Oh, that sucks... frying chips.

So, I made a mistake when initially reading the wiring guide for 420a from symtech, as well as various other guides I have read.

Hopefully you got it right, but I made a mistake.

My mistake, which I'll hopefully fix in my youtube videos soon, is that I power the MS, coils, and injectors all from the same ignition switched line. (via a relay I added).

The problem is that if the MS loses power (by pulling or blowing the 2A fuse), it will allow a ground path to coils/injectors, which is bad, because that is basically the "on" state, which can blow up injectors, especially low Z.

The solution is simply to follow the guides and don't mess up like I did. That means wiring the system so that the fuel pump relay provides the power to the injectors, the coils, and of course the fuel pump. On our cars you can use the ASD relay as well, but I won't go into that, symtech has a writeup.

So, that way, if the MS ECU ever loses its power, the fuel pump relay will not have power. As I'm writing this, however, I'm realizing that the fuel pump relay pin is a P-Type as well, so wtf, I'm losing my mind I think.