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Old 04-10-2011, 02:10 PM   #1
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Default MS "pop" Fix and blew a coil

I just did the MS hack to wire in the transistors and invert the spark so my car would stop popping on startup but now I'm running on 1 coil. It blew 1 and 4 almost immediately.

I installed the unit, unplugged the coils, burned the unit to invert the spark output, plugged the coils back in, and it started on 2 cylinders.

I've double checked my wiring and everything seems ok. Also, the fact that the car does run on those two cylinders would seem to indicate that it's setup correctly.

Anything else I should check before I throw in a new coil and risk blowing it?
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Old 04-10-2011, 02:15 PM   #2
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you did this on a mspnp?
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Old 04-10-2011, 02:56 PM   #3
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Yes

Although several other guys in that thread did the same and it seemed to work. I just pulled the MS and it's exacrtly what was listed on the thread. Put in a spare coil I had and same thing, no fire on 1 and 4. So I guess I popped two coils in one day.
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Old 04-10-2011, 03:12 PM   #4
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Sounds like the mod for coil 1/4 was done incorrectly.
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Old 04-10-2011, 03:13 PM   #5
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Which one would that be ben? Pad 2 or Pad 3?
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Old 04-10-2011, 03:25 PM   #6
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Ok, well I just realized that I can't risk buying more coils and popping them as well. If someone can please send me a pic or diagram of the back of the 96/97 board so I know exactly where the jumpers go I would really appreciate it.

I even got my brother who does this stuff for a living and he agreed that it's wired exactly as the directions say, so who knows. Now I just want to get it back together and go back to dealing with the popping.
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Old 04-10-2011, 05:41 PM   #7
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1/4 is on spark B, which is pad 3.

You can test the output of your circuit with a multimeter. It should have 0V with the MegaSquirt powered up and engine not running. It sounds like you may have a short in your circuit which holds the output high and charges the coil until the coil fails.
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