Megasquirt T2 coil won't fire
#1
T2 coil won't fire
ok, my tach in only showing 1/2 the true RPM and the t1 is firing correctly (confirmed with timing light) and T2 will not fire at all. We've tried several different coils and its the same result. It also will not even fire the T1 under 800 rpm. Any ideas?
Last edited by philiptompkins; 01-11-08 at 10:27 PM.
#2
SAE Junkie
iTrader: (2)
Its not meant to fire the trailing coil below 800rpm. It is disabled in software because there is a bug that would cause a miss as the rpm crosses through 800rpm.
Try setting up the coil on a bench and see if the toggle works.
Pink is Fire
White is toggle
Earth the metal plate on the T coil
Try setting up the coil on a bench and see if the toggle works.
Pink is Fire
White is toggle
Earth the metal plate on the T coil
#3
ok, well I think we figured some of it out.... some of it had to do with the Dwell settings. I found on here that toufuball (i think) had
5
2.6
.5
for the dwell settings, I had a 5 instead of the .5.
But now the tach (and I assume the T coil) jumps around quite a bit, sometimes it will show 1/2 actual RPM. Like if I'm ideling at 1200, the tach will show 600.
Any more ideas? and are my dewll setting correct? And are there and other settings that would affect this?
-Thanks
5
2.6
.5
for the dwell settings, I had a 5 instead of the .5.
But now the tach (and I assume the T coil) jumps around quite a bit, sometimes it will show 1/2 actual RPM. Like if I'm ideling at 1200, the tach will show 600.
Any more ideas? and are my dewll setting correct? And are there and other settings that would affect this?
-Thanks
#4
Red Neck Tony Stark - C2
iTrader: (1)
Its not meant to fire the trailing coil below 800rpm. It is disabled in software because there is a bug that would cause a miss as the rpm crosses through 800rpm.
Try setting up the coil on a bench and see if the toggle works.
Pink is Fire
White is toggle
Earth the metal plate on the T coil
Try setting up the coil on a bench and see if the toggle works.
Pink is Fire
White is toggle
Earth the metal plate on the T coil
#6
SAE Junkie
iTrader: (2)
I just used the car battery. So 12V works and it didn't seem to damage my coilpack.
I'm pretty sure the megasquirt toggles between 0V and 5V.
For eg.
Join the two tan wires to the battery.
Use a wire with lugs on the end as an earth strap to the battery/chassi YOU NEED TO EARTH THE BODY OF THE COILPACK!
leave the white wire hanging
touch and release the connection fromt he red wire to teh battery and one of the coils should discharge.
next join the white wire to the battery.
touch and release the red wires connection from the battery and the other coil should discharge.
I'm pretty sure the megasquirt toggles between 0V and 5V.
For eg.
Join the two tan wires to the battery.
Use a wire with lugs on the end as an earth strap to the battery/chassi YOU NEED TO EARTH THE BODY OF THE COILPACK!
leave the white wire hanging
touch and release the connection fromt he red wire to teh battery and one of the coils should discharge.
next join the white wire to the battery.
touch and release the red wires connection from the battery and the other coil should discharge.
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#10
Also I did some more investigation with the timing light, so here is some more insighgt:
Ok, I locked down the advance to 0 and the split to 0.
Both the Leading coils were firing at 0 but the T1 was roughly 20deg advanced, shouldent it be at 0 also? shouldent the T1 and L coils be firing at the same time if there is no split?
Also, how far apart should the T2 be firing from the T1? like, if I had a digital timing light I could check that too.
About the T2 Coil: When I hooked the timing light to the T2 coil I saw that is was not firing below about 1500 RPM, this explains the weird tach behavoir. So what would cause the T2 coil to not fire below about 1500 rpm and the T1 to contine firing all the way down to 800?
#11
MegaSquirt Mod
Nothing in code would cause the problems you're seeing. Most likely you have something wiring related inside the MS or between the MS and the ignitors messed up. You have pullups on all the LEDs, have the middle LED wired to coil select, and have the right-most LED (looking at the front of the box) wired to the IGt-T signal? You don't have spark output inverted do you?
Ken
Ken
#12
Nothing in code would cause the problems you're seeing. Most likely you have something wiring related inside the MS or between the MS and the ignitors messed up. You have pullups on all the LEDs, have the middle LED wired to coil select, and have the right-most LED (looking at the front of the box) wired to the IGt-T signal? You don't have spark output inverted do you?
Ken
Ken
I'll be checking the board wiring as well
hmm..........
#14
MegaSquirt Mod
as long as there's metal to metal contact bolting the coils to the ignitor, and the ignitor to the chassis, then grounding shouldn't be the issue...
Did you verify that you're not running inverted spark outputs in MegaTune?
Ken
Did you verify that you're not running inverted spark outputs in MegaTune?
Ken
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