S2 with AAN ignition mixture rich, cannot find possible cause

[qba]

Well,everything is as Prj said. ECU doesn't use lambda for some odd reasons, connected or disconnected lambda acts the same and ECU still has same value... Will try to change soft and see if it helps....

Swap to AAN was made summer 2008 but then it ran fine with some other soft till I was offered a new one in January 2009. Lost my bumper in Feb. and started to drive again in July. Shortly after that I got the problem.

Edit: got new soft in Jan. 2010

[rs200]

soo , when your car work on idle , how much boost is on dash?

[qba]

I don't look boost from dash, I have a boost gauge and it shows 0,6 vac

[prj]

Same as my car, and I have no leaks.
Even if he had a huge leak his mixture would not be rich at idle, but lean. This has nothing to do with it.

[rs200]

-0.6 on boost gauge is 0.4bar on dash. am I right? that is ok , let thel that this is ok.

now you remmaind me something.

before 4 month I take out my "revo sms 303 hp" chips because it was not good. I have too lean mixture. but 1 year everithing was good. my revo have 1.4 bar, just like your mtm... my revo was fake, and I thing that your mtm is fake too.

now when I get to stock, my car is ok...

[qba]

As you could read from second post then I don't have MTM, after consulting Prj seems that I also have SMS soft

[rs200]

yes but fake SMS , like I have. this SMS chips went into garbage

[prj]

-0.6 on boost gauge is 0.4bar on dash. am I right? that is ok , let thel that this is ok.

now you remmaind me something.

before 4 month I take out my "revo sms 303 hp" chips because it was not good. I have too lean mixture. but 1 year everithing was good. my revo have 1.4 bar, just like your mtm... my revo was fake, and I thing that your mtm is fake too.

now when I get to stock, my car is ok...

0.6 is 0.6
My urS6 always has had 0.5-0.6 on dash on idle, and my friends, and there is nothing wrong with it.

[qba]

Could be fake too. Well find out, hopefully soon.

[prj]

It's not the software in this case...

[rs200]

I know that all AAN engines on idle have 0.5 or 0.6.. but if that happend on my 3b . there is some boost leak. 100% shore. in my case must be 0.2 or 0.3 .

so the I try to think about that.. why? why? why? .. and maybe the answer is in intake manifold. because friend on rs2 or other friend on 200 20v ,have 0.3 on cold start,after few second 0.2, and stays on 0.2...

[rs200]

so did "qba" have 0.6 or 0.4 ... ? what dash said ? and if he have 3b engine it must be 0.3... MUST..

[rs200]

do you try to change barometric sensor ? maybe they think that is on wrong high. and give more fuel. try..

[pasbogdan]

Try getting into o sensor wire near the ecu and measure voltage again.You said 0.3ohm..
I'll measure mine tomorow.
If the probe disconected shows aprox stoich and when conected ecu sees lean it means stoich measured under the hood is not the same as voltage readed by ecu in the car.
Get a separate wire for probe signal to ecu.

[qba]

No point of changing Baro. Vag-com said exactly the right amount of atm. press. as there was at the moment.