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2000 Hyundai Elantra overcharging ALT?

Tiny
DJRABBIT
  • MEMBER
  • 2000 HYUNDAI ELANTRA
  • 2.0L
  • 4 CYL
  • 2WD
  • MANUAL
  • 100,000 MILES
My 2000 Hyundai Elantra keeps cooking the coil pack. Why?
Tuesday, July 15th, 2014 AT 4:52 AM

7 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Why don't you explain what "cooking the coil pack" means and how you are concluding this.
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Tuesday, July 15th, 2014 AT 5:29 AM
Tiny
DJRABBIT
  • MEMBER
  • 4 POSTS
It means it doesn't work. We have replaced it twice and we have to replace it again. The car turns over but we have no fire to the coil pack.
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Tuesday, July 15th, 2014 AT 5:41 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
I seriously doubt the coils are the actual problem. It may fire up after replacing them simply because of a small increase in KV but I suspect you have too much resistance in other parts of the secondary circuit after the coil. Also check that you are getting full battery voltage coming into the coil.
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Tuesday, July 15th, 2014 AT 10:07 AM
Tiny
DJRABBIT
  • MEMBER
  • 4 POSTS
We checked the voltage output and it was 13.7. The coils were checked and they wouldn't discharge. What else should we be testing?
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Wednesday, July 16th, 2014 AT 1:50 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Coils just don't fail that way. There has to be a different issue. You are going to have to check power supply and ground pulse when this happens.
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Wednesday, July 16th, 2014 AT 2:23 PM
Tiny
DJRABBIT
  • MEMBER
  • 4 POSTS
Could it be the ECM? How do you check ground pulse? When it doesn't work, I get power to all 4 connections on the coil pack.
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Wednesday, July 16th, 2014 AT 2:44 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
No, you don't. You're testing it while plugged in and reading through the coil. You would need a noid light to test for pulse when it fails.Don't use anything else or you could burn out the module.

https://www.2carpros.com/images/external/1Noidlightpair__.jpg
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Wednesday, July 16th, 2014 AT 3:02 PM

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