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Old 05-25-2007, 10:07 PM   #1
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Default Tried to start for first time = no go

Ok, so i finished installing my megasquirt today and attempted to start it up.. All it did was crank and crak.. i noticed a few things..

The reading in megatune was pegged at 28 while it was just sitting there and while i was cranking, however, when i slowly pressed the gas pedal it went down to 17.something..

One more thing, my kpa reading was like 87 or someting really high, and when i pushed the pedal all the way down it went to 97 or whatever, but shouldnt it be reading like 20kpa or something?
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Old 05-25-2007, 10:20 PM   #2
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do you have any spark? which directions did you follow....

to test for spark, take off plug #1, stick a wire in it and put the other end about an inch next to anywhere it can ground to. try to crank it and watch for spark...
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Old 05-25-2007, 10:23 PM   #3
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Quote:
Originally Posted by Braineack View Post
do you have any spark? which directions did you follow....

to test for spark, take off plug #1, stick a wire in it and put the other end about an inch next to anywhere it can ground to. try to crank it and watch for spark...
Ill go check that now.. I bought the megasquirt from fulltilt, i watched him put it in his miata and start it so i know its a working unit.
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Old 05-25-2007, 10:30 PM   #4
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Is there a year difference between the cars or are they exactly the same. There could be some differences between the harnesses if so.
Is it wired with a patch harness or did you tap the lines another way?
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Old 05-25-2007, 10:38 PM   #5
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Originally Posted by cjernigan View Post
Is there a year difference between the cars or are they exactly the same. There could be some differences between the harnesses if so.
Is it wired with a patch harness or did you tap the lines another way?
I just spiced the lines from the ecu to the MS connector

The miatae are the same years
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Old 05-25-2007, 10:41 PM   #6
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your coil wiring could be backwards. I had to swap mine to get the car to fire.
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Old 05-25-2007, 10:45 PM   #7
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Quote:
Originally Posted by cjernigan View Post
your coil wiring could be backwards. I had to swap mine to get the car to fire.
I could try it.. i used the wiring directions here:

https://www.miataturbo.net/forums/sh...wiring+diagram

do you know if thats right or not?
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Old 05-25-2007, 10:51 PM   #8
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I have a question.. i dont know if this has anything to do with this or not.. but can anyone tell me if this little connector is stock or not? When i bought the car it had some kind of aftermarket alarm system..

The car was running fine before i squirted it but still just wanted to know if it was stock
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Old 05-25-2007, 10:55 PM   #9
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heres another pic of it
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Old 05-25-2007, 10:55 PM   #10
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Well those wiring directions are for a '90 model not a 94 or whatever you have so no they're not correct for your use.
Is that MS wired for the DIYautotune mods or Kags mods?
You can get the appropriate wiring harness color coding from http://www.madracki.com/miata/wiring.html if you haven't already.
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Old 05-25-2007, 10:59 PM   #11
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Oh im sorry i didnt even say anything about it.. its a '90

And im not sure whos he used ill find out tho
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Old 05-25-2007, 11:10 PM   #12
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Ok just tested for spark (pulled a wire boot off one of the plugs, stuck a wire in there, and put it near a ground while cranking)
No spark
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Old 05-25-2007, 11:39 PM   #13
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Switched the brown and brown/yellow spark wires and still no spark
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Old 05-26-2007, 01:57 AM   #14
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Are you getting an RPM reading in MT while cranking? If not, start with that. With no RPM, MS will not trigger the coils.

Can you go back to letting the stock ECU control spark and MS control fuel? At least then you can verify the fuel side of the system.
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Old 05-26-2007, 08:46 AM   #15
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turn the spark to stock ecu and try fuel, if this works it might be your baord mods that are weired. Chad his ecu is in the footwell that means 1.6 not 1.8 94. All of the years should be the same.
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Old 05-26-2007, 12:14 PM   #16
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Yeah i'm getting rpm reading on megatune, and ok ill try to run spark off the stock ecu and see what happens
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Old 05-26-2007, 12:26 PM   #17
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open it up and take a pic of both sides of the board...
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Old 05-26-2007, 12:46 PM   #18
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Quote:
Originally Posted by Braineack View Post
open it up and take a pic of both sides of the board...

ill do that after i try to start it with stock ecu controlling spark
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Old 05-26-2007, 01:11 PM   #19
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Ok.. wired it back up to stock spark, started right up first try..

Took some pics of the megasquirt, sorry if the pics are a lil crappy
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Tried to start for first time = no go-img_1812.jpg   Tried to start for first time = no go-img_1813.jpg   Tried to start for first time = no go-img_1815.jpg   Tried to start for first time = no go-img_1816.jpg  
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Old 05-26-2007, 03:30 PM   #20
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when you try it with the MS, do you get spark at all? does it try to crank but it just doesnt catch? does it combust? does it pop/backfire?
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