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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 10-17-2020, 11:51 PM   #1
SamtheKorean
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Is my engine knocking?

Hello guys, always getting some good answers here so Iím gonna ask away. Iím currently running nameless long tube headers with oft stg 2+ 93 octane tune. Few days ago Iíve had p0030 popped up, I believe itís my o2 sensor. I had the CEL for days and it went away by itself.. and now Iím 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
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Old Yesterday, 02:13 AM   #2
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KC learned goes up higher as you step the gas pedal deeper right?

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Old Yesterday, 02:38 AM   #3
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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
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Old Yesterday, 04:24 AM   #4
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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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Old Yesterday, 06:07 AM   #5
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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.
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Old Yesterday, 08:36 PM   #6
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Does the IAM drop after a few minutes? Also a log would be great.
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Old Yesterday, 09:02 PM   #7
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I dunno but tell it to use the doorbell next time
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Old Today, 12:08 AM   #8
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I dunno but tell it to use the doorbell next time


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Old Today, 12:47 AM   #9
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Quote:
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Does the IAM drop after a few minutes? Also a log would be great.
^^^^This. Post a log, be sure to read the sticky's in the software forum, otherwise it will likely be useless.
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Old Today, 10:31 AM   #10
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Does the IAM drop after a few minutes? Also a log would be great.
so when the car is started it starts from .70 and it goes up to 1.00 after few minutes of driving and yes iíll try to upload my log.
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Old Today, 10:33 AM   #11
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I dunno but tell it to use the doorbell next time
donít have one but iíll see if COBB sells a aftermarket one for my fa20
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Old Today, 10:43 AM   #12
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so when the car is started it starts from .70 and it goes up to 1.00 after few minutes of driving and yes iíll try to upload my log.
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.
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Old Today, 10:55 AM   #13
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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?
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Old Today, 11:16 AM   #14
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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.
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