Cranking but not starting
 

Hello all, sorry if this isn't allowed, but I am stumped and cannot figure out what is wrong with my setup. I installed noisymime's speeduino and got everything working in tuner studio, but when I go to turn the key, the car won't start. Here is my setup:

93 1.6
Stock Injectors/Fuel Pump
GM IAT Sensor
KIA variable TPS mod
MAF Delete
AEM 35-8460 Wideband (Grounded to ECU ground)

I'm thinking I'm not getting fuel, but when I jump fp/gnd in the diag panel, I hear the pump going. I also removed the fuse required for the ecu to control the fuel pump in the main fuse box. I don't hear anything when the key is first turned to "on" though, which is when the fuel pump is supposed to start for a few seconds?

I also got a log from TS while cranking that I will attach, but I'm not sure what to look for in it..

Thanks!

hey there brother. i am also on speeduino. and having starting issues, mine are more along the backfiring side of things and locking up.but mine will run eventually.

Ok your rpm values are way spiky. are you using the Speeduino mx5-pnp?

attach your tune file please.

also, have you updated your firmware, because the shipped july firmware had a major bug in it.

I have attached a barebones minimun speeduino basetune for a mx5 board.
This is setup for a 1.6 with stock injectors in factory batch fire mode

if you are running a different board make sure to change that setting under the engine constants tab.

the heck is a speeduino? a ms knockoff?

speeduino is an arduino based ECU, it is close to the mspnp 2 (maybe more like 1.5 lol) in terms of function, but is less than $200 for a pnp, and around $100 for a diy build.
Still uses tunerstudio, still does almost anything you can do with a MS, (launch control, idle control, flat shift, vvt control, etc) but definitely has to mature as a product.
I have a mspnp2 on one miata, and bought the speeduino for the other, gonna see how it stacks up.

A couple of questions...
How do you have your jumpers set on the main board? Your RPM is really all over the place.
What trigger filter setting are you using?
Can you post up your tune file please?
With the fuel pump, I'd suggest just leaving the jumper in the diag box for now until you at least get the RPM issue sorted and the car running. Much easier dealing with 1 problem at a time :)

Finally, I'd suggest updating to the August firmware (https://speeduino.com/wiki/images/c/...uino-Aug17.zip) as it has a few improvements to the starting on this CAS.

Hey man, thanks for getting back to me. After a bit of thinking about it, I remembered I forgot to take out the STIG fuse until about an hour into fiddling with it, because I was reading the instructions as "Take it out before trying to start the car" so I think I may have fried some of the speeduino :( I took a look at both boards, and nothing looks visibly broken, but I'll attach some pictures of it since I don't know what parts to look out for. I'll also attach my tune file. I daily it, but this weekend I'll give it another go with the August firmware for sure, thank you so much Josh!

bhop.

I took a look at your tune, i noticed a few things. first, and biggest issue, you had the crank trigger set wrong. it was set to 36 tooth.
i adjusted this setting to the 4g63/miata for you. i also set the injectors to semi sequential as following the instructions.

i also gave the rest of the tune a quick look over and it seems like you have most of the rest set properly. Obviosly you will need to tune all of the tables, but settings wise seems correct.

burn the tune below to the speeduino and you should be able to get it to fire up, if it stumbles try cranking about 1/4-1/2 throttle.

once running you may have to adjust your throttle set screw to correct idle.

Make sure to lock your timing advance at 10 degrees and verify base timing once you are sure you can start it. if it is off you can change the trigger angle value to correct for it.

It starts! Albeit, very rough, but it idles! I saw on my wideband it seems to be a little rich, and if I give it some gas it stumbles. When I'm starting it, it cranks until I give it some throttle then it fumbles into an idle. I attached a log of me starting it, hopefully it shows what I've explained. Thanks for the tune! I guess I just need to do some fine tuning, but tbh I'm not 100% sure where to start.

Also, I had to jump my fuel pump to ground to get it to start.. but that's probably because I fried something on the board when I didn't remove the fuse. Is it safe to keep this in? I know it won't start without it, but is it safe as a "permanent" solution?

Hi there, so sorry to bring this back up however I am having the exact same issue with the same setup!

i have tried using the maps here but nothing!!

Any advise please let me know!

Hey Bhop_alex,

Been a couple of years but any chance do you remember what was wrong with your PNP unit? I'm going through exactly the same issue as you did. Did you fried the board? I'm not getting fuel as well but pump comes on when i jumped the f/p and gnd.

Thanks!