typicall newb ms2 only one coil is firing help please - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-24-2011, 08:41 PM   #1
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Default typicall newb ms2 only one coil is firing help please

ok so im trying to get this car started

01 motor stock coils
650cc injectors
ms2 pcb3.0
97 cam angle sensor for the megasquirt
ive build the "improved spark outputs"
gm iat
latest code msextra 3.1.1



things worth noting

*both d16 and d14 are always on...i think its supposed to be like that
*car only cranks at about 130-150rpm (i was expecting like 300 cuz thats what everyone else seems to have their cranking rpm at
*i put a timing light up to it and i was happy i was getting spark but it seems like its only on 1 coil.
*its running in paralell with the stock ecu. ive left the oe ecu to deal with the tach, iac, and fuel pump for now untill i get my feet wet.
*as far as a solid tach signal from the cas...its kind of iffy. when i watch the gauges the little boxes at the bottom that say ready, synched, and cranking blink red and green repeatedly while i crank the car. not sure if its supposed to say synched and just stay synched or does it just become disoriented once the engine stops spinning.
*another thing ive also been trying to teach it where TDC is by setting "timing advance" to fixed and playing with the trigger offset but it seems like no matter what value i enter the coil that is firing does not fire at a different time. right now it seems like it thinks 10*btdc is in the 340* range. (way too far to the left if youre staring at the crankshaft from the front of the car)
*both coils are getting 12v and ground
*both coils seem to be in good working condition havent fried them yet. verified by switching the connectors.


*iat is calibrated
*tps is calibrated
*clt is calibrated

idk do you guys need any more info? please help ive had this car down for like 7 months i miss driving it so much. need some pointers on where to start checking for problems
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Last edited by samwu8k; 10-24-2011 at 10:28 PM.
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Old 10-24-2011, 10:31 PM   #2
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just realized when i re installed the motor i diddnt hook up the puny factory braided wire engine ground cable. i got a 4gauge wire im going to put some terminals on and mount to the engine/chassis tomorrow morning. not sure if that will even help but i read on here about how important grounds are.

really getting bummed after hearing all the cool intake backfire noises :(
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Old 10-25-2011, 08:27 AM   #3
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your coils are wired in pairs...it wouldnt be possible for only 1 to fire.

figure out which pair works, and examine the spark output the controls the non-running pair.
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Old 10-25-2011, 12:38 PM   #4
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Quote:
Originally Posted by Braineack View Post
your coils are wired in pairs...it wouldnt be possible for only 1 to fire.

figure out which pair works, and examine the spark output the controls the non-running pair.
theres only 2 coils. they are not wired in pairs.

double checked the wiring this morning checked for continuity from inside the cabin to out by the connector all is looking good. the megasquirt wiring inside the box looks good as well. i have no idea where to even start poking around anymore. ive added my beefy engine/chassis ground this morning.

HOW IMPORTANT IS IT TO USE SHIELDED WIRE ON THE TACH SIGNAL??? perhaps thats why im getting such low cranking speeds because i couldnt find any sheilded wire to use.

sometimes after cranking the car the rpm just stays at 1 then i have to powercycle it to make it go away.

got a new battery and a battery charger so i can crank this **** as much as necessary to figure out these bugs.
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Old 10-25-2011, 12:41 PM   #5
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Quote:
Originally Posted by samwu8k View Post
theres only 2 coils. they are not wired in pairs.
So you have a 2 clyinder motor? sorry, but I assumed you were suggesting only 1 clyinder was reading the pulse.

Quote:
HOW IMPORTANT IS IT TO USE SHIELDED WIRE ON THE TACH SIGNAL??? perhaps thats why im getting such low cranking speeds because i couldnt find any sheilded wire to use.
not at all.

Quote:
sometimes after cranking the car the rpm just stays at 1 then i have to powercycle it to make it go away.
Why are you running 60 for the trigger angle? I'd drop that to 0.
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Old 10-25-2011, 12:45 PM   #6
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http://miataturbo.wikidot.com/ms2-a

taken from here

"Input/Output Mods
The bottom picture is the better spark output created by Joe P on miataturbo.net. Just follow the mods in both picture, and your done. You must use two 2N2222 transistors for the spark output. The resistors needed in the spark output are 100-300 ohms. Use the spare 270 ohm resistors from R30-36. Also, JS0 to JS4 will not work at input/outputs unless you jump s12c to JS9. So jump s12c to JS9."

i noticed i didddnt jump s12c to js9 but i diddnt think it was necessary since i dont think im using those ports. or am i?
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Old 10-25-2011, 12:53 PM   #7
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I'm aware of that, I wrote it.

And I dunno, are you? (But that's not the issue).


Sounds like one of the spark circuits simply isn't working right. Do you have a stim?
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Old 10-25-2011, 01:00 PM   #8
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Quote:
Originally Posted by Braineack View Post
I'm aware of that, I wrote it.

And I dunno, are you? (But that's not the issue).


Sounds like one of the spark circuits simply isn't working right. Do you have a stim?

if those ports have nothing to do with sending a signal to the coils then no im not using it.

i dont have the big stim with all the bells and whistles that seems to solve everyones problems i have the crappy little one (megastim v2.21)... can i still use it? honetsly i dont even know why i havent tried playing with it on the stim i feel like this one is a POS that is unable to simulate the signals from the miata cas.

should i just put this **** on hold and buy one of those baller *** jim stims?
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Old 10-25-2011, 01:44 PM   #9
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well it would just make it easier to to test the triggers. you can check them to 5v while on the stim.

can you post a pic of your D14 and D16 mods?
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Old 10-25-2011, 02:34 PM   #10
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Quote:
Originally Posted by Braineack View Post
well it would just make it easier to to test the triggers. you can check them to 5v while on the stim.

can you post a pic of your D14 and D16 mods?
ill have pics up tonight
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Old 10-25-2011, 05:14 PM   #11
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If you didn't have s12c hooked to JS9, it won't work.

I just got mine running earlier this week after struggling for a month of only one coil firing because of this issue.
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Old 10-25-2011, 05:30 PM   #12
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TROLOLOL I JUST READ YOUR THREAD^^^!!1 doood i cant wait to go home and try this
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Old 10-25-2011, 07:55 PM   #13
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ok its acting super funny now. both coils are firing but intermittently. ive been cranking the car a bit already and battery voltage dropped down to about 10.5ish volts gotta charge it up idk maybe the coils dont have enough dwell time at such a low voltage.

ive set the dwell at like 3.5 at cranking...im afraid to turn it up

the good part is when it was cranking it managed to acheive about 10degrees btdc by setting the offset to 60 and playing with the cas angle.

idk i feel like its not getting enough fuel now. or maybe its too much. i pulled out a plug and it was damp. idk it wasnt soaked tho so idk if that would prevent it from firing. also it still seems like its not firing the coils often enough. like its supposed to be sparking way more often during cranking....idk thats just what it seems like to me.

the car is pooting and kicking
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Old 10-26-2011, 10:04 AM   #14
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any ideas guize? im about to go hop in the garage and start playing with things.

i feel like it might not be getting enough fuel during cranking so i set my injectors to 500cc instead of the 650 that they were flowed tested at. idk what to expect.

its firing the coils steadily with a charged battery but it fires once and i can see its at 10* but then the next time it fires is a whole second later and 10*btdc is no where to be found untill the next round i see it at 10* again. i understand why im seeing this because the car is using a wasted spark ignition but then again....i still feel like its firing the plugs half as often as it should.

im about to go see how often the plugs are fired during cranking on my mitsubishi 2400cc.

what kind of rpm am i supposed to be seeing during cranking. my **** jumps around from 160-130 sometimes when i throw in the fully charged battery it jumps to like 200ish for a split second.
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Old 10-26-2011, 10:27 AM   #15
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ok coil for cylinder 1 and 4 is not firing anymore this **** is so frustrating.
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Old 10-26-2011, 10:55 AM   #16
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it's your circuitry, check for cold joints, bad connections, etc.







I'd still bring my trigger angle down to 0 and go from there.
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Old 10-26-2011, 03:03 PM   #17
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typicall newb ms2 only one coil is firing help please-dscn0724.jpg   typicall newb ms2 only one coil is firing help please-dscn0711.jpg   typicall newb ms2 only one coil is firing help please-dscn0719.jpg   typicall newb ms2 only one coil is firing help please-dscn0712.jpg   typicall newb ms2 only one coil is firing help please-dscn0710.jpg  

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Old 10-26-2011, 03:03 PM   #18
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Old 10-26-2011, 03:04 PM   #19
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ill probe the circuits ive built tonight to make sure everythign has continuity
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Old 10-26-2011, 03:12 PM   #20
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you're not getting the cam input.

what's the ground going to JS11 for?

why are you using the MSPNP basemap for a DIYPNP?
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