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High Knock Correction - Where to Next?

1K views 13 replies 3 participants last post by  danny chapman 
#1 ·
Hello Everyone!

I rarely try to go WOT when daily driving, but it has been known to happen when called for. I noticed that tell-tale signs of Knock (Sounded like marbles in the engine) when I was at WOT. I had only previously used RomRaider/ECU Flash to pass emissions due to my exhaust and knew I would need a tune at some point, but the sound of knocking made me realize this needs to happens sooner rather than later.

I have been reading all weekend about logging and how to read them, but wanted some advice on how to proceed. I will be doing a 3rd gear pull tomorrow (either on my way to or from work) so I can dissect it further, but decided it may be a good idea to use Learning View and figure out what my FLKC was. As seen in the screenshot, it reaches -5.27 in one of the cells...Is there anything I should do before making my log tomorrow? I really don't want to be WOT as much as possible, and I don't notice any knock when I'm only half throttle regardless of RPM. Help?

2003 WRX - Pretty much stock except for the below mods
Catless Up-pipe
3 inch APS TBE
Mishimoto TMI

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#2 ·
You have high learning in column C and D. I'd take a look and make sure you don't have a vacuum leak.

Sent from my SAMSUNG-SM-G890A using Tapatalk
 
#5 ·
Feel free, but I'm going out on a limb and saying you have a mechanical issue. Vacuum leak, injector solenoids, or O2 sensor are at the top of my list. Fueling issues can be very difficult to track down

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#6 ·
Ok, I finally seemed to have gotten all of my parameters correct. I also tried to find the boost leak using soapy water but didn't get any luck. I will likely have to do a pressure test unless someone has a better idea.

I can see lots of knock correction and a dip in boost. I'm not 100% sure how to read these yet, so I apologize for my ignorance!

https://drive.google.com/file/d/0B-AeV1d8DYx3ZS1OeVR2SUVGN3M/view?ths=true
 
#14 ·
have you scaled the maf? like above make sure no leaks etc.. either pull some timing from base timing or richen her up a bit. what are you boosting at, with a catless exhaust it will be alot more free flowing so might have to adjust w/g duty to keep it in check. also if you can check compression and valve clearence to rule out a few. Also enable the dtc reader, so if any codes show it will point you in the right direction thats what its for lol nice colour btw
 
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