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Old 10-03-2018, 01:50 PM   #21
imaddicted2u
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2008 AURA XE
Default Re: 2007 Aura XR won't start (sporadic problem, not a dead battery))

A failing starter may crank intermittently it will not cause the tach to be inoperable.

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2008 Saturn Aura XE 3.5L 4 spd
2000 Saturn SL1 1.9L SOHC (Retired)

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Old 10-03-2018, 02:29 PM   #22
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2003 L-Series 3.0L Sedan
Default Re: 2007 Aura XR won't start (sporadic problem, not a dead battery))

Quote:
Originally Posted by floridasl22002 View Post
...... A clued up mechanic determined that the starter motor had developed 'flat spots'. When the thing stopped on the flat spots, there would be no contact to spin the starter. I guess minute movement then nudged it off the flat spot and it would start normally. Swapped out the Starter Motor and no more issues.
It's more likely for starter motor brushes to wear down causing 'flat spot' syndrome. Whether two or four brushes, they wear down. Spring pressure maintains electrical contact at all times until brushes wear down then less contact pressure results in a flat spot syndrome. Well worn brushes simply won't make good electrical contact against the commutator, the rotor with segmented copper contacts connected to windings around the rotor. Old school mechanics and some new school ones inheriting troubleshooting tips usually try banging the starter body with a rubber mallet - this can help worn brushes make contact for at least one more starter run. This presumes all other troubleshooting was completed to point to a worn out starter. It's rare for anyone disassembling starters to learn how they work and what causes them to fail. At one time or another, I disassembled and rebuilt one starter and alternator. The rubber mallet trick didn't work on one starter but it was replaced as the answer.

Last edited by fdryer; 10-03-2018 at 02:34 PM..

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