msydnor

iTrader: (3)

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.

Braineack

iTrader: (62)

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.

msydnor

iTrader: (3)

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?

Braineack

iTrader: (62)

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.

msydnor

iTrader: (3)

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.

Joe Perez

iTrader: (8)

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...

msydnor

iTrader: (3)

Joe, do you know if the coils going out would account for the not strating when hot?

mikeflys1

iTrader: (2)

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

Joe Perez

iTrader: (8)

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.
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.

MX5Kuro

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.