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Closed loop breaking up

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Old Jun 20, 2017, 01:28 AM   #31
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With no data on the table i can pretty much that either your injectors or map sensor might be faulty.

- Did you notice the volts while the car was running rich ?

I've got the MAP sensor logged. It could definitely be the scaling though. It seems to be outputting a good number in the log, but it's not an officially supported MAP sensor. Corbin (my tuner) made a scaling for it that he said would work though. It's a GM 4 bar. I can't run a standard Evo map sensor because the JDM manifold doesn't have a provision for it. Tuning SD is one of those places where my knowledge is still lacking, so I'm not sure how to tell if the MAP sensor scaling could be the issue.
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Old Jun 20, 2017, 03:20 AM   #32
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Now you are talking. Can you post up a pic of your intake manifold and bin file if your tuner doesn't have an issue?
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Old Jun 20, 2017, 03:24 AM   #33
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Can you fit a jdm evo 7 intake manifold ?
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Old Jun 20, 2017, 07:59 AM   #34
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Here's how I have it set up currently:


I'll probably pick up a GM 3 bar MAP since the scaling for that one has been set up in ECUFlash already and I've got the rest of the car set up to run a GM style MAP. It's just this oddball GM 4 bar that doesn't have a proper scaling. Basically this is an Omnipower GM 4 bar MAP. I had originally assumed that the Evo Omnipower 4 bar MAP would have the same scaling when I ordered it. When I got the car to the tuner I found out this wasn't the case. He said it would work though and made a scaling for it using custom "SD MAP Sensor VE and Calibration" numbers and the setting for the Omnipower Evo style 4 bar. I think it's definitely a possibility that that's what the problem is. The bin file is the standard one for Tephra v7. No custom scripts added.
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Old Jun 20, 2017, 08:10 AM   #35
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Aah Great ! Hopefully this will resolve the issue. Fingers crossed.
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Old Jun 20, 2017, 08:12 AM   #36
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Aah Great ! Hopefully this will resolve the issue. Fingers crossed.
Yep, we shall see! I'll order one when I get back from Pikes Peak. The PPIHC race is this weekend and I'm driving out there with a buddy of mine for it.
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Old Jun 22, 2017, 06:49 PM   #37
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I second the MAP sensor! Had a very similar issue before. Either way good luck and let us know what you find!!
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Old Jun 22, 2017, 06:50 PM   #38
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Also do you think setting the car up to just run on open loop just to see what it does may help you narrow it down?
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Old Jun 23, 2017, 07:06 PM   #39
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Just a thought. You mentioned you deleted your pcv, and added a catch can. That's great but if done incorrectly then that's your issue.

did you not add a check valve to the catch can loop? If not then it's a vacuum leak, so at cruise your fueling is all over because of that.

What are your trims like? I suggest putting the pcv back. You should have a line from your intake manifold going to the can and also another from your pcv going to it. And cap the vent. This way you don't bleed crankcase pressure.

Hope this input helps, something mechanical cannot be diagnosed over a computer, but it's an idea for you! Good luck!
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Old Jul 5, 2017, 04:40 PM   #40
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PROGRESS HAS BEEN MADE. So today I realized that my fuel trims and my timing advance are both bouncing around consistent with the misfire. Tried unplugging the knock sensor and the CAS to see if it would make a difference and nada. Timing advance is jumping between 5 and 18 degrees on the log. That would DEFINITELY make the engine react the way it is. Just gotta figure out why now...

Log is attached
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File Type: csv EvoScanDataLog_2017.07.05_18.54.28.csv (129.1 KB, 0 views)
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