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 342 (STARTING SYSTEM)DIAGNOSTIC INFORMATIONENGINE CRANKS SLOWLY
1999 GMC Forward Control 5.7 R, Automatic
Engine Cranks Slowly
1999 GMC Forward Control 5.7 R, AutomaticSECTION Engine Cranks Slowly
WARNING: This page is about a different car, the 2003 GMC Sonoma, 2003 GMC Jimmy, 2003 Chevrolet S10 Pickup, and 2003 Chevrolet Blazer. However, it is still accessible from the selected car via links, so may be relevant.
Inspect the following items:
- Perform the Battery Inspection/Test. See BATTERY TESTING & INSPECTION in GENERATORS & REGULATORS .
- Inspect the wiring for damage. Inspect all connections to the starter motor, the solenoid, the battery, and all ground connections.
- Verify that the engine is not seized.
- If the battery, the wiring, and the engine are functioning properly, and the engine continues to crank slowly, replace the starter motor. See STARTER MOTOR .
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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.