00561 - Adaptation limit (MUL) not reached - but the car is running rich???

[UrS4boy]

My swirl pot and catchtank system deletes the PCV system all together - hence no one-way bleeder valve. The crankcase and head vent into the swirl pot - which then drains to sump and also vents to the catch tank. The catch tank then vents directly into the breather connection after the MAF. ..Andy

I'm done. Good luck.

[Thecrispynoodle]

If they are OEM then anything over 100,000 miles is borrowed time. Mine went at about 120,00 without warning, but others have had an intermittent issue at WOT beforehand, so this could be your issue. Have you given any consideration before to a conversion to a more modern ignition system? Or can anyone lend you a working complete OEM loom to see if that fixes it?

[UrS4boy]

...Seeing that I have a new MAF and spark plugs I guess I need to test the coils and power output stages. Any tips on those??? Andy

I am *such* a sucker.

Coil Testing Info:

http://forums.quattroworld.com/s4s6/msgs/22611.phtml

POS problem vs coil problem testing:

http://forums.quattroworld.com/s4s6/msgs/153152.phtml

I still disagree with the removal of the PCV system because you must have removed the N80 Evaporative Emissions System too. Both were there to help protect the environment. You could have kept the PCV system and still had a catch can, as in this AAN diagram that I modified:

[S2Roo]

Okay, I tested the coils with one of these: http://ww2.justanswer.com/uploads/Mi..._kv_tester.jpg

All coils showed a strong spark at the maximum distance...

Out of curiosity what sensor is telling the ECU that the car is running lean at higher RPM?? I read on the forum elsewhere that on WOT the ECU goes open loop and does not used the lambda for fueling??

Thanks

[UrS4boy]

...Out of curiosity what sensor is telling the ECU that the car is running lean at higher RPM?? I read on the forum elsewhere that on WOT the ECU goes open loop and does not used the lambda for fueling?? Thanks

Okay, it seems like your coils are fine. As for running LEAN (?) I thought your issue was running RICH? Either way, the only way the ECU knows this is via the G39 Lambda/O2 sensor. High RPM can be achieved without WOT. WOT is "sensed" by the ECU based on the throttle position potentiometer signal (you might want to test it).

G39 info: http://forums.quattroworld.com/s4s6/msgs/21012.phtml

G69 / F60 Throttle valve position potentiometer /idle switch information: http://forums.quattroworld.com/s4s6/msgs/20405.phtml

[UrS4boy]

G70 Mass Airflow (MAF) sensor info

You might want to read through to the bottom of this G70 MAF sensor info post. I has an interesting story about Colesy's MAF issue that has some of the same symptoms as you have:

http://forums.quattroworld.com/s4s6/msgs/20442.phtml

[twoqu]

http://www.s2forum.com/forum/showpos...0&postcount=32

[UrS4boy]

http://www.s2forum.com/forum/showpos...0&postcount=32

OR

[S2Roo]

Sorry - I misunderstood 00561 - Adaptation limit (MUL) not reached - I thought this meant lean. As you said it is rich as per the MOT test and the fault code which is consistant.

I read the MAF thread - however as I have replaced this and checked the connection I think it should be okay.

This post: http://www.s2forum.com/forum/showpos...0&postcount=32 was useful, "Not reached means you are running too rich, and it is pulling too much fuel via O2 feedback" given that I am boost leak free, the MAF has been accounted, the coils appear sound I guess the key thing here is the O2 feedback. I checked for leaks in the exhaust system (I figured this could cause a incorrect O2 feed back signal) and there was not any.

I will check group 000 in VAG-COM - value 9 and 10 tomorrow to see if its less than 128 and hence running rich and then chance a new O2 sensor to eliminate that.

I am assuming that the 00561 code is related to my boost hesitation and fluxuation. I find it strange that it sometimes it will run correctly through a few gears only to crop up again later.

Thanks again ppl.

Andy

[Thecrispynoodle]

Sorry - I misunderstood 00561 - Adaptation limit (MUL) not reached - I thought this meant lean. As you said it is rich as per the MOT test and the fault code which is consistant.

I read the MAF thread - however as I have replaced this and checked the connection I think it should be okay.

This post: http://www.s2forum.com/forum/showpos...0&postcount=32 was useful, "Not reached means you are running too rich, and it is pulling too much fuel via O2 feedback" given that I am boost leak free, the MAF has been accounted, the coils appear sound I guess the key thing here is the O2 feedback. I checked for leaks in the exhaust system (I figured this could cause a incorrect O2 feed back signal) and there was not any.

I will check group 000 in VAG-COM - value 9 and 10 tomorrow to see if its less than 128 and hence running rich and then chance a new O2 sensor to eliminate that.

I am assuming that the 00561 code is related to my boost hesitation and fluxuation. I find it strange that it sometimes it will run correctly through a few gears only to crop up again later.

Thanks again ppl.

Andy

I rather assumed you had already changed O2 sensor - that's a given really if its still original. Be warned it may not fix it though just allow you to eliminate something else as root cause. Was the MOT rich reading only at idle or part throttle too? Did it fail as a result?

[prj]

WOT is "sensed" by the ECU based on the throttle position potentiometer signal (you might want to test it).

There is no "WOT" switch on M2.3.2, and TPS is not used for it.

[S2Roo]

"Was the MOT rich reading only at idle or part throttle too? "

Idle and and part throttle.

[UrS4boy]

There is no "WOT" switch on M2.3.2, and TPS is not used for it.

I didn't say there was a switch did I?

No, I did not.

http://forums.quattroworld.com/s4s6/msgs/20405.phtml

[Thecrispynoodle]

I didn't say there was a switch did I?

No, I did not.

http://forums.quattroworld.com/s4s6/msgs/20405.phtml

Maybe he mistook 'MOT' for 'WOT'.

MOT is annual UK Ministry of Transport vehicle safety test for those that dont know, and it includes an emissions test which is where the known rich running (at idle and part throttle) info is from.

[ChrisAudi80]

Thanks for the help UrS4boy.

My swirl pot and catchtank system deletes the PCV system all together - hence no one-way bleeder valve. The crankcase and head vent into the swirl pot - which then drains to sump and also vents to the catch tank. The catch tank then vents directly into the breather connection after the MAF.

Andy

Seems to me that is your problem right there. Dave's reaction is understandable.

I had the same 00561 code on my S6. Took me forever to find the cause.
You know what it was?

My PCV valve was connected wrong way round and not connected on one side. I have the 034 catch can kit. It connects on one side of that PCV. You MUST have this.

Refer to the diagram Dave supplied. After I fixed that, the car ran perfect. No more 00561, no more weird cuts at boost.

Please reinstall the PCV. Crankcase vent tube -> PCV -> hose to catch can.

PRJ says you can safely run without the one way (check valve), but you don't have to remove it. The N80 valve is also connected to this.

After you have done that, check again.