Pinpoint Test C: Unusual Starter Noise
WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
- C1 CHECK THE STARTER MOUNTING
- Inspect the starter motor mounting bolts for looseness.
- Is the starter motor mounted correctly?
- Yes: GO to C2.
- No: INSTALL the starter motor correctly. REFER to Removal and Installation (2.5L), Removal and Installation (3.0L) or Removal and Installation (3.5L). TEST the system for normal operation.
- C2 CHECK FOR ENGINE NOISE
- Turn the ignition switch to the OFF position.
- Connect a fused jumper wire from the B-terminal to the S-terminal of the starter motor. Engage the starter motor and verify that the noise is due to the starter operation.
- Is the noise due to the starter motor engagement?
- Yes: GO to C3.
- No: REFER to DIAGNOSIS AND TESTING to continue the diagnosis.
- C3 CHECK FOR UNUSUAL WEAR
- Remove the starter motor. Refer to Removal and Installation (2.5L), Removal and Installation (3.0L) or Removal and Installation (3.5L).
- Inspect the ring gear for damaged or worn teeth.
- Is the noise due to flexplate/flywheel ring gear tooth damage?
- Yes: INSTALL a new flexplate/flywheel ring gear. EXAMINE the starter pinion teeth. If damaged, INSTALL a new starter motor. REFER to Removal and Installation (2.5L), Removal and Installation (3.0L) or Removal and Installation (3.5L). TEST the system for normal operation.
- No: INSTALL a new starter motor. REFER to Removal and Installation (2.5L), Removal and Installation (3.0L) or Removal and Installation (3.5L). TEST the system for normal operation.