Chris NottMonster Motorsport
Results 1 to 5 of 5
  1. #1
    Reverse Gear

    Status
    Offline
    Join Date
    Jan 2012
    Posts
    14

    Just to say hi fellow s3 owners, and need some advice on emissions/ Lambda sensors

    So Ive been a member of audi-sport for a while now and thought its about time I said Hi!
    Firstly, what a great forum! I joined it whilst looking for an S3 and its been great help ever since. Some brilliant advice on here and inspiring builds.
    I picked up my AMK s3 exactly 6months ago and absolutely love it! Heres a pic of her when I first got it:

    IMG_0450.jpg

    Since owning the car Ive done a few subtle mods like wrapping the grill surround and the lower door blades, Ive had it on the dyno and despite having 175000 miles its still got near enough its factory power! Ive been hit by a pr*ck romanian lorry driver and been declined anti corrosion warranty at coventry audi Ive also recently done a full service including removing the sump and replacing the pick up pipe (thanks for the excellent, in depth how to's!) Theres plenty more Id like to do but probably best to get eduacation out the way first and get some proper funds in :/

    Anyway last week I took the car in for its MOT, it passed everything bar the dreaded emissions! Ive done the complete service, put a bottle of cat-a-clean through the system and got it nice n hot but still no luck. these are the results:

    img010.jpg


    If the car is revved hard the CO emissions drop to under the pass percentage but dont stay there for long before climbing again.
    Its not displaying any faut codes on the diagnostic machine and the engine management light isnt on. Both the Lambda sensors are recieving a voltage from the ecu but dont appear to be adjusting the fueling :s the heater element is on- off on the pre lambda but occasionally flickers on the post lambda.
    Im a bit stumped now whether to replace the cat, pre or post lambda or the whole lot?
    If anyone has any ideas theyd be much appreciated!
    Many thanks,
    Jon

  2. # ADS
    ADS
    Join Date
    Always
    Posts
    Many
     
  3. #2
    Reverse Gear

    Status
    Offline
    Join Date
    Sep 2012
    Location
    beverley E Yorks
    Posts
    23
    Not much of a help but - I had a similar problem with my S3 recently when it failed on emissions.

    I bought some fuel cleaner did a full service on her took it back to the garage and still failed.

    I left the car with the garage when I picked the car up the mechanic was not there only his misses and the paperwork I got said cleaned air sensor.

    After cleaning the air sensor it passed straight away.

  4. #3
    <tuffty/>'s Avatar
    Badger 5 Edition

    Status
    Online
    Join Date
    Sep 2008
    Location
    Gloucestershire
    Posts
    15,027
    What scanner you using? can you scan for fault codes in VCDS and do some logging of blocks? lambda control doesn't kick in until as certain temp... block 031 for requested lambda vs actual, block 001 for lambda control and have a look at block 032 for fuel trims....

    Could be you have an air leak or something thats throwing the fuelling off its stride hence running over..

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

  5. #4
    Vex182's Avatar
    Guess what I drive...

    Status
    Offline
    Join Date
    Apr 2012
    Location
    Hinckley
    Posts
    824

    My Social Networking

    Add Vex182 on Facebook
    When my car failed my emmisions it was down to a coilpack that was *breaking down* car drove normally with an idle that was always perfect too. Never noticed until the garage swapped 1 over, no codes in VCDS at that point too - think it was a weak spark. I think an air leak is more likely though to be honest so it's running rich.
    Silver 2002 Audi S3 225 (BAM) since March 2011.

    Mods: Badger5 2.2 TIP, Jetex filter, PCV delete, 710 DV, N249 bypass, R-Tech Stage 1 TiV Remap, Audi TT Pedals, Red Dogbone, Polybushed tie arms. All silicone boost pipes, Michelin PS3s, Red V6 coil packs, MK4 flat blade conversion, retrofited cruise control.
    Currently: 254bhp - 276lb/ft (174bhp/ton) as of 11/02/2013 On V-Power

  6. #5
    Reverse Gear

    Status
    Offline
    Join Date
    Jan 2012
    Posts
    14
    Thanks guys, it seems I desperately need to get vagcom, would I be able to do the scans and logging with the free, lite version?
    Ive cleaned the MAF sensor and the inlet temp sensor today, they were both black but still no luck with emissions. Ive been using the college's 'Gutman Mega Macs 50' diagnostics machine, its new but pretty awful software tbh. can anyone recomend someone in the Leamington spa, Midlands area I could go to with VCDS?
    Using the diagnostics machine I can see the pre lambda doesnt seem to work in closed loop, but im not sure if this is cos the cat is dead or the pre lambda?
    how would i go about checking for an air leak? visually the exhaust seems ok and i havent noticed a boost leak at all?
    Jon

 

 

Similar Threads

  1. Hi new to site and need some advice..............
    By A3driver in forum A3/S3 Forum (8L Chassis)
    Replies: 9
    Last Post: 15th December 2011, 17:50
  2. Hi, new member and need some advice please...
    By Kev P in forum A3/S3 Forum (8L Chassis)
    Replies: 7
    Last Post: 30th November 2010, 20:16
  3. Hello from a soon (fingers crossed) to be S3 owner and need some help
    By S3clouty in forum A3/S3 Forum (8L Chassis)
    Replies: 1
    Last Post: 3rd February 2010, 22:50
  4. Hi just joined up and need some help here.
    By smudger41 in forum The Welcome Section
    Replies: 0
    Last Post: 27th February 2008, 19:43
  5. Just bought an 2000 A4 1.8 and have some questions
    By cyberdude in forum A4/S4 forum(B5 Chassis)
    Replies: 2
    Last Post: 24th December 2003, 16:57

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO

Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

Content Relevant URLs by vBSEO