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Andy's 1996 GM 3.1L V6 in a 1932 Ford Coupe (11th)
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DeuceEFI
LQFP144 - On Top Of The Game
Joined: Thu Feb 25, 2010 3:57 am Posts: 571 Location: Gosport, IN USA
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I am able to introduce FreeEMS engine #11, my 1996 GM 3.1L V6 engine... It is using a Jaguar A3 board with FreeEMS-0.2.0-SNAPSHOT-99-gc76a4e0-DEV-EvenTeeth-Both-3and1.s19 firmware, using a flat 60% VE table and no ignition advance other than the 10 degree BTDC limp home mode built into the GM DIS module. First run video: http://youtu.be/rCacE4CE4R8Watch for the flame coming out of the open header near the end of the video  Second run with pan around engine: http://youtu.be/MM2kjRFz0NoTODO: Fred and I need to figure out the ignition advance to send to the DIS module... EDIT: added car in title 03/13/2012
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File comment: Jaguar A3 after a successful run on my 3.1L V6 relaxing with a glass of red wine in front of my development computer.
Jaguar_A3_and_Wine.JPG [ 494.7 KiB | Viewed 13042 times ]
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Wed Mar 14, 2012 4:27 am |
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Fred
Moderator
Joined: Tue Jan 15, 2008 2:31 pm Posts: 15376 Location: Home sweet home!
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Once again, congratulations on your efforts and achievements! :-)
I have a few commits and documentation things to get out of the way, but getting you some advance really needs to be number one after those things, as it's not really functional until then. So this is my commitment to start developing a GM DIS specific decoder for you. I'll let you know when I start on it, hopefully within a week. You can test as I go, if that suits you :-)
Nice photo, too! :-)
Fred.
_________________DIYEFI.org - where Open Source means Open Source, and Free means Freedom FreeEMS.org - the open source engine management system FreeEMS dev diary and its comments thread and my turbo truck!n00bs, do NOT PM or email tech questions! Use the forum! The ever growing list of FreeEMS success stories!
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Wed Mar 14, 2012 4:37 am |
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DeuceEFI
LQFP144 - On Top Of The Game
Joined: Thu Feb 25, 2010 3:57 am Posts: 571 Location: Gosport, IN USA
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A photo of the car 
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Deuce_Coupe.JPG [ 203.21 KiB | Viewed 13028 times ]
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Wed Mar 14, 2012 5:45 am |
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DeuceEFI
LQFP144 - On Top Of The Game
Joined: Thu Feb 25, 2010 3:57 am Posts: 571 Location: Gosport, IN USA
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Binary log file of the Deuce's GM 3.1L V6 starting and running with RPM increasing and decreasing. Also has an engine restart after it died during falling RPMs.
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File comment: Binary Log of GM 3.1L V6 running on Jaguar A3 for FreeEMS board
DeuceTestLog1.bin.zip [115.99 KiB]
Downloaded 780 times
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Thu Mar 15, 2012 4:37 am |
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Fred
Moderator
Joined: Tue Jan 15, 2008 2:31 pm Posts: 15376 Location: Home sweet home!
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Well! That certainly explains why it dies when you lift! Load these: - RPM
- Cam sync
- primary teeth seen
- secondary teeth seen
When your RPM is decreasing there are NO cam pulses coming in, so sync is lost via "too many primary pulses before sync pulse" mechanism. If I had to guess, I'd say that the engine has a physical fault, but perhaps it's just the way that GM DIS works? If it works like that, we can handle it, but we need to understand why it does that and what it means. If it's not supposed to work like that, then you need to fix your engine :-) I thought you told me that the cam pulse was a direct signal from the distributor/CAS unit and not processed. Let me know what you know so we can go forward from here. Once this is solved it shouldn't die anymore. It was dying from lack of fuel, which is what I suspected, though I thought from a lean zone, when really it was from total absence of injection. Fred.
_________________DIYEFI.org - where Open Source means Open Source, and Free means Freedom FreeEMS.org - the open source engine management system FreeEMS dev diary and its comments thread and my turbo truck!n00bs, do NOT PM or email tech questions! Use the forum! The ever growing list of FreeEMS success stories!
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Thu Mar 15, 2012 8:47 am |
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DeuceEFI
LQFP144 - On Top Of The Game
Joined: Thu Feb 25, 2010 3:57 am Posts: 571 Location: Gosport, IN USA
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Here is the log from this evening's session after tightening the battery cables at the battery. Have I mentioned the battery is under the car under the passenger floorboard? LOL
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File comment: Log file of engine running with battery cables tightened.
Deuce03152012_1833.log.zip [449.74 KiB]
Downloaded 552 times
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Thu Mar 15, 2012 11:38 pm |
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Fred
Moderator
Joined: Tue Jan 15, 2008 2:31 pm Posts: 15376 Location: Home sweet home!
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Still dodgy, and in the video you can see the LEDs go dark on the over run. Other signals look clean though. BRV is pretty stable, but a bit high, needs calibration. IAT and CHT are noise free. TPS is clean too. You get some bad packets, and always when on the throttle. Maybe a bad connection in the serial line with the engine vibrations? It looks fairly shaky in the video, could be shaking something loose. MAP is smooth, as is RPM.
IE, solve the comms interference and solve the CAS drop out and you're in good shape. The ball is back in your court :-)
Next time load up the log and check sync vs rpm vs secondary count etc before uploading so you can self-confirm that you've really fixed it. Save the upload cycle on your low bandwidth connection too :-)
Fred.
_________________DIYEFI.org - where Open Source means Open Source, and Free means Freedom FreeEMS.org - the open source engine management system FreeEMS dev diary and its comments thread and my turbo truck!n00bs, do NOT PM or email tech questions! Use the forum! The ever growing list of FreeEMS success stories!
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Fri Mar 16, 2012 12:44 am |
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DeuceEFI
LQFP144 - On Top Of The Game
Joined: Thu Feb 25, 2010 3:57 am Posts: 571 Location: Gosport, IN USA
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Log with new CAS
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Fri Mar 16, 2012 9:49 pm |
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DeuceEFI
LQFP144 - On Top Of The Game
Joined: Thu Feb 25, 2010 3:57 am Posts: 571 Location: Gosport, IN USA
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This time I warmed up the engine, then throttled up a couple of times... More flames out of both headers and smoother idle.
Log after PNP USB mod
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Fri Mar 16, 2012 11:17 pm |
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Fred
Moderator
Joined: Tue Jan 15, 2008 2:31 pm Posts: 15376 Location: Home sweet home!
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Perfect, good work! May the tuning begin :-)
_________________DIYEFI.org - where Open Source means Open Source, and Free means Freedom FreeEMS.org - the open source engine management system FreeEMS dev diary and its comments thread and my turbo truck!n00bs, do NOT PM or email tech questions! Use the forum! The ever growing list of FreeEMS success stories!
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Fri Mar 16, 2012 11:43 pm |
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