Problems with Chrysler 2.2/2.5 mode

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Problems with Chrysler 2.2/2.5 mode

Postby UnaClocker » Sun Mar 04, 2012 3:33 pm

When using the Chrysler 2.2/2.5 mode in wasted spark mode, I found that Coil A actually has to be hooked to Cyl 2/4 rather than 1/3. This tells me it's interpreting the trigger wheel 360 degrees off. Am I correct in that assumption?
If this is the case, would it also be firing the wrong injectors, when in full sequential mode?
The firing order is 1/3/4/2, I have A going to 1, B to 3, C to 4, and D to 2. What would be the correct order if it's off by 360 degrees? A to 4, B to 2, C to 1, and D to 3?
Last edited by UnaClocker on Fri May 18, 2012 7:57 pm, edited 1 time in total.
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Re: Making sure correct injectors are firing

Postby billr » Sun Mar 04, 2012 4:09 pm

What am I missing? If that is an even-fire I4, then I think one coil should be for 1 & 4, the other for 3 & 2.
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Re: Making sure correct injectors are firing

Postby UnaClocker » Sun Mar 04, 2012 5:08 pm

Yeah, my bad, the coil numbering isn't all that relavent to the injector question but yes, 1/4 and 2/3. Coil output A from the MegaSquirt should be to 1, not 2 or 3.. Which is what leads me to believe that the injectors are firing out of order too.
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Re: Making sure correct injectors are firing

Postby jsmcortina » Sun Mar 04, 2012 5:35 pm

That's possible if the A and B wires from the dizzy are transposed ? Or the code is backwards.

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Re: Making sure correct injectors are firing

Postby UnaClocker » Sun Mar 04, 2012 5:51 pm

Yeah, I ran the wires directly from the MS to the external IGBT's, then from them directly to the coils. Definitely got A going to 2/3. Is there a trigger offset # I can change with this mode, like put 360 in there and get it flipped around? Or would it need to be changed in the code?
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Re: Making sure correct injectors are firing

Postby jsmcortina » Sun Mar 04, 2012 5:57 pm

Swap the two sensor wires from the dizzy. Same deal?

Changing the code is trivial if the dizzy wiring is presently correct.

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Re: Making sure correct injectors are firing

Postby UnaClocker » Sun Mar 04, 2012 6:25 pm

I'm pretty sure I've tried swapping them and it won't sync up. Maybe I need to change the trigger edge while I'm at it? The two sensors are something like 60 degrees apart, so I'm pretty sure it won't work swapped, but in the interest of being thorough, I can go try that if you think it's an important test.
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Re: Making sure correct injectors are firing

Postby jsmcortina » Sun Mar 04, 2012 6:41 pm

I thought they were 180 crank degrees out? (from memory)

If it is only 60 then it isn't going to work.

Changing the outputs is the code is simple.

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Re: Making sure correct injectors are firing

Postby UnaClocker » Sun Mar 04, 2012 7:05 pm

Yeah, the top of this page has the original information you used when you made this mode, if you need it for reference at all:
http://www.turbododge.info/22manual
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Re: Making sure correct injectors are firing

Postby UnaClocker » Sun Mar 04, 2012 7:33 pm

Ahh, my memory was a bit off too. 160 degrees, not 60.. Here's a picture of the pickup module:
Image
The code is written for 160, not 180, right? :)
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Re: Making sure correct injectors are firing

Postby UnaClocker » Mon Mar 05, 2012 9:51 pm

Ok, while I was installing new injectors today, I plugged them in shifted down by 2 as discussed here. Definite improvement. Far better throttle response, and more torque, when it's not misfiring.
James, when you're in the code changing the phase of this mode, could you confirm that the triggers are set to be 160 degrees apart, and not 180 (320 crank degrees, rather than 360). That's my last hope in nailing down this persistant misfire problem. I'm totally certain there's nothing wrong with the car/engine at this point.
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Re: Making sure correct injectors are firing

Postby jsmcortina » Tue Mar 06, 2012 5:06 am

Could you post a composite log of cranking using "log crank and cam."

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Re: Making sure correct injectors are firing

Postby UnaClocker » Tue Mar 06, 2012 12:35 pm

I'll do that the second I get home this evening. I believe that's just the standard composite logger option? It seems to capture both signals when I use that. I looked around at the settings and didn't see anything else related to it. Thanks.
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Re: Making sure correct injectors are firing

Postby jsmcortina » Tue Mar 06, 2012 12:56 pm

Change the ignition mode to "log crank and cam". The engine won't start but it will log both edges of crank and cam.

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Re: Making sure correct injectors are firing

Postby UnaClocker » Tue Mar 06, 2012 6:01 pm

Ok, I set it to log crank and cam, made sure the noise filters were completely off. Power cycled, and cranked until data showed up on the screen. This is the composite log from that.
Seems like the teeth from the windowed vane aren't showing up as equal sizes. That's very peculiar, probably just small variations in cranking speed though. Hope this data helps, anyways.
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Re: Making sure correct injectors are firing

Postby UnaClocker » Fri Mar 09, 2012 7:13 pm

Did that composite log contain useful information for you James? I imagine this issue is on the to-do list now and I should just sit back and chill, just wanted to make sure the data was what you needed.
Also, I noticed on the Manual page: http://www.msextra.com/doc/ms3/ignitionmodes.html
It say N for sequential in Chrysler 2.2/2.5 mode.. Typo, I assume..
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Re: Making sure correct injectors are firing

Postby jsmcortina » Sat Mar 10, 2012 4:36 am

I'll use that log to review the firmware code.

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Re: Making sure correct injectors are firing

Postby UnaClocker » Sat Mar 10, 2012 12:24 pm

Ok, Cool. Thanks for your time, I appreciate it. :)
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Re: Making sure correct injectors are firing

Postby UnaClocker » Tue Mar 27, 2012 11:55 am

Any luck on this yet, James?
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Re: Making sure correct injectors are firing

Postby frank_ster » Tue Mar 27, 2012 2:12 pm

i wonder if a timming light could be adapted to do this .. or prehaps a bright led flashing would be enough to flash at the damper ?
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