GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2001 🢒 Firebird 🢒 Engine 🢒 Engine Electrical 🢒 Engine Will Not Crank - Crankshaft Will Not Rotate

Cause

Correction

Seized accessory drive system component
  1. Remove accessory drive belt(s).
  2. Rotate crankshaft by hand at the balancer or flywheel location.

Hydraulically locked cylinder

    • Coolant/antifreeze in cylinder
    • Oil in cylinder
    • Fuel in cylinder
  1. Remove spark plugs and check for fluid.
  2. Inspect for broken head gasket(s).
  3. Inspect for cracked engine block or cylinder head.
  4. Inspect for a sticking fuel injector and/or leaking fuel regulator.

Seized automatic transmission torque converter
  1. Remove the torque converter bolts.
  2. Rotate crankshaft by hand at the balancer or flywheel location.

Seized Manual Transmission
  1. Disengage the clutch.
  2. Rotate Crankshaft by hand at the balancer or flywheel location.

Refer to Unit Repair Manual - Manual Transmission.

Broken timing chain and/or timing chain gears
    • Inspect timing chain and gears.
    • Repair as required.

Seized balance shaft bearing
  1. Inspect balance shaft bearings.
  2. Repair as required.

Material in cylinder

    • Broken valve
    • Piston material
    • Foreign material
    • Inspect cylinder for damaged components and/or foreign materials.
    • Repair or replace as required.

Seized crankshaft or connecting rod bearings
    • Inspect crankshaft and connecting rod bearings.
    • Repair as required.

Bent or broken connecting rod
    • Inspect connecting rods.
    • Repair as required.

Broken crankshaft
    • Inspect crankshaft.
    • Repair as required.