oil Level Indicator and Tube Installation
- Engine Lift Bracket and Generator Bracket Installation
- Engine Mount Strut and Engine Lift Bracket Installation
- Engine Mount Strut and Air Conditioning Compressor Bracket Installation
- Drive Belt Tensioner Installation
- Engine Flywheel Installation
- Crankshaft Balancer Installation
- Rotating the Engine for Service Access
- On-Vehicle Repair Instructions
- Description & Operation
- Special Tools & Equipment
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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.