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Diagnostic Aids

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Inspect the flywheel ring gear for damage or unusual wear.

Starter Motor Noise Diagnosis

Step Action Yes No
1 Did you perform the Engine Electrical Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Engine Electrical 
2 Start the engine.
Does the starter operate normally?		 Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems Go to Step 3 
3 Start the engine while listening to the starter motor turn.
Is there a loud "whoop", it may sound like a siren if the engine is revved while the starter is engaged after the engine starts, but while the starter is still held in the engaged position?		 Go to Step 6  Go to Step 4 
4 Do you hear a "rumble", a "growl", or, in some cases, a "knock" as the starter is coasting down to a stop after starting the engine? Go to Step 7  Go to Step 5 
5 This is often diagnosed as a starter drive gear hang-in or a weak solenoid.
When the engine is cranked, do you hear a high-pitched whine after the engine cranks and starts normally?		 Go to Step 6  Go to Step 7 
6 Inspect the flywheel ring gear for the following:
  • Chipped gear teeth
  • Missing gear teeth
  • Milled teeth

Is the flywheel bent, or does it have damaged teeth?		 Go to Step 8  Go to Step 9 
7
  1. Remove the starter motor. Refer to Starter Motor Replacement (4.2L Engine)  or Starter Motor Replacement (5.3L Engine) .
  2. Inspect the starter motor bushings and clutch gear.
Does the clutch gear have chipped or milled teeth or worn bushings?		 Go to Step 9  Go to Step 8 
8 Replace the flywheel. Refer to Engine Flywheel Replacement in Engine Mechanical - 4.2L.
Did you complete the replacement?		 Go to Step 10  -
9 Replace the starter motor. Refer to Starter Motor Replacement (4.2L Engine)  or Starter Motor Replacement (5.3L Engine) .
Did you complete the replacement?		 Go to Step 10  -
10 Operate the system in order to verify the repair.
Did you correct the condition?		 System OK Go to Step 3 
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