(Batch fire) Only cylinder 2 and 3 has spark, but not 1 and 4. How to correct? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 04-10-2014, 10:43 AM   #21
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should be pin 33.
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Old 04-10-2014, 10:53 AM   #22
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Spark B is top connector, bottom row, pin 33

Looking at it from behind, 5th from left

(Pin reference is based on the tiny stamped numbers on the megasquirt side)
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Old 04-10-2014, 11:04 AM   #23
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edit: interpreted incorrectly

Last edited by psyber_0ptix; 04-10-2014 at 03:33 PM.
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Old 04-10-2014, 11:25 AM   #24
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no, i was saying spark b should be pin 33--so the MS harness is correct.

All the sparks are driven off the same integrated circuit on the expander, I'd be hard pressed to think Spark A is working, yet Spark B is not.
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Old 04-10-2014, 11:49 AM   #25
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Spark C and D are dormant if using wasted spark?

If not, and Spark A and C are firing at the same time, maybe I can switch the trigger source to run wasted/batch. But that probably means I'll never be able to run sequential.

Anything on the megasquirt itself to check whether it be software or hardware?
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Old 04-10-2014, 11:57 AM   #26
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Quote:
Originally Posted by psyber_0ptix View Post
Spark C and D are dormant if using wasted spark?
on a 4-cyl, yes.

IIRC it's wired:

A - 2/3
B - 1/4


You're absolutely certain in output test mode you can't get anything when testing spark b? and that spark b goes all the way from the coil trigger (yellow or yellow/brown) back to pin 33?
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Old 04-10-2014, 12:03 PM   #27
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Both cylinder 2 and 3 fire when I test Spark B OR D in output test

Nothing happens for cylinder 1 and 4 when trying Spark A or C

Continuity is good from the coil plug all the way to the ECU pin for both Ignitor wires: Brown and Brown/yellow
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Old 04-10-2014, 12:07 PM   #28
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okay, sorry, so it's spark a not working... hmmm.
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Old 04-10-2014, 03:50 PM   #29
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So from what you said earlier, there shouldn't be any reason why Spark A isn't working if Spark B/D are.

So that means it would have no effect if switching to Wasted COP, activated Spark-A/C and Spark-B/D simultaneously, to try to use Spark C as the trigger instead of wiring to A?

I don't understand the logic if that would work, yet Spark A doesn't work independently if they are part of the same integrated circuit.

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Old 04-10-2014, 04:05 PM   #30
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im curious as to why Spark D is doing anything...Did you wire Spark D from your center connector into your cop harness?
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Old 04-10-2014, 04:16 PM   #31
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Spark D is run to one of the unused wires in the modified ignitor, but not actually wired to anything. I wasn't sure of why it did anything when cycling through the output, if it was set to wasted spark. It makes me wonder if this was to allow for a wasted setup to work even if the COPS are wired for sequential...without shifting or pairing wires as we do for the 1.6L

..but again, does not explain why A and C aren't working.

I feel like I'm missing something real stupid in the setup within MS. Patiently waiting for that "eureka" moment once it's all sorted...but I feel in over my head now. Swap and install only took 1 day. Figuring out how to start the car....5 days and counting.
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Old 04-11-2014, 09:37 AM   #32
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post this over at msextra.com, cause i'm missing that moment as well.
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Old 04-11-2014, 10:03 AM   #33
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Just set up an account but waiting for admin approval for first post. I'm really desperate to the point where I wonder what it'll take to get this running on MS1.
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Old 04-12-2014, 09:23 AM   #34
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From reading this thread:
Megasquirt MSEXTRA / MS3EFI • D14 "spark A" Not Working- Not Grounding - MS2/Extra v3.0 (View topic)

I know it's MS2, but is this something common that even new daughter boards or expansion boards are sometimes faulty?
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