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Old 08-25-2012, 01:05 PM   #1
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Default Installing 2002 Coils on 1990 wiring

I am in the middle of swapping a 2002 engine in my 1990.

I want to connect the 2002 coils on with my 1990 wiring and MSI ecu.

At first, I had the idea of connecting them like they were COPs, but they don't have tach signals, which mean I need to keep my Igniter.

Here comes this idea.

-Why could I just plug them as regular coils and kept the 1.6 igniter?

I took a look at the 2002 and 1990 electrical schematic and I put my thought into a schematic

:


I would like to have the approval/comments of the electronic genius in there.

I think the trigger sent by the igniter should be just fine to trigger the Coils pack, just like if they were triggered by the 2002 ecu.

And this way the igniter will still send the Tach signal to the dash.

Thank you


Good day!

-Marc.
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Old 08-25-2012, 02:00 PM   #2
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Throw away the igniter, use the MS1 tacho circuit to drive the tacho in the cluster.
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Old 08-25-2012, 02:34 PM   #3
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I dont know why I did'nt think about it!
Thank you reverant!
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Old 08-25-2012, 09:19 PM   #4
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I am doing the same thing. Please Please post details of how you do the: use the MS1 tacho circuit to drive the tacho in the cluster.

Which color wires would be what at the coils?
Where do I pick up the tach wiring for the dash tach to splice it into the megasquirt?


I am doing the same swap and having been searching to figure this out with no luck. Please help
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Old 08-25-2012, 09:25 PM   #5
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Well, I guess I'm gonna take the tach signal wire at the igniter and plug it at the tach output on the MS1.

I'm gonna do updates on this thread .
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Old 08-25-2012, 11:47 PM   #6
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Yes please update the thread.
does diypnp have a tach output too?
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Old 08-25-2012, 11:49 PM   #7
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Oh and which letter/color wire is the tach wire at the ignititor
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Old 08-26-2012, 12:19 AM   #8
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google is your friend:

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Old 08-28-2012, 03:42 PM   #9
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So I run a wire from the yellow/blue and black/white ignitor harness on the 90 miata and I splice them and run them to the tach output on the MS Diypnp.
Then I run the Brown and Yellow to the coil 4&1
and I run brown the 3 & 2
Then reset the dwell for the 04 coils and that should do it?
What is the right dwell for 04 coils?
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Old 08-28-2012, 04:20 PM   #10
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take the tach wire from the ignitor, solder it to the wire that controls the nearby purge solenoid. wire tacho output to purge solenoid wire on harness

doneeeeee.
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Old 08-28-2012, 07:26 PM   #11
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I cannot remember, will I want to use the purge solenoid?
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Old 08-29-2012, 12:41 PM   #12
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I am running wire into the cabin anyway for the VVT controler but that is a good idea. besides I have not idea what the purge solinoid is or what wire on the harness corispondes to it.
But I was hoping to use stock wires to get the coils signal to the 04 coils. I figured that would be easy enough since I am still running waste style coils like factory. So just run:
Then I run the Brown and Yellow to the coil 4&1
and I run brown the 3 & 2
What do you think of that idea absRTP?
I also wanted to thank you for posting this stuff. It really has helped me get my head around whats involved and answered questions I could not figure out. THANKS!


What is the right dwell for 04 coils?
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Old 08-29-2012, 07:07 PM   #13
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If you are using an aftermarket ECU you can send the tach signal from the ECU via pin 2I (B/W wire) (pin E at the igniter) and you can wire it to pin D at the igniter to send it to the instrument cluster.

-Raj
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Old 09-05-2012, 02:08 AM   #14
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So the DIYPNP puts out a tach signal I wire that to the black and white pin 2i at the harnes or I have to run the output on the ecu to pin d on igniter. Which one?
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Old 09-05-2012, 07:35 AM   #15
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Wire the tach signal from the ECU to pin 2I at the harness and wire the pin E and pin D together at the igniter.
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Old 03-08-2013, 04:01 PM   #16
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But is it possible to use the vvt coils and keep the 1.6 igniter?
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