Burnt ignitor (how can i prevent from burning another one)
#1
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
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
#2
What are your dwell settings?
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#4
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
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
#11
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?
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?
#13
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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.
#14
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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Peter - DIYAutoTune Tech Support
DIYAutoTune.com
We manufacture the most affordable high end engine management available anywhere, and we do it right here in the USA!
MegaSquirtPNP Gen2- 1 hour install Plug-N-Play for Miata's
-
MegaSquirt-3 Pro EMS - Top of the line ECU at an affordable price.
Peter - DIYAutoTune Tech Support
DIYAutoTune.com
We manufacture the most affordable high end engine management available anywhere, and we do it right here in the USA!
MegaSquirtPNP Gen2- 1 hour install Plug-N-Play for Miata's
-
MegaSquirt-3 Pro EMS - Top of the line ECU at an affordable price.
#19
Glad you got this all fixed.
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Peter - DIYAutoTune Tech Support
DIYAutoTune.com
We manufacture the most affordable high end engine management available anywhere, and we do it right here in the USA!
MegaSquirtPNP Gen2- 1 hour install Plug-N-Play for Miata's
-
MegaSquirt-3 Pro EMS - Top of the line ECU at an affordable price.
Peter - DIYAutoTune Tech Support
DIYAutoTune.com
We manufacture the most affordable high end engine management available anywhere, and we do it right here in the USA!
MegaSquirtPNP Gen2- 1 hour install Plug-N-Play for Miata's
-
MegaSquirt-3 Pro EMS - Top of the line ECU at an affordable price.
#20
Thank you for this!
Sorry for the old thread bump. New to Miatas and Megasquirt.
Picked up a ‘90 NA with a ‘99 1.8 swap running a Megasquirt Plug N Play 3, but retained all the OE 1.6 ignition components, and the car has fried 4 igniters in basically 2 months of driving.
Initially I thought it was my lack of thermal paste(didn’t know it was supposed to have any, new units did not include) combined with the mounting plate being Swiss cheesed by the previous owner(less thermal mass), but the last 2 I fried, the car basically didn’t even leave the garage. Still going to replace that plate with stock and maybe add a heat sink, as well as thermal paste.
Hoping that dialing my ignition settings in TunerStudio will curb this problem once and for all!
Since I’m really not sure how this ignition system is setup, would it be safe enough to just change the “Inverted” option to whichever one isn’t currently chosen? Or should I really try to dig into things to figure out whether I want inverted or not?
Appreciate the knowledge !
Picked up a ‘90 NA with a ‘99 1.8 swap running a Megasquirt Plug N Play 3, but retained all the OE 1.6 ignition components, and the car has fried 4 igniters in basically 2 months of driving.
Initially I thought it was my lack of thermal paste(didn’t know it was supposed to have any, new units did not include) combined with the mounting plate being Swiss cheesed by the previous owner(less thermal mass), but the last 2 I fried, the car basically didn’t even leave the garage. Still going to replace that plate with stock and maybe add a heat sink, as well as thermal paste.
Hoping that dialing my ignition settings in TunerStudio will curb this problem once and for all!
Since I’m really not sure how this ignition system is setup, would it be safe enough to just change the “Inverted” option to whichever one isn’t currently chosen? Or should I really try to dig into things to figure out whether I want inverted or not?
Appreciate the knowledge !
Last edited by GotAMiata; 07-15-2023 at 04:22 PM.
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