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Old 02-12-2013, 02:42 PM   #1
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Default Burnt ignitor (how can i prevent from burning another one)

So i think i have have found out why it was impossible to get a good idle on my MS 1 1990 Miata with just 70k miles and there was no tachometer reading

i think i burnt up my ignitor (Ignition control module) i was trying to get my idle right and i was trying everything VE table adjustment ignition adjustments idle set screw ect.but i could not get it to idle smooth without anydropping in Revs

i felt my ignitor and it was extremely hot so i began to runs some test i discovered using this forum and others

The diagnostics port B+ to ig- with a 1k ohm 1/4 watt resistor this did help for a few moments (i think) as there was no drop in revs for about 45 seconds but then it dropped and started acting weird .

I then read on the internet that you can try and fault find an ignition control unit by cooling it down and see if it resolves any issues .it worked and the car idled like a champ.

so with all this evidence does this mean that the ignitor is Broken?

In my tune/install of MS what could have caused this ignitor to burn common reasons for ignitors to brake?

Will the new ignitor be likely to fix my tachometer and make it work again?

First post so sorry if its a nooby questions

Thanks will
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Old 02-13-2013, 12:06 PM   #2
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What are your dwell settings?
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Old 02-13-2013, 12:29 PM   #3
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what MS is this? a DIY MS1? who built it?

and MS1?

what basemap are you using?

is it setup correct for your ignition output mods?
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Old 02-13-2013, 10:32 PM   #4
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My Dwell is Crank = 8.0
Running = 5.0
min discharge period 0.5

its a mega-squirt 1 v3.0 built by me using the information kindly posted in this forum and it is a parallel install

I could not find a base map(many of the links i found were broken so i used the settings i found posted around the forums from people that had the same setup as me (1990 AIT sensor stock injectors)

i did the ignition mod posted in the "how to make your own mega squirt" and i selected ignition output inverted "YES" Which i believe is right
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Old 02-14-2013, 12:02 PM   #5
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How *exactly* did you set up your spark outputs?
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Old 02-14-2013, 12:13 PM   #6
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yeah, knowing how the physical spark output mods are setup makes a difference in whether to select inverted or not. if not corect, it can/will burn up an ignitor.
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Old 02-14-2013, 01:31 PM   #7
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hope this is what your after when you say spark out puts

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Old 02-14-2013, 01:49 PM   #8
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physical. like the actual components on the mainboard.
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Old 02-14-2013, 02:17 PM   #9
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oh it is done exactly the same as in your thread with how to make and install your own mega squirt

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Old 02-14-2013, 02:18 PM   #10
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if you did the mods like that, then the spart output should NOT be inverted. Change YES to NO and you will no longer burn up ignitors.
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Old 02-14-2013, 02:51 PM   #11
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ok the master has spoken thank you i must have miss read i always thought it was a "yes"

i am in the car right now and the ignitor is no longer hot and the car is idling well. however the tach still does not work in your educated opion do you think my new ignitor will allow the tach to work again?
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Old 02-14-2013, 02:52 PM   #12
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correct, that part has burnt out. a new ignitor will fix it.


a 1K resistor from IG- to B+ in the diagnostics box might also as well.
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Old 02-14-2013, 03:05 PM   #13
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Quote:
Originally Posted by willerdcraft View Post
ok the master has spoken thank you i must have miss read i always thought it was a "yes"
It's a weirdly named setting, in that no means yes. (Kind of like what I tried explaining to the judge...)


When you set that switch to "No", the actual output pins of the CPU itself are in fact inverted, in that they go high to turn the spark output off. This is because the "typical" output circuit is, itself, inverting. (Which is why ignitors also fry when you re-flash the code; the CPU is off line, so it can't turn the outputs off.)

The JoeSpark mod corrects this situation by un-inverting the output drivers, so that they follow the actual state of the CPU. This eliminates the pop on startup that people with leaky injectors get, as well as making the re-flash procedure safe by causing the outputs to naturally want to be off. If you build this circuit, THEN you will want to select "Yes" for inverted, which in reality means that "No, my outputs are NOT inverted," for reasons known only to the original designers in what must have been a hilarious whiskey-fueled coding session surrounded by a haze of crack vapor.



On topic: If your ignitor is still functioning sufficiently well to drive the coils, and you don't want to buy a new one, you could build a Tach Out circuit in the MS to drive the tachometer directly.
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Old 02-14-2013, 03:06 PM   #14
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Im Glad you got this all figured out. Remember, measure twice, cut once. Even then, go over it another couple of times to make doubly sure.
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Old 02-15-2013, 10:09 AM   #15
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thanks for the help every one i have ordered a new ignitor not to bad price either $30 on ebay.

Last edited by willerdcraft; 02-15-2013 at 01:33 PM.
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Old 02-15-2013, 10:19 AM   #16
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you DID NOT DO the JoeSparkMod
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Old 02-15-2013, 10:59 AM   #17
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Quote:
Originally Posted by willerdcraft View Post
thanks for the help every one i have ordered a new ignitor not to bad price either $30 on ebay.

for any one else out there who does Joespark mod rember just select "NO"
Incorrect. The "joespark" mod would necessitate selecting "YES".

You did not perform the Joespark mod, so the correct setting for you is "NO".
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Old 02-17-2013, 05:14 PM   #18
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installed the new ignitor and everything works well and tachometer is back online
Thanks alot for the help guys
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Old 02-18-2013, 10:42 AM   #19
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Glad you got this all fixed.
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