I've just checked the readiness settings on mine and they all came back as passed....I think when I saw a failure it may have been that I hadn't run the car up to temp.
Sorry I can't help more, hope your lambda sensor test goes well tonight.
Had to abort the lambda test tonight! S3 Baby came round so I ran some VCDS tests on his post cat sensor and noticed how his voltage was ok where as mine was all over the place. We thought we'd let his car cool down so we changed his drop links befor tackling the sensor. Trying to get the sensor out with an adjustable spanner with only a foot of room under a jacked up car is not the answer! It was in proper tight so I think i'll need a trip to my mechanics to get this out.
I did however change the remaining hoses in my engine bay, charcoal filter hose and the top half of one of the TIP hoses.
After seeing how the voltage should behave on a working car I'm now certain that my problem is either a duff cat or a duf sensor, I just hope its the sensor!
Keep the up the work mate, you'll get to it eventually.
Just recently I think i've got a leak somewhere, so been following your thread. Mine sounds like it's coming from driver side, had a similar sound before Xmas and it was a split hose from the charge pipe to the N75. Everything seems fine around there, did you remove the strut brace to get to the red turbo to charge pipe hose? Also how much is it for a smoke test?
I've definitely got 2 issues at the moment. 1 is the fluttering noise that I've posted about in another thread but it doesn't seem to be causing an actual problem, and 2 is my lack of power, which I now believe to be cat or sensor.
The red hose can be removed without removing the strut brace but it is a hell of a lot easier with it off. I also found it easier to remove the N75 and all the conecting pipes to give a bit more room.
When you put the red hose back on make sure to put the charge pipe end on first as that was where my leak was. The hose wasn't on properly as i'd attached it to the turbo first and hadn't lined it up properly.
As for the smoke test, i'm not sure. The garage I was going to go to said that it wasn't a wait job so I'm guessing it takes a little while to do. I called them up and cancelled it today anyway as i found the leak.
This morning I have been preparing myself for the worse case scenario...... I need a new cat.
What are my options? I dont want to spend Ł600+ at the moment for a 3" downpipe and sports cat though that would be the sensible route. I could wait it out for the Turborevs downpipe that Welly is sorting out and wait to see if their sports cat passes an MOT and also is a decent price or I just go standard cat. Something like this:
AUDI S3 1.8 99-03 Catalytic Converter Cat on eBay (end time 16-Mar-11 10:23:48 GMT)
Any thoughts people?
Regards the smoke test, when I had one done at Jabba it took about 10mins max. I watched the bloke do it, a good idea if your struggling to find a boost leak...
Ok a trip to Badger 5 confirmed I have no boost leak but I do have a tired old turbo that cant move air as well as it used to. This would explain the low MAF readings but I'm still unsure about the weird post cast lambda sensor readings.
I had my map changed from ChippedUK to Revo and haven't checked the sensor readings since so they might have something to do with the map.
I'll get this checked and report back.
Right I went out at lunch and did some logging:
Would you Adam and Eve it! The lambda sensor problem has gone. The voltage is now stable with the Revo map on the car.
I also decided to log my ignition timing EGTs and AITs, they were as following:
Highest timing pull at 6500 was 5.3
EGTs on boost topped out at 875
AITs on boost were 41 high with an ambient of 30ish
I'd say the Revo map was definitely money well spent.
To be fair dude, having seen the state of the fuelling on that map, I am in no way at all shocked.
I even said that to you when I was there after the first couple of runs - not an impressive bit of mapping.
Revo was definitely money well spent, you will have a happier engine for it.