99 miata crank but won't start
 

Just finished installed MS2E. It was originally configured for 700CC injectors. I changed the tune to 350CC injectors. I still cannot get it to start.

It was crank but not fire up. I've attached a copy of tune and log while trying to start.

Any ideas would be greatly appreciated.

I'll be the first:

Get us a composite log while cranking

When I was trying to do the composite log, was getting a lot of data empty messages. Let me know if this what you need to look at.

Also are there any other changes that need to be made when changing the injector sizes? I bought this but it was never installed. But the tune was setup for larger injectors. All I did was change the CC size from 700 to 350.

I am making progress. Car starts but dies after 3-4 seconds. Almost like all the fuel has been cut.

What are your AFRs looking like when its dying? Is it leaning out?
Your ASE (After start enrichment) or WUE (Warm up enrichment) could be incredibly out of tune if they're from a basemap (and if you're not running stock injectors it can also be funky).

I will have to check it out today.

Here are my ASE and WUE graphs. I may also need to change my injector dead time. I am running 350CC EV14 fuel injectors.
Dead time is set at 1.0
Battery Voltage Correction is at .2

So I tried it again today. I moved my calculated fuel slowly from 8.6 to 10.5. The only thing it did was make it stay alive longer.
What i am noticing is that when it is dying, it is on the rich side, 11 AFR. I am getting the spark cut to go red in turner studio.
I plugged in the stock ecu and it fired up and idled without any issue.

I am using the base map that came with it from Rev (I bought the ecu from another user). Could the VE and Ignition Tables be off? The base map originally included was for 700CC injectors. My injector size is 350cc. My guess is I need to reduce the values in the VE table to better match my injectors.

I am still getting the situation where it starts, goes for 4 seconds, then dies. When it dies i notice that the AFR is 21.7 but I think the reason for that is my gauge AEM 30-4900 is going through a boot up because the car has just started. Is the ms2e recognizing the high AFR and shutting down the car? Am I on the right track?

Well after working on the tune for a few hours last night, the car will start but only idles for about 4 seconds before dying. So basically I got no where. Can someone much smarter than me look at these screen shots and let me know if there is anything obvious that is wrong with my tune?

Do you notice loss of sync?In the logs you posted, some cam sensor errors were reported.
Why do you run 31Hz as idle valve frequency? Do you use a seperate board to multiply that? Nb valves run more like @480-500Hz

I kept the idle valve frequency because it was like that on the base tune. I think the Ms2e's do have a something that multiplies this number. I can try and set it to 480-500 and see if it does anything. In regards to the cam sense error, what is the best way to troubleshoot? Should I think about changing out the cam positioning sensor?

When I put the stock ecu back in it idles fine.

For the cam sync, you can attach a composite log of the car starting and running until it dies.(Try again)
For the idle valve, is it perhaps too noisy with current frequency?
You can try to unplug the iac valve and see if it idles just off the tb idle screw(you will need to loose the bolt a bit most likely)
You need to calibrate your iac valve anyway.

Thanks for the information Akina. In order to calibrate the iac valve, don't you need to the engine to be running? I will try to get a composite log today.

Yes, you need the engine running, then use the idle valve test mode to find out the operating DC% range of your valve and fill the data in your closed loop idle settings and initial values table.

Hopefully I can get the engine running today to fill in the data for closed loop setting. Right now I am using open loop to just try and get the car to idle.

Really getting frustrated with this. Today I was able to get the car to start a few times, ran really rich for about 4-5 seconds, then died. Tried to make some changes and now it won't start at all. I wasn't able to get logs when it was starting. I did get logs "trying" to start it. I've attached those.

After I was unsuccessful in getting it to start, I put the stock ecu back in and it started easily. I swear, if i could pay someone to give me a tune that would work well enough to get this car to my tuning shop, I would pay them.

Need some help on some starting values for the Fuel VE Table. The injectors are EV14 350cc. They came with a kit but here is a link to them: https://gramsperformance.com/g2-99-0123.html

I's using 1.1 as my injector dead time. I've tried everything from .5 to 1.2 and nothing seams to work better. My idle values for Fuel VE Table 1 are around 70. My required fuel is 8.6

If anyone can point me in the right direction I would be so happy. I've read through the manuals but I couldn't figure out how to come up with the correct starting values for the Fuel VE Table. Also I grabbed the Cranking Pulse / AF Enrichment from a post I found by Braineack.

If there are any tuners out there that think they can help me, I would be more than happy to compensate their time.

Try using falling edge as ignition input capture.

Thanks Akina. I was looking online and for a 99 Miata I think it is supposed to be rising edge.

Atleast according to this page: https://www.diyautotune.com/support/...0-mazda-miata/

repost

You may want to just break down and pay a professional to help if you are stuck. I ended up hiring Ken Hill to help with my Hydra. Not sure if he does MS though. Ask on here and I'm sure someone can point you in the right direction.