I've assembled a MS 2 from DIY autotune and I am having issues with the RPM being synced and I do not believe I am getting any spark. The engine will turn over and everything car and MS wise seems to be working other than the RPM/CAS and spark. I can hear the fuel pump start when i power on the MS, my TPS works, and the MAP works. But when i try to use a timing light to check the timing the light doesn't ever strobe, which I believe means there is no spark being sent. My RPMs when cranking are 200 and then right back down to 0, there is also sync loss happening during cranking. Tuner studio settings are set to 700 for the crank rpm.

I followed the guide off of miata turbo FAQ for the MS 2 assembly. I will attach the photo of the back wiring that I followed for the options that I did/ mods

I've researched and researched but I've had zero luck. I really hope someone will be able to help me

I am also attaching the composite log that I've gotten during cranking


Front

Back



harness diagram that I followed

 

Update: I took out and visually inspected the spark from my spark plugs and they do in fact have spark. However they all spark once when the MS is first turned on with the key. Hopefully that's normal. But after the initial boot of the MS they don't do anything weird and when i crank it, they all spark like they're supposed to. Im kinda at a loss on what to do

 

Do you have Megalog Viewer? Take some logs of it being cranked and post them here. They will likely be informative.

 

totally forgot to attach that as well. here :

 

Showing a Lost Sync code of 38 = 4G63. You should take a composite log and post it here.

A quick search:
https://www.miataturbo.net/megasquir...38-4g63-69396/

https://www.msextra.com/forums/viewt...?f=101&t=46929

I'm sure there's more.

 

I believe I've figured it out. If anyone uses the same diagrams, the Tach circuit is completely wrong. Consult the MS2 V30 Hardware manual for the 4G63 CAS to see the modifications needed

 

The log I attached was my composite log. It wasn't picking up the cam input because the tach circuit was wrong. I have fixed the circuit according to the MS2V30 hardware manual.

I did search around for resources and came out fruitless. But I appreciate the reply.