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Thanks, I marked the current position and moved the nut about 2mm towards the actuator. I saw no difference on the boost gauge so I'm going to try bypassing the N249 valve at the weekend to rule it out.

Does anyone know if I need to adjust the actuator so I get 6PSI on my boost gauge when the N75 is unplugged? If so which way do I need to turn the nut, towards the actuator or away from it?

OK I'll give that a go, the lambda code hasn't come back though. I did some more reading and came across this thread - http://www.audi-sport.net/vb/a3-s3-forum-8l-chassis/164669-actuator-installed-help-setup.html When I run the car with the N75 disconnected I get just 4 psi on my boost gauge...

I don't have any symptoms of a bad O2 sensor, maybe using more fuel than usual but I need to run a full tank to prove that. The idle is fine and the car drives perfectly other than the lack of boost! Did my 002 and 118 logs reveal anything out of the ordinary?

Thanks for the tip, will try that. I had a full version to use this weekend.

Yes I did but nothing new has been stored. Before I cleared them I had the following - 16514 - Oxygen (Lambda) Sensor B1 S1: Malfunction in Circuit P0130 - 35-10 - - - Intermittent I had this before and it was cleared and didn't turn up for a while, was told not to worry about it and...

Is there anything else I can check tomorrow while I still have this laptop?

Here is a picture of the N75.

Thanks for the quick reply. I've checked the N75, don't think I could of got it wrong due to the way the pipes are shaped, I'll upload a picture in a few minutes. Here is the log of 118 and 002. I did 115 again as well. https://docs.google.com/file/d/0B0iLHKBO0SwgQy1kZDIxQlVtbDA/edit?usp=sharing

I've got a laptop with VAGCOM 409.1 for the weekend so can do some logging. First here is a log of 115 from standing start through the gears - https://docs.google.com/file/d/0B0iLHKBO0Swgb0VmQVZWYUxVV2M/edit?usp=sharing Can someone interpret the data for me please?

I have been searching to find how you know your MAF is bad and the information I find is conflicting. Info I have found - If you unplug your MAF and then the idle gets lumpy and the car lacks power then the MAF is good If you unplug your MAF and there is no change whatsoever then the MAF is...

After some further googling last night I tried unplugging the MAF sensor before leaving for work this morning. It made no difference at all, could a faulty MAF cause this problem? I've read they don't always throw a code. I'm also getting about 50 miles less to the tank but that could be a...

Got the fault codes cleared, took it for a run and then checked them again, nothing stored. Wasn't able to log measuring blocks, the boy didn't have time. Looking at the Ross-Tech site there don't seem to be any restrictions on which block you can log with VCDS Lite, just that you can't log...

I just had a thought, when I originally started looking at this problem I replaced the N249 valve by mistake, it was what Audi supplied me when I asked for the N75. Before fitting the valve the car hadn't made more than 4 PSI of boost for a couple of weeks. After I fitted it I got 15 PSI again...

If you are referring to the fault code it was over boosting because my N75 valve fell apart, the connection for the vacuum hoses literally came away from the rest of the unit. As per my first post this is now resolved. I'll get the codes cleared and am pretty sure I won't get the charge pressure...

I'll need to ring round a few local garages and see if they offer this service.

I was getting the following, which was caused by the N75 being faulty and leaking 17963 - Charge Pressure: Maximum Limit Exceeded P1555 - 35-10 - - - Intermittent I'll have it cleared and check again. The boost holds so I don't believe there is a leak? It definitely boosted to over 15 PSI when...

I had a problem with my S3 at the end of last year, intermittently it would go into soft limp mode and only boost to 4 PSI, it got worse and worse until the times it did boost it wouldn't hold at all. At the weekend I replaced the N75 valve - the old one fell apart when I removed it so it was...

Pretty sure it is plumbed in properly, longest tube from the N75 goes in the air box pipe? By electrically off do you mean unplug it and then when I drive I should get 5 PSI?

OK I found the problem, when I went to change the N75 valve it fell apart! I fitted a new valve today and now it holds boost but only boosts to 10 PSI max. I believe standard is 15 PSI? Do I need to adjust the actuator arm to increase the boost? I remember having to do that with my old Cavalier...