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Old 12-09-2007, 08:59 PM   #1
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Default dead coil-again

ok this really pissed me off
i installed MS again, the clicking noise that was there before is now gone (thanks soctt) so thats a good thing (harness issue), however the same coil just died again(cyl. 2-3), so therefore im pissed cause i cant afford to keep trying new coils over and over again...and did i mention i cant figure out whats causing it??? yeah!
so i need help and here is what i did
bone stock car basically without MAF
the map was already loaded and so was the firmware, so thats not what killed the two coils in both instances
after i plugged it all up and got the computer and MS communicating freely i went to try and start the car and the coil was already dead
so first attempt at starting the car and starts on 2 cyl. and i get the usuall half input on the tach while MS is showing actual input...so its clrearly a dead coil.
so i check for spark and indeed, no spark on #2-3, definitively dead coil again, same thing same coil as first time
what could be the cause of this?
some things i can think off:
bad firmware
bad base PnP 94-95 map
bad MS
bad harness
bad operator (me)

i know some of these can automatically be ruled out, so lets hear all suggestions please, i cant afford many more coils
fortunately the car can sit over the winter and if it is a bigger issue i got the time to sort it all out
thanks
dan

p.s. Ben, i didnt change any settings since you last touched it, so it should all be good...no?
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Old 12-09-2007, 09:21 PM   #2
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i wouldn't mind getting another glowing itrader feedback. i still have 2 good ones if you want one. and if i ever get around to doing the COPs i have for both my 94's i'll have another 4.
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Old 12-09-2007, 10:09 PM   #3
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haha, appreciate it, im thinking about COPs as well, but first i have to figure this **** out, its pissing me off not knowing whats causing the one coil to die, on stock ecu it was fine, soon as the MS went in it blew...
we can certainly work something out, but im not putting another coil in there till i can figure out whats causing them to blow...
in the mean time ill try and get to making those PnP harnesses (if thats what you want to call it) for the COPs
i hope someone will be able to pin point this problem, i want to start tuning that damn thing and i cant even get it to run on all 4 cyl. yet

i did spend some time this weekend tuning my friends NB with the EMU, that was fun so i've already been bitten by the bug and need my own fix
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Old 12-09-2007, 11:02 PM   #4
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That sucks.
I'd be looking for a hardware problem on the spark output of the ms.
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Old 12-10-2007, 01:27 AM   #5
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make me a nice PNP harness for my COPs and I'll owe you.

i was thinking of just going to a pick&pull and grabbing the harness of a corolla
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Old 12-10-2007, 11:57 AM   #6
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you wont owe me...i think ill try to get started tonight
where can i buy a cheap dremmel and cutting tools? HF? ill let you know tonight how it goes...
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Old 12-10-2007, 01:22 PM   #7
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Dan, if you wanna send the MS back this time I'll go back over that as well. I dunno what the issue could be, but you never know. Sorry about this, this just completely ruins your MS experience.
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Old 12-10-2007, 03:14 PM   #8
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:( tell me about it
before i send the MS back, how can i make sure that all else is well
ill PM you a thought...
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Old 12-10-2007, 03:37 PM   #9
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dwell settings? thats what killed both of my coils.
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Old 12-10-2007, 03:50 PM   #10
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ok...thats what im thinking...so i need to talk to someone who has a 94 and see what their settings are, maybe thats it, and if not it will further narrow down the problem...
now i need someone with a 94 to help me
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Old 12-10-2007, 04:20 PM   #11
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no, I don't think it's your dwell settings, because the same coil fried immediately again. it's the fact that the failure was immediate that makes me think there is a hardware issue.
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Old 12-10-2007, 05:45 PM   #12
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the hardware as in MS or the harness?
excuse if im asking the obvious!
this really sux, Ben, you remember what we did, at start up the coil was already dead, same thing happened again, first start and the coil was dead...****
i hope i get this straightened out cause it doesnt look very good as of now...
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Old 12-10-2007, 05:50 PM   #13
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I would look at the MS for a difference in the spark outputs. I don't know what is involved in modding a MS board for the miata, but a simple error like transposing legs on a transistor could cause all sorts of havoc. If you don't see anything obvious, then a stimulator might be useful.

I'm sure Scott will take care of you. And you could even send it to DIY, if worse comes to worse. Their shop fee is reasonable.

But yeah, that coil failed fast. It was dead before the car started the first time.
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Old 12-10-2007, 06:23 PM   #14
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i've been talking to scott and we came up with a game plan in diagnosing everything that could be wrong
we may have a solution as early as tonight when i get home, Scott has been very helpful in aiding me with his knowledge...many thanks to you man
cross yo fingas everyone
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Old 12-10-2007, 08:55 PM   #15
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Quote:
Originally Posted by whaaamx5 View Post
ok...thats what im thinking...so i need to talk to someone who has a 94 and see what their settings are, maybe thats it, and if not it will further narrow down the problem...
now i need someone with a 94 to help me
I don't know dude, our MS's were made in the same batch, we both have 94's and the same problems... Most of mine are fixed... (all but the mis-fire)
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Old 12-11-2007, 11:11 AM   #16
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should i drop another coil in the mail?
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Old 12-11-2007, 11:22 AM   #17
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yes please...
but i am not giving it another go until i can figure out what killed the first two
im also gonna start piecing together a COP set up, but it may take some time
thanks paul
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Old 12-11-2007, 03:36 PM   #18
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Merry Christmas FTW.
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Old 12-11-2007, 03:56 PM   #19
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i have two x-masses..muahaha
just so you know
one is in Jan. 7th
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Old 12-11-2007, 08:36 PM   #20
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I would skip another coil, Just go for COPS, These ignitors in the 94-97 are very sensitive, believe me I've smoked what, 4 sets now between 2 cars??? ( I lost count)...
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