Air fuel ratio mix!

[KMEL65STANG]

So question is.....if I'm running rich, it means I need more. Air?! And reverse, lean needs more fuel?!
Basically my codes were p1137 and 39. Bank 1 n 2 rich. Did a boost leak test already. Nothing. Cleaned my MAF. Air filter is clean.
Any thoughts?!

[xhackerekx]

egt sensor made this condition :)

[KMEL65STANG]

Did a bit of research possible leading to spark plugs, coils and or o2's. Sayin that there is fuel n exhaust. One other thing I that the idle drops irregularly. About 900 then dips infrequent. If its a misfire, wouldn't it throw a code? An if it was bad o2's, isn't there a specific code for o2's? Just trying to make some sense. Thanks.

[Max@034]

While the Motronic system is quite intelligent, it isn't perfect. Sensors don't always trigger MIL/CEL, etc. A variety of things can cause richness, such as a vacuum leak or boost leak. For instance, your car reads a certain amount of air coming into the engine intake path via the MAF sensor. If there is a leak before this reaches the cylinder for combustion, then you will have excess fuel for the amount of air the engine originally saw.

A bad MAF sensor doesn't usually throw a code, and cleaning them doesn't do much usually in my experience. Possibly try to temporarily switch MAF sensors with another S4 owner who has a known good MAF. If the MAF is reading more air then there is, rich. Bad O2 sensors reading your exhaust stream as being leaner then it is will cause enrichment, but if you are experiencing it on both banks, it is more likely to be something else. Spark plugs and coils can definitely be culprits as well.

Pressure test the car and try a new MAF sensor. We can always do some tweaking on the tune.

[KMEL65STANG]

Max- thanks AGAIN! I'll try those suggestions. On the MAF, I'll feel retarded cuz I don't know if I have stock or something else? Can I switch it with stock MAF to test? Mines came in this....

[IMG][/IMG]

O34 MAF housing. Thanks for always helping me out bro! Hopefully u don't get into to much trouble doing it!