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Old 08-13-2017, 02:30 AM   #1
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Angry 2000 Miata Coil Pack - JDM vs USDM connector??

Hello All,

American, currently stationed at NAS Sigonella, Italy. Posted this on several forums...haven't gotten any replies.

I have a 2000 Miata, JDM right hand drive model, automatic tranny

One day the car started up really rough and engine shaking erratically. I changed all the spark plugs and wires and it returned to normal. The car sat for about 4-5 days and when I started it, it did the same thing again. Maybe missing cylinders...no CEL but the lamp might be out..

This led me to believe it was a bad coil pack. I ordered a coil pack from online for a 2000 Miata. I went to install it I noticed the electrical connectors on my car were not the same type/size for the new coil pack. The connectors on my car & bad coil pack are 3 pin, but not like the usual 3 pin with one dead space/plastic pin (I think from research, the whole old Tach hookup pin that's removed).

I believe this is a difference between EUR/JDM and US models...?

Would I be able to splice in pigtails to the new coil pack? I am having one heck of a time finding an exact replacement part! I've scoured the internet and can't even find an exact replacement

Thanks in advance for any help!
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Old 08-13-2017, 02:53 AM   #2
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I think it's more an auto vs manual difference but not sure
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Old 08-13-2017, 02:58 AM   #3
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Splice those connectors!
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Old 08-13-2017, 06:09 PM   #4
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Check the earth under throttle body.
I had irregular misfires etc for last few months. Found it was very loose other day when I pulled the engine for rebuild.
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Old 08-15-2017, 05:06 AM   #5
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I think it's more an auto vs manual difference but not sure
I'll look into that, thanks!
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Old 08-15-2017, 05:06 AM   #6
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Splice those connectors!
If I find that its in fact the coil pack, I will definitely give this a go...thanks!
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Old 08-15-2017, 05:10 AM   #7
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Originally Posted by adryargument View Post
Check the earth under throttle body.
I had irregular misfires etc for last few months. Found it was very loose other day when I pulled the engine for rebuild.
Thanks for the insight. I will take a look at this...this really has me curious as one day I was making my way around a somewhat sharp turn and the pavement was really bumpy...during the turn I lost some power and the speedo/tach then it came right back...I do believe a light illuminated but I can't remember what it was...I always figured it was a loose connection, somewhere.
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Old 08-15-2017, 11:08 AM   #8
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Losing power over bumpy pavement sounds like a loose battery ground to me. I had the same issue in my NB1. The stock connectors over time becomes useless and snap. Also check for corrosion on either terminal (+/-).
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Old 08-15-2017, 01:41 PM   #9
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The battery neg cable connects to the PPF underneath the trunk near the diff (on the 99 at least). If that connection gets flaky, it can do strange things. Mine rusted through and caused my alternator to intermittently not charge the battery. Check that too while you're looking for faulty grounds.
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Old 08-19-2017, 08:08 AM   #10
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Losing power over bumpy pavement sounds like a loose battery ground to me. I had the same issue in my NB1. The stock connectors over time becomes useless and snap. Also check for corrosion on either terminal (+/-).
Will do, thanks for the insight!
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Old 08-19-2017, 08:10 AM   #11
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The battery neg cable connects to the PPF underneath the trunk near the diff (on the 99 at least). If that connection gets flaky, it can do strange things. Mine rusted through and caused my alternator to intermittently not charge the battery. Check that too while you're looking for faulty grounds.
Thanks, I will check the areas. I do believe the battery/alt are fine - as I let the car sit for over 3 weeks and she still had crank power. I'm sure its pretty dead now as its been a long while with it still hooked up.
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