Pinpoint Test B: Unusual Starter Noise

WARNING: This page is about a different car, the 2013 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.

B1 CHECK THE STARTER MOTOR MOUNTING
- Inspect the starter motor mounting bolts for looseness.
- Is the starter motor mounted correctly?
- Yes : GO to B2.
- No : INSTALL the starter motor correctly. REFER to STARTER MOTOR - 3.7L or STARTER MOTOR - 5.0L (4V) or STARTER MOTOR - 5.8L (4V) . TEST the system for normal operation.
B2 CHECK FOR ENGINE NOISE
- Ignition OFF.
- Connect a remote starter switch between the starter solenoid B- and S-terminals.
  
  Fig 1: Checking Engine Noise
  Courtesy of FORD MOTOR CO.
- Engage the starter motor and verify the noise is due to the starter operation.
- Is the noise due to the starter motor engagement?
- Yes : GO to B3.
- No : REFER to ENGINE SYSTEM - GENERAL INFORMATION to continue the diagnosis.
B3 CHECK FOR UNUSUAL WEAR
- Remove the starter motor. REFER to STARTER MOTOR - 3.7L or STARTER MOTOR - 5.0L (4V) or STARTER MOTOR - 5.8L (4V) .
- Inspect the ring gear for damaged or worn teeth.
- Is the noise due to ring gear tooth damage?
- Yes : INSTALL a new flexplate/flywheel ring gear. EXAMINE the starter pinion teeth. If damaged, INSTALL a new starter motor. TEST the system for normal operation.
- No : INSTALL a new starter motor. REFER to STARTER MOTOR - 3.7L or STARTER MOTOR - 5.0L (4V) or STARTER MOTOR - 5.8L (4V) . TEST the system for normal operation.