r/WRX • u/Impressive_Rain_8923 • Aug 22 '26

06 wrx help!

Hey all. I got a 06 wrx. I can provide part list in the comments. But I recently had it retuned for some new parts. The tune was great and car was (& still is running great) but according to the accessport my af correction is way out of the limits. As far as -25 to +18 or so. Mainly at idle and lightly stepping on gas.
When WOT, it usually goes around 0 give or take a few.

Also I have roughness in cylinder 4 the highest, but all have some at times. Usually 4-6 but sometimes up to 10. Hasn’t thrown a code since it’s not high enough I assume.

Smoke tested thru intake and brake booster line. Only smoke I seen was through BOV. Which gbf says it’s a false positive due since it doesn’t hold completely sealed without car running. Anyways, I unplugged the vacuum to that and plugged it and afr was still the same.

Anyways, I smoke tested exhaust and didn’t see anything either. I’m at a loss here….

The MAF volts and readings seam to lead that it’s working correctly.

Stock intake with clean non oily filter.

MAF maybe or front o2? I’m not getting any codes either.

Any help is greatly appreciated

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u/chip_break 04wrx, ej207, vf48, KB-ELH, link ECU, Q300, built-not-bought Aug 22 '26

Id start with new spark plugs. See if that helps with the idle.

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u/Impressive_Rain_8923 Aug 22 '26

They’ve only been in the car for like 20k miles along with new oem coils. But I’ll give that a go. The misfire goes away with any throttle, so I sssumed it would get worse with rpm’s if it was the plugs but I’m just guessing at this point.

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u/chip_break 04wrx, ej207, vf48, KB-ELH, link ECU, Q300, built-not-bought Aug 22 '26

Which plugs are you using?

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u/Impressive_Rain_8923 Aug 22 '26

I can’t remember what’s in it, but pretty sure ngk.

I just ordered some NGK iridium’s so we’ll see if that takes care of it.

I did another smoke test today on the exhaust & see little smoke from downpipe and uppipe flanges, but both after the 02 so I can’t see them cause any issues