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Old 09-13-2013, 11:17 AM   #1
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Default Megasquirt 1 No spark after "Joesparkmod"

Hi guys.
I have a 1990 Jap Roadster, megasquirt 1 v2.2, LC-1 wideband sensor, T3/T4 turbo, and BMW TPS. I had the car running on the old spark mod, but only with the spark inverted = yes.
This caused the ignitor module to get too hot to touch and burn out, so I did the Joe spark mod and fit a new ignitor module, now I have no spark. I've ordered another ignitor module just in case, and I recently fitted a new coil pack.
I've trawled through the other posts in this section and found one that related to my problem, but his was sorted with swapping Spark inverted = No.

Can anyone shine a light on this for me?
Cheers
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Old 09-13-2013, 11:21 AM   #2
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Did you change to inverted=yes after the mod?
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Old 09-13-2013, 11:24 AM   #3
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Yeah I did make sure inverted=yes
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Old 09-13-2013, 12:26 PM   #4
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So it's worked opposite of how everyone else's has worked?

We usually go from No to Yes with this mod, but you're saying you've gone from Yes to Yes after a mod?

Definitely something fishy. Post pictures of the two sides of the board.
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Old 09-13-2013, 12:34 PM   #5
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Yep, would only work with inverted=yes when I had done the old mod, and now with the improved mod it wont spark.
I'll get a picture and upload it after work when I get home.
I had the help of an Mx5Nutz forum member (MrSlow) when I started out with the megasquirt.
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Old 09-13-2013, 12:51 PM   #6
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Just thought I'd post this while I remember to -

I have the 2N3904' wired as
Earth to Q9
Base to "-" side of D17
Collector to 1/4w resistor connected to pre R23 (1/4w resistor then goes to X12)

The other is wired the same but on Q11, D19 and R27 (1/4w resistor then goes to X11)
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Old 09-16-2013, 05:41 AM   #7
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Okay, sorry for the delay in posting the pics. I've had no internet over the weekend.
Here are the pics of the top and bottom of the board.



Attached Thumbnails
Megasquirt 1 No spark after "Joesparkmod"-zldykz.jpg   Megasquirt 1 No spark after "Joesparkmod"-161miow.jpg  
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Old 09-18-2013, 02:13 PM   #8
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Went back to the old spark mod and I have spark again with inverted = No, it just wont catch and idle (had it running as Inverted = yes previously).
So confused......not anymore, it's a timing/trigger angle issue now.

Last edited by Cal22; 09-18-2013 at 03:00 PM.
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