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Old 02-09-2008, 07:02 PM   #1
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Default Coil Packs Fried? JP-8???????

Been having issue with my car not starting when hot. (2004 MSM) with EMU. Wont start at all now. I'm starting to think I fried the coils. I had JP-8 set on 1-2 which is 5 volt. From looking around some more, looks like there is question on which it should be. How do you know if your coils are gone? I unhooked the EMU and still no luck. Thoughts.
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Old 02-09-2008, 07:09 PM   #2
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if your coils saw a constant 5v they are most liekly dead. easy test is pulling one plug, laying it next to a ground (like the engine hoist point) and trying to crank. if you don't got spark, you most likely burnt out the coils.
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Old 02-09-2008, 07:32 PM   #3
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Quote:
Originally Posted by Braineack View Post
if your coils saw a constant 5v they are most liekly dead. easy test is pulling one plug, laying it next to a ground (like the engine hoist point) and trying to crank. if you don't got spark, you most likely burnt out the coils.
So guess I should have been on 12 volt....EMU has been set to 5 volt for almost 2 weeks. Would thay explain why it wouldn't crank when it gets hot?
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Old 02-09-2008, 08:49 PM   #4
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i dunno much about e-manage, sorry. i just know if a 5v supply was given through the trigger outputs to the coils it would kill them fairly instantly.
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Old 02-09-2008, 09:31 PM   #5
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I had heard about coil pack getting fried with Emanage, but thought I had done the appropriate research to determine if my MSM was 5 or 12 volt. After the fact, I guess my research efforts were flawed.
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Old 02-09-2008, 09:57 PM   #6
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Brainey, they weren't seeing a constant +5. The jumper in question (JP8) determines whether the active high voltage (momentary) is +5 or +12.

There was a lot of debate on this about a year ago. Emilio and others said that, despite the instructions, you needed to set the ignition trigger voltage to +12 or you'd fry your coils. I went out and put a scope on my ignition trigger lines however, and determined that the stock ECU output a +5 signal to trigger the igniter.

Further research revealed that all the nay-sayers had 1.8 cars. So a few people scoped the ignition trigger on their 1.8s, and lo and behold, those cars all used a +12 trigger.

So the general rule for EMU seems to be +5 for a 1.6 and +12 for a 1.8. Nobody had fried any coils in this configuration so far as I know.

This puzzles the **** out of me because as far as I know, all the MS users are using the standard +5 pullup, and I haven't heard of any 1.8 users killing their coils yet...
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Old 02-09-2008, 10:07 PM   #7
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Joe, do you know if the coils going out would account for the not strating when hot?
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Old 02-10-2008, 01:05 AM   #8
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I ran my 99 for a few weeks on 5v before i scoped it and changed to 12v and it didnt seem to matter either way. The actual signal scoped between 9 and 9.5v so maybe the 1.8 coils just have a pretty wide tolerance.....or i was just lucky

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Old 02-10-2008, 01:04 PM   #9
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Quote:
Originally Posted by mikeflys1 View Post
The actual signal scoped between 9 and 9.5v so maybe the 1.8 coils just have a pretty wide tolerance.....or i was just lucky
This, I believe, is due to load. On my car, it was a sloped signal that got up to about 4v. When I disconnected the igniter and measured the trigger line unloaded, I got a solid 5v square wave.
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Joe, do you know if the coils going out would account for the not strating when hot?
Honestly, I have no idea. I don't truthfully even know whether it was the coils themselves or the integrated igniter that was breaking down.
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Old 02-10-2008, 06:04 PM   #10
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Default 12v

I'm driving with the 12v setting for some time now without any problems. The MSM is a 1.8 BP-ZE with modified internals so it's my educated guess that you should use te 12v setting too.
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