Audi S2 ABY overboost Motronic recovery

[Audi-Porsche Avant RS2]

Thanks a lot!
Now I go to made the pressure test part and then I make the test.
Bye

Alessio

[JamesHarrold]

Alessio....

Hi, I had/have the same problem, although it is intermittent.
It is a bit of a pain, but you must make sure you check everything, even the 4 bolts which hold the throttle body to the inlet manifold, one of mine was finger tight!

Someone told me on here once "pressurise the system and then go have lunch" if it is empty after half an hour, you have a LEAK.

Good Luck

James

[Audi-Porsche Avant RS2]

Hello, also my problem I think that it's intermittent, because sometimes I haven't problem. Tomorrow I pressurise the system, but I must pressurise all the circuit after the MAF and before the throttle? I don't understand which parts I must disconnect from the circuit and which not. For example, N75, pop off valve, I mustn't disconnect?
Thanks a lot!
Bye

Alessio

[UrS4boy]

Tomorrow I pressurise the system, but I must pressurise all the circuit after the MAF and before the throttle? I don't understand which parts I must disconnect from the circuit and which not. For example, N75, pop off valve, I mustn't disconnect? Thanks a lot! Bye Alessio

Seriously, I think it would be easier to just fly to Italy and do this for you than try to make you do it yourself. Here is what I suggest to the AAN people (you will have to figure out the 3B or ABY differences):

http://forums.audiworld.com/s4s6/msgs/217734.phtml

[veneto rs2]

Hello, sorry, where can I find a complete map of the S2 ABY sensors? I means a map like pictures.
Thanks a lot!
Bye

Alessio

ABY motor sensors images text in Italian







.

[Audi-Porsche Avant RS2]

Thanks a lot!
Now I go to make the test and then I post it the results.
Bye

Alessio

[Audi-Porsche Avant RS2]

Hello friends, I hope that I have finally resolved this problem. The problem is the MAF, because I have change the two old MAF that I have try on my S2, with the MAF of my RS2 and now I have no problem. for now
Thanks a lot for your informations!

Alessio

[Audi-Porsche Avant RS2]

Hello, the recovery problem is returned and I think that is really intermittent because when I change the MAF with another one the car running well for some days. Now I have mount a new N75, new pop off valve and also check all boost hoses, wastegate valve and all the parts that can cause this problem and are ok for me. When I make the diagnosis the fault codes that I read are three: 00544 boost pressure to maximum exceeded, 00513 engine speed sensor and I think is normal read this error when engine not running and 65535 control unit faulty error and I think that the real problem is in the ECU or in the cable between ECU and MAF, today I have test the car with another ECU and the car running well, the only problem is that I think the engine with this ECU is too low to take rpm when I push the gas, probably because the chip inside this ECU are too rich with fuel because this ECU is tuned by MTK in the far 1994 I have read for 65535 error that causes are earth connection to ECU contacts 10, 14, 19 and 24 or a problem inside the ECU, with this problem the possible effect are that engine does not start or with ignition on, it isn't voltage at contact 37 of the ECU. Contact 37 of the ECU is connected to pin 5 of the MAF and the colour of the cable at the MAF is blue/black, this pin I have read in this forum that when the ignition is turn on is at 12 V is correct? Is at 12 V also when the engine running? I have check with a tester and I have see that is at 12 V when the ignition is turn on but the voltage go down slowly with the time, how is possible? When the engine running there are about 13-14 volt, is this correct? If all this is correct I don't know why I have 65535 error and the protection problem only when turn on the overboost. I have see also that pin 10 and 19 are ground for MAF and also other sensors. Can I know all the voltage range at the MAF pin for check if the MAF really work perfectly or not? Thanks a lot!

Alessio