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Old 08-02-2011, 02:32 PM   #1
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Default Coil grounds to engine and loses spark

So Im driving around our shitty ******* roads last night and as I bounce my 700lbs springs and bilsteins off the bumpstops my car suddenly loses 2 cylinders.

Pull over and confirm spark on only 1 coilpack.

With the car running fine and me holding the coils, when I go to mount them again it starts sparking against the motor and then car starts to die.

WTF is going on here? Nothing looks to be grounding from the coil to the coil bracket.

Maybe I cracked a coil and its arcing to the bracket??

So currently I have the coils wrapped in leather gloves to prevent them from grounding, I'm going to swap them for a spare set I have but Im curious why this is happening.
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Old 08-02-2011, 03:09 PM   #2
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what coils? stock?
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Old 08-02-2011, 03:33 PM   #3
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Yes sir, 1.6 coils with FM's 1.8 relocate bracket mounted to my FE3
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Old 08-03-2011, 04:23 AM   #4
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Interesting. Your coil probably does have a crack in it. Or the wire going to the igniter is touching the coil bracket or something?

Never seen this happen on a Miata.
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Old 08-03-2011, 05:37 AM   #5
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Quote:
Originally Posted by MartinezA92 View Post
Interesting. Your coil probably does have a crack in it. Or the wire going to the igniter is touching the coil bracket or something?

Never seen this happen on a Miata.
No wires touching, checked for that immediately after it started doing this.

Mother-******* roads up here are **** and I'm running 700lbs springs and slammed so that probably doesn't help.

I'll water test that bitch tomorrow to see if it is cracked, good thing I have spares coils.
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Old 08-03-2011, 12:05 PM   #6
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I found this to be the issue with my coils during my swap. I would lose a pair of cylinders as one was grounding out. There was a wire off the bottom of one of the coils that was close enough to arc over to the block. Just needed to reroute it and all is well now.
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Old 08-03-2011, 02:21 PM   #7
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Originally Posted by matthewdesigns View Post
I found this to be the issue with my coils during my swap. I would lose a pair of cylinders as one was grounding out. There was a wire off the bottom of one of the coils that was close enough to arc over to the block. Just needed to reroute it and all is well now.
I had that happen before too, but now it arcs from the coil mounting bracket to ground. No matter if the coil is cracked I'll just replace it.
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Old 08-03-2011, 02:38 PM   #8
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You mean I can't drill holes through the coil to make new mounting options?!!?

Seriously…before you fix it, make a video.

At night.
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Old 08-03-2011, 02:49 PM   #9
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You mean I can't drill holes through the coil to make new mounting options?!!?

Seriously…before you fix it, make a video.

At night.
Why, might I inquire? Make a video at all that is.
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Old 08-03-2011, 03:45 PM   #10
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Why, might I inquire? Make a video at all that is.
Cuz it would take two minutes and look cool? Depends on where you are getting the voltage leakage of course.

Sort of like this one:

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