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S4 fluctuating idle afr when cold

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Old Jul 25, 2025 | 06:27 PM
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Crunchywaffle's Avatar
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From: Ontario
S4 fluctuating idle afr when cold

Hey everyone! I’ve run into another issue with my power fc in my six port turbo vert.

when the car is cold started it fires up fine and will idle for a few seconds no problem. After a couple seconds the afr seems to drop dead lean and the car will stall unless I bring up the rpms with the throttle. After a few more seconds it idles totally fine again and I can start driving. The BAC had been deleted so the target idle is set to 0. Anything other than that and I can’t seem to figure out why the car wants to lean out so excessively. Thanks in advance!
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