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2006 Impreza WRX Limited
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2,603 Posts
Discussion Starter · #1 ·
Between 4000 and 4800 RPM's I see a lean spot and -1 degree of knock correction. Is this normal?

When I say lean I mean 14.7 is the worst of it...

I have a new O2 sensor that I am putting in tonight because I am getting a misfire code that Supers solved by replacing the 02 sensor. I don't know if that will make any difference with this but I figured I would post and ask.

I have Delta 2000 cams, Borla headers, and a cat-back.
 

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97 Brighton, 4x4
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1,681 Posts
I'm not to sure how the KC works on the NA subaru ECU but on the turbo's there is a stored table of correction that can do this durring certain rpm ranges. Since it's stored it may have just been some crappy gas. I would try doing a reset and seeing if it's still there.
 

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2006 Impreza WRX Limited
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Discussion Starter · #3 ·
I just reset yesterday and ran Shell 87 octane gas. I will give that a try though. Thanks.

Any other things that could cause this?
 

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05 rs 04 wrx 05 sti all black
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Is this at wot? It is normal to be lean for a very short duration of time just at tip in as the car goes from CL to OL fueling. If you have been at wot from low rpm through this rpm and the AFR rises then it there is something wrong, possibly injectors, or fuel pump. Does the AFR go toward rich as you pass this rpm?
 

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2006 Impreza WRX Limited
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Discussion Starter · #7 ·
Yeah it just gets lean for a few hundred RPM then drops back to normal and the KC goes back to 0 degrees.
 
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