Megasquirt Car Starting Problems
09-10-2010, 02:34 PM
#21
Well I pulled the coils, plugs and unplugged the injectors and turned the car over.
You should have SEEN the amount of fuel that came shooting out of cyl 2 and 3. It covered my engine bay in fuel and half my driveway.
I'm letting it air out overnight. And will pick up new plugs tommorow.
I checked all the connections on the patch harness and they are all fine. No touching of one to another from twisting it.
So the only logical conclusion is a problem with the MS or two of the 4 of my coils happened to **** the bed at exactly the same time I did the re-location of the MS. I am trying to locate a local Stim and if I can't find one I'll head down to Bellingham and throw it on wayne_currs. Since 2 and 3 fire together (I think?) I'm guessing my spark output is messed up somehow.
You should have SEEN the amount of fuel that came shooting out of cyl 2 and 3. It covered my engine bay in fuel and half my driveway.
I'm letting it air out overnight. And will pick up new plugs tommorow.
I checked all the connections on the patch harness and they are all fine. No touching of one to another from twisting it.
So the only logical conclusion is a problem with the MS or two of the 4 of my coils happened to **** the bed at exactly the same time I did the re-location of the MS. I am trying to locate a local Stim and if I can't find one I'll head down to Bellingham and throw it on wayne_currs. Since 2 and 3 fire together (I think?) I'm guessing my spark output is messed up somehow.
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09-10-2010, 05:27 PM
#23
Ok update. I let the car sit overnight and let the fuel evap. I put new plugs in and swapped a few coils around to see if they were the issue. I was wrong before. It's not cyl 2/3 it's cyl 1/3. I check the plugs after it had a hissy fit again. So it's running on cyls 2 and 4. I just pulled the MS out of the car... and am opening it up. Maybe I'll see something fried? Dunno...
I've ruled out that it's the coils... or the wiring (tested with a multimeter).
And Anton... it's not the TPS. It's well wrapped up and zip tied out of the way.
I've ruled out that it's the coils... or the wiring (tested with a multimeter).
And Anton... it's not the TPS. It's well wrapped up and zip tied out of the way.
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09-10-2010, 06:12 PM
#24
Ok well its definitely related to spark and not fuel then. I guess its possible that something happened inside the megasquirt though I'm not so sure you'll be able to tell anything at all. I think I'm just going to have to take a look at it in person.
In the mean time, reflash the firmware, burn your MSQ again and see if that does anything. I've had my firmware corrupt for some reason after moving the megasquirt around, unplugging it and plugging it back in, etc. Never caused 2 cylinders, but who knows. Gotta try the simple stuff first.
In the mean time, reflash the firmware, burn your MSQ again and see if that does anything. I've had my firmware corrupt for some reason after moving the megasquirt around, unplugging it and plugging it back in, etc. Never caused 2 cylinders, but who knows. Gotta try the simple stuff first.
Last edited by curly; 09-11-2010 at 01:12 PM.
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09-11-2010, 02:30 AM
#32
Anyway, forget the stim. It wont solve anything. What we need to do is plug it into my car and make sure its working or broken. Thats the first troubleshooting step then we can go from there.
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09-11-2010, 02:10 PM
#37
I think I figured it out. A while ago Joe Perez posted the thread on dwell. He found 3ms worked better for him and that it is in fact actually 2.5ms because of a wierd calculation in the code. So what did I do? Changed my dwell to 3.0ms. And now this. And I found this thread to confirm my conclusion. Time to order a new Bosch ignition driver and set my dwell back to 2.5ms where it's been sitting happily for the last 8 mos.
http://www.msextra.com/forums/viewto...=36329&start=0
http://www.msextra.com/forums/viewto...=36329&start=0
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09-11-2010, 03:05 PM
#40
That TIP120 you're focusing on has nothing to do with your ignition drivers. That is your idle control circuit. I totally understand why you're confusing it though because on a standard build for most people that spot is used as an ignition driver.
The transistors I think you're looking for are in the proto area. Go find Joe's thread on the spark output mod and you can read all about them and how to build the circuit.
The transistors I think you're looking for are in the proto area. Go find Joe's thread on the spark output mod and you can read all about them and how to build the circuit.
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