EM TuningMonster Motorsport
Results 1 to 9 of 9
  1. #1
    russwuss's Avatar
    2nd Gear

    Status
    Offline
    Join Date
    Feb 2013
    Posts
    371

    2001 AMK S3 17963 - Boost Pressure Control: Upper Limit Exceeded

    Hi All,

    Brand new to the Audi-Sport forum, first off thanks for saving me a little bit of money on my car insurance

    Purchased a 2001 Audi S3 AMK at the weekend.. very happy with it apart from one issue it's developed.

    When I put my foot down in 3rd the boost comes on as normal, then when it hits about 4k rev's the turbo shuts off and sort of goes into 'limp' mode.

    I borrowed a mates VAGCOM from work and did a fault scan, only fault it found was 17963 - Boost Pressure Control: Upper Limit Exceeded.

    I cleared the fault and went out in the car again, put my foot down in 3rd and the issue happened again - back to the VAGCOM and the fault was back again.

    Cleared the fault again tonight and logged block 115 after reasearching on here and other forums - log proved that the car achieved 2490mbar boost when requesting <2000 then went into limp mode.
    I've uploaded the log here if anyone would like to take a look https://docs.google.com/file/d/0B9EE...it?usp=sharing

    After researching already everyone seems to suggest the N75 or N249 valves, anyone with experience of this issue say this cured their issue? If so I'll check all piping on Saturday then go out and buy a new N75 - is there a specific part no. you'd recommend?

    Other than this VERY impressed with the S3 so far, after coming from a MK2 Golf GTI (and shamefully a Peugoet 206) this is a brilliant car..

    Going to try and give the car a full detail at the weekend also, will post up some pics afterwards

    Thanks in advance!

    Adam

  2. # ADS
    ADS
    Join Date
    Always
    Posts
    Many
     
  3. #2
    russwuss's Avatar
    2nd Gear

    Status
    Offline
    Join Date
    Feb 2013
    Posts
    371
    Forgot to mention, brought the car as 100% standard - so remap shouldn't be an issue.
    Last edited by russwuss; 14th February 2013 at 20:57.

  4. #3
    SEAT owner

    Status
    Offline
    Join Date
    Mar 2012
    Location
    Worcester
    Posts
    75
    I have a LCR so essentially the same engine, mine was running full stage 2 mods but still OE map
    At roughly 6k it used to flow over 200g/s and boost would creep up causing this fault and limp mode (someone did explain in depth why this happens)
    However being so low in the rev range i'd say it is more likely N75 related

  5. #4
    russwuss's Avatar
    2nd Gear

    Status
    Offline
    Join Date
    Feb 2013
    Posts
    371
    Quote Originally Posted by Ronin225 View Post
    I have a LCR so essentially the same engine, mine was running full stage 2 mods but still OE map
    At roughly 6k it used to flow over 200g/s and boost would creep up causing this fault and limp mode (someone did explain in depth why this happens)
    However being so low in the rev range i'd say it is more likely N75 related
    thanks for the reply! For the millions of topics I've read I'm lead to believe it is the N75.. most threads recommend the N75F VW N75 valve, standard version 058 906 283F Genuine | eBay so I'm check for vac leaks, if I don't find anything I'll replace the N75 and report back!

    Thanks!

  6. #5
    Alex C's Avatar
    6th Gear

    Status
    Offline
    Join Date
    Jan 2010
    Location
    Lizard, Cornwall
    Posts
    2,564
    maybe check the hose from the N75 valve to the actuator?
    Alex S3 AMK
    Bilstein B8s, H&R Springs, Neuspeed ARBs, Genuine 18" BBS LMs & LCR Brembos

  7. #6
    <tuffty/>'s Avatar
    Badger 5 Edition

    Status
    Offline
    Join Date
    Sep 2008
    Location
    Gloucestershire
    Posts
    15,041
    Try connecting the hose coming from the charge pipe that goes to the bottom of the N75 to the pipe going to the actuator... (use a bit of pipe to join the exposed N75 ports so you are not drawing in unmetered air) this should give actuator pressure everytime as you have effectively bypassed the N75... if your boost remains consistent then sounds like the N75 is iffy...

    Looking at your log it only does it the once... but I assume as its in limp mode it doesn't clear until you cycle the ignition? does it do it everytime you clear out of limp?

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

  8. #7
    russwuss's Avatar
    2nd Gear

    Status
    Offline
    Join Date
    Feb 2013
    Posts
    371
    Quote Originally Posted by <tuffty/> View Post
    Try connecting the hose coming from the charge pipe that goes to the bottom of the N75 to the pipe going to the actuator... (use a bit of pipe to join the exposed N75 ports so you are not drawing in unmetered air) this should give actuator pressure everytime as you have effectively bypassed the N75... if your boost remains consistent then sounds like the N75 is iffy...

    Looking at your log it only does it the once... but I assume as its in limp mode it doesn't clear until you cycle the ignition? does it do it everytime you clear out of limp?

    <tuffty/>
    Thanks for the reply mate, I'll give that a go tomorrow morning.. hopefully the new N75 will be here tomorrow dinner if it does prove that the N75 is iffy. So buy connecting the two pipes together there's nothing regulating the boost level, therefore I'd expect the requested boost and actual boost pressure to be close right?

    Did another log today also logging block 119 as I read somewhere that's the load on the N75 valve?
    https://docs.google.com/file/d/0B9EE...it?usp=sharing
    at 61secs pressure hit >2400mbar and I felt the car 'pull back' and after that the turbo wouldn't boost as high, pulled up and again the overboosting code was logged on VAGCOM.

    Yep switch the car on and off and the car will boost correctly again.

    Oh forgot to add, had a quick check on the piping around the N75.. all looks ok to me, revved the engine a little to see if I I could hear any boost leaks.

    Thanks again!

  9. #8
    SEAT owner

    Status
    Offline
    Join Date
    Mar 2012
    Location
    Worcester
    Posts
    75
    Interestingly my leon wouldnt clear limp mode on ignition cycle, it had to be done via vagcom

  10. #9
    russwuss's Avatar
    2nd Gear

    Status
    Offline
    Join Date
    Feb 2013
    Posts
    371
    Hmmm, not sure why that is Ronin225 - I definitely had boost have I turned the car off and on again - however it wouldn't be instantly switch back on/off.. over space of a few hours.

    Thought I'd update the post for anyone else who is having the overboost issue, my new N75 arrived today (part 06A 906 283 E) from germanautoparts- fitted within 15 minutes, clear any existing faults on the engine and took it out for a spin.

    Very noticeable difference, power is now all the way through the rev range not just dumped at 3500 - 4000 revs.. peak pressure achieved was 1980mbar which is much lower than before - no faults logged when I got back after test driving - very happy!

    There's a log here https://docs.google.com/file/d/0B9EE...it?usp=sharing of the run I did after the N75 was fitted in case anyone would like to read when they experience the issue.

    Now to try and talk myself out of a remap ;-)

    thanks for all the suggestions!

 

 

Similar Threads

  1. Fault code 17608 Boost Pressure Control Valve
    By Coless3 in forum A3/S3 Forum (8L Chassis)
    Replies: 18
    Last Post: 2nd January 2013, 20:46
  2. 17963/P1555 - Boost Pressure Control: Upper Limit Exceeded :(
    By Dubstep in forum A3/S3 Forum (8L Chassis)
    Replies: 7
    Last Post: 2nd November 2011, 21:39
  3. 16683 Boost Pressure REgulation Control range not reached
    By Kev_M5KPL in forum A3/S3/Sportback (8P Chassis)
    Replies: 7
    Last Post: 16th November 2010, 20:22
  4. boost pressure control valve mechanical malfunction
    By stoneys3 in forum A3/S3 Forum (8L Chassis)
    Replies: 13
    Last Post: 7th September 2010, 20:01
  5. Boost pressure control valve
    By imported_SYNAPS3 in forum A3/S3 Forum (8L Chassis)
    Replies: 1
    Last Post: 6th September 2004, 09:33

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