Engine Cranks Slowly

WARNING: This page is about a different car, the 2003 GMC Safari and 2003 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.

Perform the following checks:

Battery - Battery Inspection/Test. Refer to BATTERY INSPECTION/TEST .
Wiring - Inspect the wiring for damage. Inspect all connections to the starter motor, solenoid, battery, and all ground connections. Refer to CIRCUIT TESTING , WIRING REPAIRS , TESTING FOR INTERMITTENT AND POOR CONNECTIONS and to CONNECTOR REPAIRS in Wiring Systems.
Engine - Make sure the engine is not seized. Refer to SYMPTOMS - ENGINE MECHANICAL .
If the battery, the wiring and the engine are functioning properly and the engine continues to crank slowly, replace the starter motor.