1989 GMC S15

1989 GMC S15
38,600 MILES • 4 CYL • 2WD • MANUAL
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MOONCHILD1956
  • MEMBER
  • 1 POST
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.
Jun 23, 2009 at 4:13 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 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.
Jul 1, 2009 at 11:44 AM
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