Download CONDITION POSSIBLE CAUSE CORRECTION Very High Frequency Excessive distance between Shim starter motor toward Flywheel/Drive Whine Before Engine pinion gear and Flywheel/Drive Plate. Starts; Engine Starts OK. Plate gear. Very High Frequency Insufficient distance between Shim starter motor away from Whine After Engine Starts starter motor pinion gear and Flywheel/Drive Plate. Inspect With Ignition Key Flywheel/ Drive Plate runout Flywheel/Drive Plate for damage; bent, Released. Engine Starts can cause noise to be unusual wear, and excessive runout. OK. intermittent. Replace Flywheel/Drive Plate as necessary. A Loud “Whoop” After Probable cause is defective Replace starter motor. Engine Starts While Starter overrunning clutch. Motor is Engaged “Rumble”, “Growl”, or Probable cause is bent or Replace starter motor. “Knock” as Starter Motor unbalanced starter motor Coasts to Stop After armature. Engine Starts.