1993 CHEVY ASTRO IGNITION

  • Tiny
  • 02ultrarider
  • 1993 Chevrolet Astro

Electrical problem
1993 Chevy Astro 6 cyl Two Wheel Drive Automatic 250K miles

if I jump the spark from my coil wire to the center post of the distributer cap the engine fires, put the wire on the cap and it quits. I replaced plugs, wires, coil, distributer cap, rotor, module, no difference.

Saturday, July 31st, 2010 AT 10:28 AM

5 Answers

  • Tiny
  • Jacobandnickolas
  • Expert
  • 68,410 posts

When you force the spark to jump, it creates a hotter spark. Answer this, when you plug the coil wire in, are you getting a weak spark to the plugs or any spark?

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Sunday, August 1st, 2010 AT 11:46 PM
  • Tiny
  • 02ultrarider
  • Member

No spark at all at the plugs when its forced, tonight I changed the pick up coil, yesterday a new ignition coil, I have 12+ volts and ground at the coil, its pulsing. Distributer module was changed along with plug wires, cap, rotor. This problem started slowly not all at once. I have check so many parts replaced to many lol. And am at a loss. Seems like nobody has seen this type of problem.

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Monday, August 2nd, 2010 AT 1:16 AM
  • Tiny
  • Jacobandnickolas
  • Expert
  • 68,410 posts

This is really odd. Like I mentioned, when the spark jumps, it becomes hotter. Now, what could be bad that needs a hotter spark? I realize you replaced many of the parts, but was it doing the same exact thing with the old distributor cap and rotor. And the other parts you replaced?

Also, you are right, this is not a common problem, but we'll figure it out. I will assume that when the plug wires were replaced, the coil wire was too.

Let me know.

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Monday, August 2nd, 2010 AT 11:04 PM
  • Tiny
  • 02ultrarider
  • Member

We thought at first that it was the fuel injection spider, because of the fuel smell. But we figured out that was from no spark, yes ALL the wires were replaced, delco cap, rotor, even tried a 3rd wire from just the coil. Talked to a mech at a local shop, and he has never heard of this problem, am thinking of having it towed there and let them hook all their testing equipment to it and see. This problem came on slowly, not just all at once, eventually it would not start anymore

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Monday, August 2nd, 2010 AT 11:47 PM
  • Tiny
  • Jacobandnickolas
  • Expert
  • 68,410 posts

In 30 years of working on cars, I never heard of this. Let me know what you find.
Joe

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Tuesday, August 3rd, 2010 AT 1:16 AM

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