rusefi.com

So I brought my car to a mechanic specialized in Miatas, and he couldn't figure out what is happening either. We tried jumping the fuel pumps, pumps run but fail cranking. Now we both think that either the configuration is not right or the ECU itself is probably faulty...

I am thinking about jumping the fuel pump relay on the diagnostics port tomorrow when I have light. So Stefan do you know why the pin 1C is not hookup up? I think that could be used to control the fuel pump: https://www.diyautotune.com/support/tech/hardware/diypnp/documentation/application-docs/1990...

Hi all,

I think it's the fuel pump, because I just tested spark at 11pm when it's very quiet, and I can clearly hear the sound of sparks. Tried cranking for 30s, no avail... so it's probably some signal from the ECU to the fuel pump (Circuit Opening Relay?) that is not hooked on the rusEFI board.

This is a longer crank (4.3s). https://rusefi.com/online/view.php?log=39

Please disregard the last portion, I turned off the ignition and the RPM readings go crazy...

I tried cranking for about 3 seconds, no avail... I have only stock o2 sensor but I think that will not affect cranking? I can test later with a wideband tho. BTW, stock cranking is <0.5s.

Another (slightly longer): https://rusefi.com/online/view.php?log=38

I have recorded the log here: https://rusefi.com/online/view.php?log=37 > One more question: Does TunerStudio show an rpm when you are cranking the engine? Yes > Have you noticed the "bench test" buttons in TunerStudio? you should be able to hear both injector and spark tests - injectors a...

I tested the two spark outputs, the LEDs associated with the COIL1 and COIL2 are working.

My stock ECU is a DENSO "remanufactured" B61P-18-881R, just fyi.

Completely out of ideas now...

I switched back to stock ECU board, and the car runs perfectly. So it's either a configuration issue or a H/W fault in the rusEFI board.

Yeah I tried that, but there is no spark-the injectors are working normally...

I did some more experiments, and I think I found a problem: There is a strange looking "starter disable" circuit hooked on the big harness on top left of the engine bay (which is on "BYPASS", so I can start the vehicle without issue with the original ECU). When the "starter ...

I am able to load the NA6 preset to the board with Andrey's method - now it still does not start - I think the fuel pump is not working, is there a way to test it and what may be the problem?

Hi all, I am currently experimenting with the Miata 48 pin board for MRE (version 0.2) board. Just got it installed, tried cranking but not starting :( My current configuration: * All stock * Vacuum line for MAP tee'ed from the FPR Problems I encountered: 1. Using the Micro USB connection, writing a...

Hi Andrey,

I wonder if that includes the main rusEFI board of just the carrier?

Thanks in advance!

Hi all,

Is there a way to get the 0.2 MRE board either preassembled or kit? I have a 91' NA6 which I am planning to go boost with.

Thanks in advance!