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  1. #1
    Registered Member One Ring
    Join Date
    Nov 18 2014
    AZ Member #
    295802
    Location
    Australia

    93 Audi urs4 pressure regulator valve problem.

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    Hi guys,

    New to posting on this Forum, my name is Mitch.

    Just wondering if anyone else has had this problem before and if so any ideas and knowledge on whats gone wrong and how it works.

    So ive done a search on the part number, 034 129 101 a and its coming up as a PRV. I had just had the car tuned after
    getting the engine rebuilt with all the good stuff, forged pistons and rods and stroked it from a 2.2lt to a 2.5lt. running a gt3071 garrett
    turbo at the moment. With the dyno tune finished it was running 20psi Boost.

    As soon as i drove it out of the workshop it was whining when it would come on boost. I got it home and found one of the fins
    on the compressor housing was bent, but after taking off all the intercooler pipes, all up there was about 300-400ml of oil in the piping.
    Ive taken the PRV and PCV out of the car, PCV part number is 035 103 245 a. I can blow through both ways of the PRV. The PCV i can only
    blow through one way but that did take a bit of tapping with a screwdriver to free it up.

    So my question is, are you meant to be able to blow both ways of the PRV or is that meant to be a one way valve as well? Could that have
    been what has let go and a piece of that has gone through the pipe that goes through the rocker cover back to the air intake and bent a
    fin on the turbo?

    And also is that why i have got so much oil on the intake side?

    I should also tell you i did a leak down test on each cylinder and that came up ok and compression test as well.

    Sorry for the long post but i hope someone can help me

    Cheers

    Mitch.

  2. #2
    Veteran Member Four Rings PaperToast's Avatar
    Join Date
    Apr 29 2009
    AZ Member #
    41811
    My Garage
    Quadzilla
    Location
    Longmont, CO

    hate to break it to ya, but this is the wrong section for the car you have
    http://www.audizine.com/forum/forumd...-Audi-Classics
    that would be a better place to post
    Rockin' the Rockies
    '01 allroad, 250k woot woot, still boosting on original turbos and tippy, slightly modified. . .

    Scotty@Advanced, "Push it off a cliff, when it hits the ground you should have a few thousand horsepower available for a brief second."

  3. #3
    Registered Member One Ring
    Join Date
    Nov 18 2014
    AZ Member #
    295802
    Location
    Australia

    Ahh damn ok thanks mate

  4. #4
    Veteran Member Three Rings audinutt's Avatar
    Join Date
    Jan 11 2007
    AZ Member #
    14809
    My Garage
    2001 A8l 2001 A4TQM Avant
    Location
    texas

    Quattroworld has an amazing c4 urs car group

    Sent from my SM-N900V using Tapatalk
    2001 Audi S8
    2011 Q7 TDI
    2001 A4 TQ Avant

  5. #5
    Veteran Member Three Rings audinutt's Avatar
    Join Date
    Jan 11 2007
    AZ Member #
    14809
    My Garage
    2001 A8l 2001 A4TQM Avant
    Location
    texas

    This forum states c4 so technically it is the correct forum

    Sent from my SM-N900V using Tapatalk
    2001 Audi S8
    2011 Q7 TDI
    2001 A4 TQ Avant

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