1989 GMC S15

Tiny
MOONCHILD1956
  • MEMBER
  • 1989 GMC S15
  • 4 CYL
  • 2WD
  • MANUAL
  • 38,600 MILES
When I engage my key it sparks once, it doesn't spark while the engine turns over and it sparks when I let the key out. Any ideas.
Tuesday, June 23rd, 2009 AT 11:13 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Make sure the plug to the ecm is tight. THe computer sends a stronger spark when the engine is just started to help start a cold engine and then lowers the voltage when it starts and the key is in the run position.
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Wednesday, July 1st, 2009 AT 6:44 PM

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