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1990 Chevy Lumina will not run

Tiny
JIMMY STEINMETZ
  • MEMBER
  • 1990 CHEVROLET LUMINA
Engine Mechanical problem
1990 Chevy Lumina 6 cyl Front Wheel Drive Automatic

will run for 30 seconds or so then will quit if you unplug altenator it will run fine.
Saturday, September 18th, 2010 AT 12:14 PM

1 Reply

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Hi
Most likely a bad diode causing AC wave pattern that PCM sees as an unidentifible signal causing it to shut down. Need ALT checked with scope to see if diode pattern is spiking.
Let me know
Thanks for donate
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Saturday, September 18th, 2010 AT 12:37 PM

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