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My 1999 Chevy Blazer with the 4

Tiny
CHRISCAMPBELL96
  • MEMBER
  • 1999 CHEVROLET BLAZER
  • 153,000 MILES
My 1999 chevy blazer with the 4.3l vortec v6 has cylinder 4 misfire. I have replaced the plugs, wires, rotor, and cap multiple times. The coil wire is arcing at the coil and distributor cap; which is what I believe is causing the misfire. What is causing the coil to arc? Is the arcing causing the misfire?
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Monday, February 4th, 2013 AT 8:04 PM

16 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,230 POSTS
Most likely that is causing the problem. Have you replaced the coil wire?
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Monday, February 4th, 2013 AT 8:57 PM
Tiny
CHRISCAMPBELL96
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  • 10 POSTS
Yes, I've replaced the coil wire every time I've replaced the wires.
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Monday, February 4th, 2013 AT 9:04 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Is the coil cracked? Explain exactly where the arc is located.
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Monday, February 4th, 2013 AT 9:05 PM
Tiny
CHRISCAMPBELL96
  • MEMBER
  • 10 POSTS
I have not found a crack in it the only thing I have found is that it moves a little bit on the mounting bracket. It's arching right where the wire connects to the coil and then where the other end of the wire connects to the distributor cap.
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Monday, February 4th, 2013 AT 9:15 PM
Tiny
JACOBANDNICKOLAS
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Can you tighten the mount? Also, have you checked for cracks?
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Monday, February 4th, 2013 AT 9:19 PM
Tiny
CHRISCAMPBELL96
  • MEMBER
  • 10 POSTS
The coil still has rivets in it from the factory holding it to the bracket. I have once but I'll go look it over again.
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Monday, February 4th, 2013 AT 9:21 PM
Tiny
CHRISCAMPBELL96
  • MEMBER
  • 10 POSTS
Where is a crack in the coil most likely to be at?
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Monday, February 4th, 2013 AT 9:23 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Near where the coil wire goes on. Is it arcing to the mount?
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Monday, February 4th, 2013 AT 9:25 PM
Tiny
CHRISCAMPBELL96
  • MEMBER
  • 10 POSTS
I didn't find a crack but I guess there is always a possibility of a hairline crack. I don't believe it's arcing to the bracket but I can't check right now bc it's not dark outside
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Monday, February 4th, 2013 AT 9:32 PM
Tiny
JACOBANDNICKOLAS
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Let me know
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Monday, February 4th, 2013 AT 9:38 PM
Tiny
CHRISCAMPBELL96
  • MEMBER
  • 10 POSTS
Ok after taking a closer look it looks like it is arcing at the side of the coil and the possibly traveling back to the distibutor cap. I ordered a new one and hopefully that will do the trick. If it doesn't work whatelse could be causing it to arc?
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Tuesday, February 5th, 2013 AT 12:50 AM
Tiny
JACOBANDNICKOLAS
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That is a very good question. We'll try one thing at a time. Are you sure the plug wires you got are made for your vehicle? Are they quality wires?
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Tuesday, February 5th, 2013 AT 1:53 AM
Tiny
CHRISCAMPBELL96
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The plug wires are acdelco and exact fit for my blazer.
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Tuesday, February 5th, 2013 AT 1:59 AM
Tiny
JACOBANDNICKOLAS
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Okay, sometimes cheap wires can cause problems. It was just an idea.
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Tuesday, February 5th, 2013 AT 2:00 AM
Tiny
CHRISCAMPBELL96
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Yeah I was told the vortec doesn't like the cheap wire or anything in the ignition wise. That's why I bought all acdelco parts
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Tuesday, February 5th, 2013 AT 2:05 AM
Tiny
CHRISCAMPBELL96
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  • 10 POSTS
Well I got the coil and icm replaced, but the misfire is still there
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Thursday, February 7th, 2013 AT 9:36 PM

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