Engine Cranks Slowly

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Savana Special, 2003 GMC Savana Camper Special, 2003 GMC Savana, 2003 Chevrolet RV Cutaway, and 2003 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

Perform the following checks:

Battery - Battery Inspection/Test. For 2003, see BATTERY TESTING & INSPECTION under ON-VEHICLE TESTING in GENERATORS & REGULATORS article in CHARGING SYSTEM in ELECTRICAL.
Wiring - Inspect the wiring for damage. Inspect all connections to the starter motor, solenoid, battery and all ground connections. See INTERMITTENTS under SYMPTOMS - ENGINE ELECTRICAL.
Engine - Make sure the engine is not seized. See BASIC TROUBLE SHOOTING article in GENERAL INFORMATION.

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 REPLACEMENT (4.3L) or STARTER MOTOR REPLACEMENT (4.8L, 5.3L & 6.0L) under REPAIR INSTRUCTIONS.