Jordan

Hey everyone, I'm wondering if someone can help me get my MS2 going. I just built a DIY MS2, everything worked fine on the stim so I tried starting my '90 1.6 with it but I couldnt get it to start. It cranks, I'm getting good RPM and other sensors appear to be working correctly but it won't actually start. The lights on the board are always on.
I've attached my .msq and a log of me cranking.
July_30_90miata.msq
2016-04-18_08.31.56.msl
Could it possibly be a wiring issue? I've tried searching and i've been playing with settings but still no success. Any help would be appreciated. Thanks.

Matt Cramer

Check to see if it will give you a spark in output test mode.

retrothis

I'm a noob myself, so here is a pinch of salt .:. Looking at the log, why is the TPS slowly increasing as you are cranking? Are you slowly pushing on the pedal? It look very linear and stable...

Jordan

It won't spark in output test mode. I'm using a timing light and I know I was getting good spark on the stock ECU the other day so it's definitely got something to do with the MS2. I never really noticed that TPS reading. The TPS works fine when using the stimulator, not sure why it's increasing like that...
I thought maybe I overheated the transistors or something so I swapped them out with new transistors and wired it all back and I'm still getting the same issue, so unless I soldered it wrong twice I dont think its the soldering on the transistors or 270 ohm resistors. I used the wiki page to build it - Megasquirt 2 Assembly - Miata Turbo FAQ
Also I turbo'd the car a few weeks ago but I was having the same issue before I turbo'd it. If I really have to I can put the stock manifold back on but it's not the reason I'm not getting spark.

Matt Cramer

Can you post a picture of how you assembled the spark output circuit?

Jordan

I noticed I had not wired IAC2A to JS7 like they have in the picture in the wiki article. Not sure if it has anything to do with spark output but after I resoldered the transistors and wired IAC2A to JS7 I have the lights flashing when it cranks now but still no spark.



I've got two 270 ohm resistors attached from R24 and R28 to the bottom pin of the 2n2222 transistors.




Not the best soldering...




Closer look. Bottom transistor to IGN, top transistor to IAC2B. Top pins go to ground. Middle pins go to LEDs.

Matt Cramer

Bench test it. Do you have 0V with spark output set to going high and 5V with spark output set to going low.

Jordan

Well I didn't have much time to test it today but I did test a few things. On going low, I got 2v across the LED's and 0.7v on the middle pin, and from the ground pin to the bottom pin I got 0.3-0.4V and 4.6V across 270 ohm resistor. So that's when I set it to going high but I realized I wasn't getting an RPM reading in Tunerstudio. Nothing changed when I put it to going high. So I tested the other transistor and on both going low and going high I was getting 0.01V from ground to bottom pin on transistor and 5V on 270 ohm resistor. I'l try and figure out why I'm not getting RPM tomorrow but it was reading fine yesterday. Should I be testing anything else? It seems like I wired something wrong but from all the diagrams and pictures it looks right. Any input would be appreciated.

Jordan

So I completely removed all of the jumpers and the spark output mod and redid it and nothing has changed. Im getting consistent rpm of around 260 while cranking, everything is synced but I'm still not getting any spark. Does anyone have any ideas on a different spark output or something because this just isnt working. Not sure what else to try at this point.

Braineack

iTrader: (62)

because you have a 1.6L and the input floats to 12v?



UGH THAT PICTURE!!!!!!!

USE 20-22AWG WIRE!!!!!!!!! That wire could power a 700watt amplifer...

Jordan

That's why I redid all the jumpers. Thats the smallest wire I can find anywhere but I ended up using some leftover from the harness wires. Any ideas why I'm not getting spark?

retrothis

That spark output mod, is it designed to be wired to the igniter or directly to the coil? Can 2N2222 transistors drive spark directly? (This was my issue. I originally wired the Spark A and B to the igniter, not realizing I had to wire the output directly to the coil; HOWEVER, my MS2 came with an expansion board and some massive heat-sinks around the transistors (NOT 2N2222)).

retrothis

Wiring, grounding issue with Jordan's MS2?

Braineack

iTrader: (62)

The wiring, as nasty as it is, SEEMS correct. double check you haven't accidentally soldered all the three legs of [any] the transistors together.


Can you post your:
MSQ
composite log during cranking
datalog during cranking

Braineack

iTrader: (62)

He's not driving spark directly...

Braineack

iTrader: (62)

No, a normal MS thing an experienced user knows. This is why on 1.6L setups, where you don't have a vTPS, it is suggested you installed a 1K resistor to ground on the TPS signal wire, so you keep the TPS signal locked at 0%.

Jordan

Yea I know it's not the best soldering, I'm using a cheap iron, thick solder and I'm not the best at it but I did clean it up a bit. Il check all the transistors again tonight. I've posted my msq and datalog in my first post but Il get a composite log and a new datalog after work today.

retrothis

Ah, cool! Learned something today!