Hello, I have a new to me 1990 miata planning to go turbo. In order to learn how to tune an minimize errors when installing the turbo I decided to install MSPNP Pro, wideband, and IAT before going turbo. I am trying to get the car to start on the base map straight from the website, I changed the settings I needed too (as far as I can see). Car engine wise is completely stock just with a wideband and no MAF. Attached will be my cranking logs and current tune. Any help will be appreciated. I had the same issue on my old miata, but due to moving for a new job caused me to postpone until I have time.

 

Have you tested for spark and fuel? Make sure both are present before continuing. If you had the same issue on the MS and stock ECU then it has to be something else. I would recommend getting the stock ecu back in, check everything over and determine the cause of failure. Once it is running then swap in the MS and confirm it isnt any settings in MS.

 

sorry for the confusion, I had the same issue with my other Miata back in March. The new Miata was running on the stock
ECU 2 days ago. It’s all healthy before swapping in the ECU.

 

Where did you get your base map?

 

MegaSquirtPNP by DIYAutoTune.com

 

Good stuff. And just to confirm, you used the '90 to '93 map?

I'll take a look at your tune in a bit... just want to rule out any obvious issues first.

 

Try setting the Ignition Options > Ignition Input Capture to Rising Edge instead of Falling Edge and see if that helps?
That looked like the only real difference between your map and the default base map.


Also, did you make sure to check your timing with a timing light, to ensure that 10 degrees of fixed equals ten degrees of actual timing?
If not... here's a great link with how to accomplish that.

How to Check and Set Up Base Ignition Timing

 

I appreciate you taking the time to look at that for me, I did cycle between the two last night to no success. I have a timing light but I haven’t check during cranking to see my timing. I’ll do that today when I’m back at home, maybe the timing is just way off? Let’s hope that’s the issue

 

If you switch between rising and falling the timing will have to be reset with a light.

 

Alright, I’ll check and set it when I’m home. I’ll update if it works or not.

 

I have fuel and spark, timing was between 14-10, put in the stock ECU and boom started like no problem. Rough idle but I assume that's due to the wideband, feels fine when revd up.

 

logs

 

I had switch back to the stock Ecu, it has been running fine since! However, now with summer heat I want to get the turbo kit up and running. I plan on running the car stock with megasquirt First. I installed everything back on today, wideband MTX-L, IAT, megasquirt, and removed the fuse. I’m cranking but still have no start. I provided logs below of the start up attempts, composite, sync, and the graphs during cranking. Any help would be appreciated.

 

I have a good smell of fuel, I think I might have a lot of cranking fuel, I’ll try backing down the fuel, injectors are set for 230cc.

 

Here’s something weird, I assume it means my engine is flooded. When I in unplug the injectors from the harness the car starts and idles for a bit before dying, not smooth idling but it at least catches. Would this mean I’m seeing to much fuel in the cylinders? Even with throttle open and injectors plugged in I get no signs of catching.

 

Finally have some answers to this mystery, brought my car to Advance Engine Dynamix even Toby could nkt
get it to run! Once we plugged in a new MS2 it worked flawlessly, it was the ms3 the whole time! We did found it weird that the car would start with all the injectors unplugged, associated this with a stuck injector.... but when we hooked the injectors up to test bench all injectors were good.