Is my engine knocking?
 

Hello guys, always getting some good answers here so I’m gonna ask away. I’m currently running nameless long tube headers with oft stg 2+ 93 octane tune. Few days ago I’ve had p0030 popped up, I believe it’s my o2 sensor. I had the CEL for days and it went away by itself.. and now I’m just diagnosing everything and I noticed that my tablet shows KC learning number which is keep going up (anywhere from 0-6.00) during acceleration and sometimes I see anywhere from 0-2.00 briefly on knock corr column during acceleration. If anyone knows any of these symptoms it would mean a lot. Thanks guys

KC learned goes up higher as you step the gas pedal deeper right?

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Yes it does and knock corr sometimes pop up as well

Same here. But without all your engine problems. So maybe it's not the cause of the engine code. Also, the code means you might have faulty o2 sensor. Hmm I'm not sure but I don't think youre knocking. Cuz when ur car knocks, you can tell it's noticable.

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Take a log with the OFT and post it in the tuning section. You will soon get the answers you seek.

Does the IAM drop after a few minutes? Also a log would be great.

I dunno but tell it to use the doorbell next time

:slap:

https://yarn.co/yarn-clip/2bd891a1-3...byhhqqmFx.copy

^^^^This. Post a log, be sure to read the sticky's in the software forum, otherwise it will likely be useless.

so when the car is started it starts from .70 and it goes up to 1.00 after few minutes of driving and yes i’ll try to upload my log.

don’t have one but i’ll see if COBB sells a aftermarket one for my fa20:lol:

IAM is driven by the knock sensor and resets after a engine shutdown/startup cycle. I normally use that as a determining factor as to whether there is significant amounts of knock currently.

KC learned I believe is persistent across engine shutdown/startup, so those values indicate regions where it has detected knock from sometime between the last time you flashed and now. This indicates that your engine is already reducing timing in that region.

So with IAM at 1, and KC Learned at some value, it shows that your engine is not currently knocking, but has knocked at some point in the past.

Ah that makes sense, I know knocking in engine can cause by improper air to fuel ratio, do you think having a faulty upstream and downstream o2 sensor can cause this problem?

Yes, it is definitely possible. The more upstream sensor is the important one for afr as I recall. The one further downstream is just a check to make sure the cat is working , which I think you don't have. Running lean is likely to induce knock.

Any idea what your ltft is? It changes at different load values (load increases with airflow) so you might need a log to see it. Basically if your o2 sensor is messed up, you are likely to see large + or - values in your fuel trim.