MSefi.com read only forum (Jan.15,2018)

You will need to set the ECU type through MegaTune after loading the code; this is not part of what the Downloader does.


After upgrading to the latest MS-II software (2.8900) and replacing my Q16 module (and setting the ECU, whoops) she's running again!!!

oh it was so nice to hear it run. I ...

Did you set the ECU type when you loaded the code? If you do not set it, you'll get the result described. This was put in there because both the MS2 and Microsquirt use the same code.


I used MS Download 2.00. I selected the code, clicked install. It did the rest automatically. I did see there ...

You might want to try upgrading to the latest firmware and see if that helps.

Well, that broke lots of things.

I upgraded to ms2_2.888a and the first thing I noticed is my fuel pump primed continuously. I unhooked the MS unit from the car and put it on the stim.

The stim shows IG solid red, I2 ...

Small update-

I got infront of the stim again to see if the IG light on the stim flashes or not.

The IG light on the stim does flash but goes solid above ~350 rpm.

Not sure if this changes things at all.I doubt it would but I wanted to be sure to state it.

The gauge shows what the MS "thinks" it's doing, but the Stim shows what it really is doing. The LED turns on when the spark output is grounded, but if it's grounded full time the MSD won't fire.

And yes, we sell replacement parts in the MS Service Parts section of our website.



Ahhhh.. Makes ...

The IG LED should not stay on constantly - it should pulse on and off. Sounds like a problem with Q16.


Hrmm.. I'll double check. But I did see the dwell gauge move as if it was normal in Megatune when hooked up to the stim. The log shows it moving (flat lines because I was playing with maxing it ...

I'd check it on a Stim first, see if the IG LED blinks on and off. Also take off the cover and check the markings on the transistor there.

My stim arrived today (thanks again DIYAutoTune).

Dwell looks perfectly fine on the stim. The IG LED stays on constantly. I took a quick data log (I dunno if ...

I'd check it on a Stim first, see if the IG LED blinks on and off. Also take off the cover and check the markings on the transistor there.

Alright, thanks Matt.

My stim hasn't arrived yet so I'll put this on hold until it does. I was *really* hoping it was wiring/dizzy/msd as all those are ...

Matt Cramer wrote:Ah, sounds like the coil driver output may be damaged. What do you have in the Q16 slot?

I have no clue. I bought this pre-built and had Peter Florance mod it for me to work on a mustang. How shall I test for this Matt?

How exactly is your MS wired up? Is the MS wired to control spark through the TFI module, or wired directly to the MSD box? Sounds like a problem with the

MSD boxes do not have dwell in the usual sense, and the TFI module if being used will expect a square wave with a 50% duty cycle. I'd also be ...

So one thing I have noticed when comparing my datalogs to that of other running mustangs with MS.

My dwell is flat. When it does move (drop) that is when the engine will fire. I researched what dwell is (again I'm a complete EFI dumbass):

Dwell angle is a measure of the duration of time that the ...

Well I guess I need to find out if the problem is with my MS unit or my wiring.

I went ahead and ordered a MegaSquirt Stimulator from DIYAutoTune. We'll see what that has to say/show.

I went through all of my ignition wiring, everything is nicely soldered together still.

So I went down to the parts store and replaced the TFI module. Sadly no change..

Next on my list is to swap out the MSD box... see if that is the issue.


I tested my MSD box via this method: http://www ...

I went through all of my ignition wiring, everything is nicely soldered together still.

So I went down to the parts store and replaced the TFI module. Sadly no change..

Next on my list is to swap out the MSD box... see if that is the issue.

Lance/Matt, thank you both very much for your input and suggestions.

Lance- I've checked all the fuses and tried to go over much of the wiring to confirm nothing is out of order. So far everything looks good.


I snagged the laptop and went and sat in the mustang for another 10 minutes or so today ...

Standard info:
MS-II V3 board
Ford 5.0 engine
I made the engine wiring harness
MSD 6A with a 94/95 external TFI ignition
GM IAT & temp sensor
Current running configuration:
http://performanceclassifieds.net/megasquirt200812291715.msq


This was a perfectly working MS setup. Engine ran fine for the ...