won't change to 4th just revs up

1994 MAZDA 929
50,000 MILES
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JUNE
  • MEMBER
  • 1 POST
Gears change viciously from 1st to 2nd and to 3rd. Then won't change to 4th just revs up to 4.5 then changes some times to 4th. Few years ago the alternator blew up when in for a service. We replaced it with a generic alternator. Could the computer be playing with the gears because of the generic alternator.
Jan 1, 2012 at 3:40 AM
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KHLOW2008
  • ✓Experienced Mechanic
  • 41,812 POSTS
If the charging rate is inconistent or low, it can cause the problem.

Have you tried to check for troubel codes?
Is the MIL indicating?
Jan 1, 2012 at 4:10 AM
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