Coil pack overheating

2005 PONTIAC GRAND PRIX
178,000 MILES • 2.8L • 6 CYL • 2WD • AUTOMATIC
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KIM MOOK
  • MEMBER
  • 8 POSTS
Car wouldn't start, while looking under hood I put my hand on coil pack and it was extremely hot. Took it off and it had melted. Bought a new one getting crank but no spark and coil pack is still getting very hot when car not even warm. I have to unhook the positive off battery.
Dec 8, 2019 at 2:30 AM
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AL514
  • ✓Experienced Mechanic
  • 5,610 POSTS
Hello, did you replace the ignition module that sits under the coils?
Dec 8, 2019 at 3:32 AM
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KIM MOOK
  • MEMBER
  • 8 POSTS
No I haven't. should i?
Dec 8, 2019 at 4:07 AM
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AL514
  • ✓Experienced Mechanic
  • 5,610 POSTS
The ignition module controls all the coils, if the new coils are overheating there is probably a fault with the module. Most of the time we've replaced the module and coils at the same time. There's a lot of current flow going through all of it. If the module has high resistance for some reason this creates a lot of heat, and will start melting things as you've seen. Follow the instructions when installing the new module also.
Dec 8, 2019 at 4:38 AM
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KIM MOOK
  • MEMBER
  • 8 POSTS
Okay I will surely give this a try. thank you so much for your time.

Sincerely,
Much appreciated
Dec 8, 2019 at 5:21 AM
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AL514
  • ✓Experienced Mechanic
  • 5,610 POSTS
Check the plug for the module , make sure there's no green corrosion in there and the wires look okay.
Dec 8, 2019 at 5:38 AM
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KIM MOOK
  • MEMBER
  • 8 POSTS
Will do. Thank you so much again.
Dec 8, 2019 at 6:30 AM
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AL514
  • ✓Experienced Mechanic
  • 5,610 POSTS
You're welcome, any other issues and we're here. Cheers!
Dec 9, 2019 at 9:44 AM
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KIM MOOK
  • MEMBER
  • 8 POSTS
Bad ignition module you guys are awesome. such a big help. Thank you again.
Dec 10, 2019 at 12:43 AM
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AL514
  • ✓Experienced Mechanic
  • 5,610 POSTS
You're welcome, have a good night.
Dec 10, 2019 at 6:02 AM
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