OK so I have a 91 1.6 with a mspnp2. I got it dialed everything in and it has finally turned around for me with this project. So I had decided to clean the miata up. I degreased and cleaned the engine bay. Started it up it ran for about to min fine then it shut off. I was able to get it started again than it shut off and the relay packs on the driver side fender started buzzing like crazy so I shut the car off. I blew air in all connectors all dry. Now no start. I tested the coil pack and it's within spec primary and secondary. I checked plugs no water in boot. The plugs look fine . I also check the ground and it was tight however I didn't check resistance.
However I am getting no spark.

When I read the schematic it looks like the pcm feeds the coil pack directly. Why was the relay buzzing, could they be related? Any help would be appreciated.

I know I know I big dumb dumb. I tried to be careful around connectors etc. Oh and fuel pump is running and all fuses under hood and in car are good. The mspnp2 1,2 and 4 leds are on solid

 

Does it run on stock ecu?

 

Did you pull the ST_SIG fuse first?

 

So I got it running. I disconnected all connectors last night and blew compressed air in all connections and left them open over night. I put dielectric grease on the connections and connected everything, it started up. I think the culprit was the ignitor.

 

+1 for finishing the thread with a result. Too many threads are dead ends with no fix for others to find

 

Awesome!

 

Thanks , yes I read through a lot of threads and a lot had no results. So I wanted to help the poor soul who tested the basic stuff and couldn't find resolve. Luckily our cars are super basic