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Can one test coil packs?

Tiny
METOU
  • MEMBER
  • 2005 GMC YUKON
  • V8
  • 200,000 MILES
Need to replace a coil pack but don't know which one to replace. Is there a way to check the pack to see if it is bad or good?
Friday, March 29th, 2024 AT 7:05 AM

2 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
The best way to test a coil is its output which you can do while it is in the car. Use a test light and follow this video:

https://youtu.be/baq_aEWNQ0Y?si=EdOtoGHYP9CwjWLk

You can check the coil OHM's reading with a voltmeter but that can change while the coil is being used. Check the coil's resistance by placing the multimeter's leads on the coil's primary and secondary terminals.

This guide can help as well:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Here is how to replace the ignition coils correctly in case you need them. Check out the images (below). Please let us know what happens.
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Friday, March 29th, 2024 AT 10:53 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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Anything?
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Saturday, May 11th, 2024 AT 1:01 PM

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