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Old 10-05-2015, 11:21 PM   #1
TheRedStig
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Join Date: Dec 2012
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Default KNOCK!!! Help translate these logs please!

Good day internet citizen.

LONG VERSION.
I have a heavily modded 02 WRX. It's tuned for E85 (Not by me as I am not a tuner) and has been running great til recently it's been throwing a lean code regularly and then I noticed my wideband indicating 13-16 afr in boost. - As a result of this I'm trying to get into understanding my tune and all that goes with it. I replaced my inlet and checked for vaccum/boost leaks and mended what little I found. ----- Tonight I go to do my first real rolling logs with the car and see that the FBKC is logging multiple events all the way to -6.33. I am not a tuner(Yet) but would like to know what my next best step is...IAM and FLKC is 16 and 0 respectively. What is the most likely cause...For all i know it's been this way since my tune was completed over a year ago....


TL;DR

I am seeing -6.33 FBKC at times! No change with IAM or FLNC. Recently the car has been throwing a lean code regularly. Not sure what to do from here. I haven't changed anything since my tuner finished this tune over a year ago. (This is the first time i've logged anyting)

Please give me your feedback on what I should be focused on...worried about..

https://drive.google.com/folderview?...2c&usp=sharing

https://drive.google.com/folderview?...2c&usp=sharing
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Old 10-08-2015, 02:13 PM   #2
yamahaSHO
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Join Date: Nov 2004
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2005 STi - E85
2004 S2000 - E85

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I can't get to the files here at work... That said, my question is have you tracked down what's causing the car to run lean? Is it running lean when you experience FBKC? What is the AFR when it's experiencing FBKC?

Have you checked fuel pressure?
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Old 10-08-2015, 02:28 PM   #3
yamahaSHO
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2004 S2000 - E85

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I used a different computer to get to the logs... Reduce it to good logs and post those only (IE: WOT log from 2k RPM to redline.) as the few logs I did look at where much of use and I'm not going to download that many logs looking for something.
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Old 10-08-2015, 03:32 PM   #4
TheRedStig
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Quote:
Originally Posted by yamahaSHO View Post
I used a different computer to get to the logs... Reduce it to good logs and post those only (IE: WOT log from 2k RPM to redline.) as the few logs I did look at where much of use and I'm not going to download that many logs looking for something.
Thank you thank you thank you. New wideband is arriving today. I'll need to figure out how to get it to talk to romraider but to answer your question no. It was tuned to run a little lean during non boosted driving to save fuel so I assumed that was the issue but when it started doing it more often I knew I needed more info so I learned to log and found the "knock". I have not tested fuel pressure...

I'll take it to the store today and do a pull on the way home.

There are a lot more logs in that folder since I first posted this. I also posted on romraider.

Thanks again
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Old 10-08-2015, 10:31 PM   #5
TheRedStig
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2002 WRX Sedan
Silver

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st an update. Couldn't get the wideband replaced yet. Did drive it to the store. It showed fbkc almost all the way on the way there but basically 0 on the way home for the second night in a row.. No serious pull since I didn't have a good wideband.. Not sure what's up. Excited to get the new wideband going tomorrow hopefully.
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Old 10-10-2015, 02:03 PM   #6
TheRedStig
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Silver

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New wideband is in. Still not reading right. Hopefully a wire came loose and I don't have to wait on a new harness. Replaced plugs and seeing almost zero knock now. Signs of running lean on the old plugs. Will update with new info as I get it.
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Old 10-12-2015, 12:42 PM   #7
86Dreams
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What is this? An
injector laying contest?

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So I went through your logs and what immediately jumped out was that your AF Learning 1 C is very high. it goes from about 7.5 in one log to about 11.5 in another log. This is a DEFINITE problem. + number means that fuel is being added so some how there is unmetered air entering the motor, youve already replaced your turbo inlet so Check your maf sensor to make sure its properly seated and clean. if its the original one just buy a new one.


About your logs... you do not need most of whats in there. depending on what youre looking for you will want to log different parameters. In your case... Turn on feedback and fine knock learning, IAM, A/F Learning #1 (NONE of the ABCD, just 1), Boost, Mass airflow (g/s), throttle position, A/F Sensor 1 Ratio and RPM.

Turn off everything else.

Your long story is pretty short. if the car is heavily modified you will probably want to consult with your tuner since this forum knows next to nothing about your car except that it runs e85

Last edited by 86Dreams; 10-12-2015 at 01:29 PM.
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Old 10-14-2015, 04:56 PM   #8
TheRedStig
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2002 WRX Sedan
Silver

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Quote:
Originally Posted by 86Dreams View Post
So I went through your logs and what immediately jumped out was that your AF Learning 1 C is very high. it goes from about 7.5 in one log to about 11.5 in another log. This is a DEFINITE problem. + number means that fuel is being added so some how there is unmetered air entering the motor, youve already replaced your turbo inlet so Check your maf sensor to make sure its properly seated and clean. if its the original one just buy a new one.


About your logs... you do not need most of whats in there. depending on what youre looking for you will want to log different parameters. In your case... Turn on feedback and fine knock learning, IAM, A/F Learning #1 (NONE of the ABCD, just 1), Boost, Mass airflow (g/s), throttle position, A/F Sensor 1 Ratio and RPM.

Turn off everything else.

Your long story is pretty short. if the car is heavily modified you will probably want to consult with your tuner since this forum knows next to nothing about your car except that it runs e85
Hey thank you for the info. very much appreciated. About to add my mods to my Sig and personal info page. hopefully that helps..

I'm working on the lean condition. The MAF wasn't sealed completely. I'm working on mending that as well as figuring out what else could be going on. I've been conversing with the guys on Romraider and they said something similar about what to log. Going to do that tonight and hopefully get some better info. This was my most recent update to them over there...

Good afternoon,

The spray test didn't give me any useful info sadly.

I did a boost leak test on the intercooler piping (negative for leaks) and then on the inlet and short ram intake and found the MAF opening itself has a small leak. I mean small though. I never pushed it past 3 or 4 psi but it's got a leak for sure. I have added some gasket maker all around it that has almost stopped it but I'll be in the market for a new intake/MAF shortly.

The BOV is venting to atmosphere but isn't "leaking" at least not during the boost leak test. Would I do well to vent it back to the inlet anyway? Wouldn't this cause the car to be rich since it's losing air from the system....

New Wideband is in and is still showing the car running lean. Only dropped to 13 in boost IIRC and still needs to be wired to plug into the laptop so I can log it properly.

Replaced the fuel filter and checked over all the vac lines again...tightened things up wherever possible. Gent at Subaru dealership thinks its the intake manifold itself. I'm getting tired of making no progress.

Where do I go from here? How can I make progress?????
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Old 10-14-2015, 09:33 PM   #9
TheRedStig
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If you haven't read my above comment please do.
Just took a new log. Much better params captured and hopefully more useful info for you.

http://api.viglink.com/api/click?for...Busp%3Dsharing

Last edited by TheRedStig; 10-15-2015 at 01:35 PM.
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Old 10-21-2015, 06:39 PM   #10
TheRedStig
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Any other ideas here??
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