I seen this question posted before and have tried just about everything...

Car: 97 Civic LX with B16a swap Turbo.
Hondata s300
Walbro intank
RC 750 injectors
MSD Billet Dizzy with external Coil
Engine is built top to bottom

As title says, Car starts fine and after it warms up and without warning, it turns off. If it sits for 10-15 minutes, it starts and run fine again until it get warm again. Never ending cycle...

What Ive done so far:

Replaced Battery
Tested Alternator
Replaced key switch in the past...
Tested for spark when it would not start (Past)
Tested fuel system pressure when it would not start (Pump primed several time and pressure holding at 40psi)
Changed dizzy and coil
Swapped injectors to stock
Tested voltage at injectors
Cleaned IACV then replaced IACV

Is there another sensor that I need to focus on and test?

I'm stumped. Has anyone find a solution to this problem? Currently I am waiting for working ECU to see if that might be the cause... but looking for some alternatives or solutions.

Thanks

 

CEL codes? Does the CEL remain on after engine stalls and when trying to restart??

When the engine stalls, is all electrical power lost?

After the engine stalls, does the fuel pump prime and is there bright white spark at all 4 plugs?

 

There are no cel codes. I data logged the car several minutes before it cut off and it continued to data log, no fluctuation of lights, car just stalled.

When I did test for spark, it seemed weak in my opinion, but it sparked. More testing in the morning to compare cold spark to spark after it stall.

Pump primes after it stalls also. WALBRO in tank is loud...

Thank for the response.

 

Update for those that may encounter the same problem:

I tested fuel and spark and could not find the problem. Spark was questionable, didn't seem to fire right but it was firing (seem long between sparks when cranking). So I swapped to stock ECU and what the hell! Car stayed on! So then I set all settings to stock on s300 and the car shut off after getting warm. So after a few cranks of not starting, i quickly swapped ECU, 30 seconds max, and it started.

So with that said....what the heck is up with my s300? Anyone had issues with theirs? and is there a firmware update or someway to fix it?