smoke be gone!

Discussion in 'VW Mk4 Jetta, Golf, New Beetle, Passat TDI forum' started by Hawkbox, Mar 20, 2012.

  1. Hawkbox

    Hawkbox New Member

    Joined:
    Mar 19, 2012
    Messages:
    8
    Car:
    2000 golf
    2000 golf that driving me nuts. Blew the turbo up almost two years ago now and installed a new one along with timing belt and the works. Ran okay for a bit and then I could hear a hiss and after getting worse or a while it would go to limp. Ran it down to leaking exhaust gasket. Fixed that and it was better but never right right. Car would start up after cooling down completely and run pretty well, go somewhere, stop at the store, comeback and start the car and it would run like crap, tons of black smoke on acceleration and sometimes it sounds like the valves are clattering a bunch, so you back off the accelerator baby it for a while and sometimes it quits smoking and runs great and other times its like the cars in the new diesel commercial smog all the way home. I've done boost leak check and found nothing. Just seems like I get it right for a month or so and it acts up on me again.
    Help me out here please!
    thanks
    mike
    login to remove this ad
  2. Hawkbox

    Hawkbox New Member

    Joined:
    Mar 19, 2012
    Messages:
    8
    Car:
    2000 golf
    So I replaced vacuum lines that looked suspect but check good. MAF sensor was giving some weird values so I cleaned that and it made a difference but driving and watching the screen is a trick. I got a code driving in to work this morning of 17964 so I'm thinking that I need to check the actuator and possibly the N75 valve or is there a way to check it via VAG Com that I'm not aware of, and am I on the correct path?
    thanks
  3. Keithuk

    Keithuk Super Moderator

    Joined:
    Aug 29, 2010
    Messages:
    5,342
    Car:
    2010 Golf GTD (170) CBBB
    Location:
    Stoke on Trent, England
    Welcome to the forum. welcometomyturbodies

    VAG Error Code: 17964
    EOBD II Error Code: P1556

    Fault Location:
    Charge Pressure Control - Negative deviation

    Possible Cause:
    Reduced power output
    Limp mode

    Boost Pressure too Low.
    Hoses/Pipes incorrect connected, disconnected or leaking.
    Charger Pressure Control defective VNT (variable nozzle turbo): nozzles stuck.

    Possible Solution:
    Check Hoses/Pipes to/between Components.
    Check Solenoid Valve for Boost Pressure Control (N75).
    Check / Clean / Replace Charge Pressure Control Check / Clean mechanism for variable nozzles.
    Solenoid Valve for Boost Pressure Control (N75) defective.

    As taken from my http://www.myturbodiesel.com/forum/f9/free-eobd-ii-error-codes-software-2919/
  4. Hawkbox

    Hawkbox New Member

    Joined:
    Mar 19, 2012
    Messages:
    8
    Car:
    2000 golf
    I spent my weekend tearing this thing apart and putting it back together. Low boost was from compressor wheel having something get in it and having the vanes wear down to nothing or so I suspected. Replaced turbo, cleaned everything, intake and egr, pipes, hoses, inner cooler, anyway it's clean. Replaced leaking cam seal and radiator while I had it apart. Oil change and new antifreeze. Fire it up and take it for a spin and no codes but it seemed like it went in and out of limp mode. It was late so I crashed and took it to work this morning. Again this morning no CEL but the black smoke was terrible at times and then it would go away only to start spewing black smoke again. So you start questioning yourself about what you missed? I set the actuator with a mytyvac and check all the vac lines that didn't just replace.?? So I stopped at the mid point of my travel and unplugged the MAF. No more black smoke. It ran smoother that it has in a while, a little less power going up hills but otherwise it ran better and no smoke. Bad MAF ??? I have at times seem MAF sensor readings at 1400+ at idle but it changes. ???
  5. Hawkbox

    Hawkbox New Member

    Joined:
    Mar 19, 2012
    Messages:
    8
    Car:
    2000 golf
    I got home via unplugged MAF and hooked up VC lite to see what the MAF was doing and at idle I was @ 1285-1455. Took the MAF off and cleaned it and it made a big difference but I still don't think it correct. Going up a hill it tells me it should be seeing 825 or so and actual is reading 1250 constantly with no variation unless I release the foot pedal. Feedback appreciated.
    thanks
    mike
  6. Seatman

    Seatman Active Member

    Joined:
    Jul 9, 2010
    Messages:
    5,214
    Car:
    2000 Mk4 Golf Estate 1.9tdi 174 bhp
    Location:
    Scotland
    Mods:
    PP764's, turbo and mapping

Share This Page