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Old 06-02-2019, 03:10 PM   #29
Jesse36m3
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I had this exact same problem with similar negative fuel trim logs and turned out to be a bad coil pack. Since I was around 80k I just did all of them. Reset all the DTCs and it was back to normal. Might want to look into that. I didn't have any misfires either, which was weird. May have just been on the cusp of completely failing.
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Old 06-02-2019, 08:23 PM   #30
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That makes as much sense as anything.

For your catch can, I would run the CCV (driver side) to a vacuum port upstream of the turbo. I had dual catch cans and even when boosted never saw anything on the CCV side. I would run the PCV outlet to the catch can where you currently have the CCV, leave the other port blocked then run the top outlet to a check valve and then to a port on the manifold.
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Old 06-02-2019, 08:34 PM   #31
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Originally Posted by Jesse36m3 View Post
I had this exact same problem with similar negative fuel trim logs and turned out to be a bad coil pack. Since I was around 80k I just did all of them. Reset all the DTCs and it was back to normal. Might want to look into that. I didn't have any misfires either, which was weird. May have just been on the cusp of completely failing.
So my tuner sent me a revision so hopefully it'll fix the issue. My car only has 8k miles so I don't think the coils or spark plugs would be out. Only time will tell, will update after crusing at 80 again.
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Old 06-02-2019, 08:38 PM   #32
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The crankcase vent is run upstream of the MAF in stock configuration, so it is always pulling in unmetered air.
The PCV valve at the back of the block goes to the manifold so sees vacuum anytime you aren't at full throttle or seeing boost. The ventilation port incutebus has his catch can connected to under the A/C is not valved so air flows both ways. When the manifold has vacuum it suck air from the PCV which is sucking the air from the block (with fuel and oil vapor) which inturn is sucking air through the open port from the metered air from your intake pipe.

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So... about my catch can setup
You need to connect your vent to air catch can to the PCV valve at the back of your block and connect the vent you currently have it connected to, to the nipple on your intake that you were asking about.
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Old 06-08-2019, 04:24 PM   #33
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So James just told me that there's no fix for the afr leaning out. Told me that jdls kit is just like that and my laf is going crazy and it's something I have to deal with. I find that pretty odd..
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Old 06-09-2019, 10:31 PM   #34
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Any other suggestions? I'm getting pretty concerned with my afr and fuel trims, it tends to buckle much more consistently after a pull.
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Old 06-09-2019, 10:47 PM   #35
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Fuel trims just cruising with some buckling but notmuch

https://datazap.me/u/incutebus/log-1...0&data=3-4-6-8
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Old 06-09-2019, 10:50 PM   #36
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Catching a big buckle in action

https://datazap.me/u/incutebus/log-1...og=0&data=2-22
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