new2mazda

iTrader: (1)

was told that my omp may have gone bad i am seeing car go lean and told possible limp mode but didnt think s4 had that issue?

turboIIrotary

iTrader: (9)

S4 doesn't have limp mode the omp runs mechanically

new2mazda

iTrader: (1)

but no sensors to it whatsoever?

turboIIrotary

iTrader: (9)

Nope there is a rod coming from the throttle linkage that moves it up and down.

Carzy Driver

never heard of a s4 mechanical OMP failing, they may leak but never heard of anything worse than that.

bac22

What year is your S4 and what exactly is happening? More detail info about your problem and we'll be able to provide more relevant information in solving it.

Oh...and whoever you're talking to about your S4...STOP...they clearly have no clue regarding the S4!

new2mazda

iTrader: (1)

a reputable company that has built a few 3 rotors and big fd's sooo i will blame it on me needing to give them more detail.

s4 t2 with vmount, 720 injectors, rtek basic ecu, walbro fuel pump, aeromotive fpr... car goes lean with any throttle beyond light footed and no boost. and i dont mkean 13-14 lean i mean 16+ off chart of my aem uego wideband. and it wont stall but hits a wall at any rpm and boost or no boost.

Zero10

What happened or was changed before it started going lean?

turboIIrotary

iTrader: (9)

I have worked on this car for a little bit iirc the car has had the same problem when it was basically stock, the only thing we haven't checked so far is the wiring harness and fuel pump voltage at WOT.