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if your megasquirt only ran on 2 cylinders, what would you check?

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if your megasquirt only ran on 2 cylinders, what would you check?

Old 05-13-2011, 09:40 AM
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the mods look done correctly.

one the harness, make sure the brown and white/green wire labeled ignitor goes back to these spots:





If they do, make sure the white/green wire that's labled pin 31, acutally goes back to pin 31 on the db37 side of the harness. If it doesn't, check to see if pin 31 is acutally going to position 1V on the harness connector labled Clutch.
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Old 05-13-2011, 06:13 PM
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okay. i've never really dealt with wiring diagrams and pinouts but....

as far as i can tell, the white/green wire in 1G on the car side of the harness goes to pin 26 on the MS side. the brown wire in 1H goes to pin 21. the green/white wire labeled clutch in 1V goes to pin 28.


this is from my dumb *** looking at the picture you posted here, and this pic in your MS tutorial

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Old 05-16-2011, 06:22 PM
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anyone else have any ideas?
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Old 05-16-2011, 06:56 PM
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ok, so to make this simple ill list the wires from pin 20 to 37

your post above has a few of them mixed up, see bold items


20- 2P
21- 2Q
22- 2L
23- WB/2N
24- 2E
25- 2G
26- 1N
27- 1R
28- 1B
29- 1V
30- 2w
31- 1G
32/33- 2v
34/35- 2U
36- 1w
37- fuel pump
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Old 05-16-2011, 07:53 PM
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left to right:

brown, green to 2 pins, blue 2 pins, white/green, green, green/white, red, black, grey, white/blue, white, pink, blue, yellow, orange

the other row of pins are all black, grounds i assume
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Old 05-16-2011, 11:46 PM
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unless you brought the 2nd ign trigger out on a different wire you have it wrong, should be black, brown, big green, big blue, green/white, green, white/green, red, white/blue, gray, blue/white, white, pink, blue, yellow, orange


this is assuming your using the default colors as well
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Old 05-17-2011, 09:31 AM
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you cant go by the color. you have to follow them back to the pin on the yellow connector.
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Old 05-18-2011, 11:18 PM
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Originally Posted by Braineack View Post
you cant go by the color. you have to follow them back to the pin on the yellow connector.
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Old 05-20-2011, 06:35 PM
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looking at this pic, my harness seems backwards.



is my harness good or no?
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Old 05-20-2011, 06:37 PM
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Fine if you are looking at the connector from the wire (harness) side, not from the plug side.
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Originally Posted by ninerwfo View Post
The “into to megasquirt thread” mentions that the MS3 basic has 5 inputs with built in pull up resistors - and I was just wondering why it would have so many, while the MS3Pro PnP has just 2 (with no pull ups?)
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Old 05-20-2011, 06:42 PM
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Originally Posted by Reverant View Post
Fine if you are looking at the connector from the wire (harness) side, not from the plug side.


so my harness is correct?
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Old 05-20-2011, 06:43 PM
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im assuming the black unlabeled wire goes to 1P?

everything related to spark looks correct from here.
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Old 05-20-2011, 06:50 PM
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Originally Posted by Braineack View Post
im assuming the black unlabeled wire goes to 1P?

everything related to spark looks correct from here.
1p is not used. all the black wires go to 2a-d
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Old 05-20-2011, 07:41 PM
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(zack morris's phone)

the blacks between 1b red and 1n gray does as well? Not that it should matter for spark. Which set of plugs did you say wouldn't fire?
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Old 05-20-2011, 08:46 PM
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Originally Posted by Braineack View Post
(zack morris's phone)

the blacks between 1b red and 1n gray does as well? Not that it should matter for spark. Which set of plugs did you say wouldn't fire?
I haven't traced the wire, but the only black on the car side are six i believe in 2a–d, and one that connects two pins on the yellow harness.


No spark on two and three
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Old 05-23-2011, 11:13 PM
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Originally Posted by DrewLGT View Post
I haven't traced the wire, but the only black on the car side are six i believe in 2a–d, and one that connects two pins on the yellow harness.


No spark on two and three
.
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