Engine will not start, no spark

1991 CHEVROLET SUBURBAN
11,000 MILES • 5.7L • V8 • 4WD • AUTOMATIC
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BUBBACOOPE
  • MEMBER
  • 3 POSTS
Replaced coil ran fine start stop restarted all day. Next morning wouldn't start no spark. replaced coil again started fine next morning same issue! No clue what's happening. any thoughts?
Sep 2, 2019 at 11:48 PM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Good morning,

Sounds like the module is bad and also failing the coil as well.

This time, change the module in the distributor and the module at the same time.

The module is demanding max coil output. Most could not take that for a long time.

Roy
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Sep 3, 2019 at 10:25 PM
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BUBBACOOPE
  • MEMBER
  • 3 POSTS
Did just that and stated right but now idle is a little rough in gear?
Sep 4, 2019 at 5:03 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
Okay, drive it for a little bit and see if it straightens out and keeps running. Stay close in case it shuts off.

https://www.2carpros.com/articles/engine-surges

Roy
Sep 4, 2019 at 5:12 AM
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BUBBACOOPE
  • MEMBER
  • 3 POSTS
Started right up this morning still idling rough.
Sep 4, 2019 at 9:43 AM
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ASEMASTER6371
  • ✓Experienced Mechanic
  • 52,796 POSTS
That is a different issue from the no spark issue.

Check the plugs, wires and look for any vacuum leaks.

Roy
Sep 4, 2019 at 9:54 AM
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