Thread: Knock at idle?
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Old 09-24-2009, 10:24 AM   #8
Scooby Newbie
Member#: 213473
Join Date: Jun 2009
Chapter/Region: MAIC
Location: York, PA
2004 WRX Wagon 19t
San Remo Red


Originally Posted by wrxsti.l View Post
What do you mean by rich AFR at idle?

After you initially start the car it will run a little rich until the enrichment comp is over, but then it should go to normal CL target (around 14.6 or whatever).

So once you start the car, if it doesn't start targeting your CL AFR target in around 10seconds (assuming your engine is already warmed up), then something else is wrong.

Do you still have stock injectors and airfilter box/MAF?

After the car reaches normal operating temp, the AFR stays around 13.8-14.0. I still have stock airbox with k&n, stock MAF, and stock injectors. I have logs available, just no good way to post them.

I was looking at my map, I am hitting the coolant compensation table, but it should only be removing .022 AFR. The load compensation would also add .303 off of the 14.57 base target. The math doesn't add up to 13.8
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