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  1. #1
    Active Member Two Rings
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    Aug 09 2009
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    46139
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    healdsburg ca

    Oil in throttle body

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    I took off my throttle body to clean it ( it was pretty foul) and found a fair amount of oil in it and inside the plenum. See photo



    I asked the Audi dealer for a PCV valve and he gave me this:



    But when I look under the intake manifold I do not see where it can possibly go. There is a hose coming out of the crankcase down there and it has a tee that goes to a vacuum line but this thing will not go in there.

    Looking at the front of the engine, while replacing the "manual recirculation valve" I see this metal box with one hose that goes to the cramkcase, the other to the valve I replaced. It must have soemthing to do with PCV, no?


    Any other ideas where the oil is coming from? It is also inside the turbo intercooler and hoses obviously.

  2. #2
    Veteran Member Three Rings NetLogic's Avatar
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    Jan 05 2009
    AZ Member #
    37106
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    02 A4 1.8TQM Avant
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    New Orleans

    Re: Oil in throttle body

    I think the silver part is the crank case breather but some one can correct me if I am wrong.
    Luke

  3. #3
    Veteran Member Four Rings Dan[FN]6262's Avatar
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    Sep 12 2008
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    32962
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    E30//B6 A4
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    South Central PA

    Re: Oil in throttle body

    the hose that is going to the "crank case" is actually going to a boost reservoir. it is there because we are on a single SMIC instead of having duel SMIC. it duplicates a resonate frequency

    fuck it, i got rid of mine.
    |||The Awesome™
    |||CompTurbo 6262underconstruction
    |||1.8Liters of Fury
    |||36psi+Meth
    "nein-reis: My butt"

  4. #4
    Veteran Member Four Rings MikeWire's Avatar
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    Mar 08 2007
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    '72 VW Kombi
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    Montana

    Re: Oil in throttle body

    Take a look under the intake manifold for the PCV.
    -Mike

    BigSkyEuro

    2014 VW Passat TDI SEL DSG
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  5. #5
    Senior Member Three Rings notob6's Avatar
    Join Date
    Nov 23 2006
    AZ Member #
    13623
    My Garage
    B6 a4 1.8t
    Location
    Chicago

    Re: Oil in throttle body

    Quote Originally Posted by Dan[FN]Shank210 View Post
    the hose that is going to the "crank case" is actually going to a boost reservoir. it is there because we are on a single SMIC instead of having duel SMIC. it duplicates a resonate frequency

    fuck it, i got rid of mine.
    did you notice any difference when you got rid of yours?
    Revo stage 1+| Testpipe| Borla Cat Back Exhaust| 380 USRT injectors| RS4 Rear Sway Bar| E***** FMIC| Bilstein Sport Shocks| Tein S Tech| 20% tint all around|

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    Joey Mod, S4 rear, Bigger exhaust tips, fix exhaust leak

  6. #6
    Senior Member Two Rings mattiouti's Avatar
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    Jul 29 2007
    AZ Member #
    19908
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    2003 A4 Quattro
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    Tampa/ St. Pete, Fl

    Re: Oil in throttle body

    turbo seals?

  7. #7
    Veteran Member Four Rings Dan[FN]6262's Avatar
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    Sep 12 2008
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    E30//B6 A4
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    South Central PA

    Re: Oil in throttle body

    Quote Originally Posted by notob6 View Post
    did you notice any difference when you got rid of yours?
    nope, not at all. just less clutter and hoses and crap there now
    |||The Awesome™
    |||CompTurbo 6262underconstruction
    |||1.8Liters of Fury
    |||36psi+Meth
    "nein-reis: My butt"

  8. #8
    Veteran Member Four Rings Dan[FN]6262's Avatar
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    Sep 12 2008
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    32962
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    E30//B6 A4
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    Re: Oil in throttle body

    and its probably the PCV on the TIP that went bad. its looks kinda like a DV.
    |||The Awesome™
    |||CompTurbo 6262underconstruction
    |||1.8Liters of Fury
    |||36psi+Meth
    "nein-reis: My butt"

  9. #9
    Active Member Two Rings
    Join Date
    Aug 09 2009
    AZ Member #
    46139
    Location
    healdsburg ca

    Re: Oil in throttle body

    "and its probably the PCV on the TIP that went bad. its looks kinda like a DV."

    What is the TIP? By DV I think you mean Diverter Valve? By that do you mean what Audi calls the "mechanical recirculation valve"? I replaced that.

    Anybody got a picture of what the PCV valve looks like and where it is under the intake manifold? Mine is a California car although originally sold in New York.

    The silver thing has a hose that sure as hell looks like it goes into the crankcase. I mean it starts at the silver thing and ends at the engine block, a run of about 3 inches so I am pretty sure I didn't lose track of where it went.

    I would show you a picture but I put it all together again.

    Bad turbo seals? Is that a bitch to fix? Does the oil do damage? My plugs were a nice tan color when I changed them, no oily residue. I just passed a smog test so I guess the cat converter is still converting.

  10. #10
    Veteran Member Four Rings wolfdog's Avatar
    Join Date
    Nov 22 2006
    AZ Member #
    13589
    Location
    NJ

    Re: Oil in throttle body

    Yes, that is a PCV valve. Yes, it is under the intake manifold somewhere. Yes, the mechanical recirculation valve is what is referred to here in all cases as the DV or diverter valve. Did you replace it with the 710N (TT stock one) or A4 stock one? Finally, it is normal to find oil in the throttle body, hose, and even SMIC after so many miles. Look at whether or not you might need a new rear coolant flange (coolant leaking out of back of motor and down onto transmission) or valve cover gasket (oil in spark plug wells and elsewhere).

    Welcome to AZ.
    Last edited by wolfdog; 08-14-2009 at 04:16 PM.
    2002 A4 TQMS
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    12/23/09 - My car has been phenomenal to me. Runs strong. Don't think I'm ever going to sell it. Rather throw $7k into it for a refresh than buy a new A4 that has no dipstick.
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  11. #11
    Veteran Member Four Rings old guy's Avatar
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    Dec 28 2006
    AZ Member #
    14483
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    '09 CC VR6 Sport
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    Western Maryland
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    Re: Oil in throttle body

    Quote Originally Posted by btomkovic View Post
    "and its probably the PCV on the TIP that went bad. its looks kinda like a DV."
    Basically there are two main breather valves for the 1.8T. There is a pressure regulating valve and what you are calling a PCV valve (The one the dealer sold you). The pressure regulating valve is located on the back of the valve cover for '03's and later. If yours is an '02 it is located on the other end of the line from the valve cover to the TIP (turbo inlet pipe).
    Quote Originally Posted by btomkovic View Post
    What is the TIP? By DV I think you mean Diverter Valve? By that do you mean what Audi calls the "mechanical recirculation valve"? I replaced that.
    TIP = Turbo inlet pipe. It's the tube running from your air box to your turbo inlet. DV=Diverter valve=mechanical recirculation valve.
    Quote Originally Posted by btomkovic View Post

    Anybody got a picture of what the PCV valve looks like and where it is under the intake manifold? Mine is a California car although originally sold in New York.
    Look at the line that appears to plug into the oil cooler located directly above the oil filter. If you pull that line out the PVC is plugged into the end of it where it plugs into the block.
    Quote Originally Posted by btomkovic View Post

    The silver thing has a hose that sure as hell looks like it goes into the crankcase. I mean it starts at the silver thing and ends at the engine block, a run of about 3 inches so I am pretty sure I didn't lose track of where it went.
    That silver box is a helmholtz resonator. It is designed to eliminate certain frequency noises that occur in the boost track. I removed mine when I changed my intercooler. It did make a difference in the sound under boost but I really didn't feel any performance difference at all.
    Quote Originally Posted by btomkovic View Post

    Bad turbo seals? Is that a bitch to fix? Does the oil do damage? My plugs were a nice tan color when I changed them, no oily residue. I just passed a smog test so I guess the cat converter is still converting.
    Some oil in the intake track is normal for the 1.8T.

  12. #12
    Veteran Member Four Rings Dan[FN]6262's Avatar
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    Sep 12 2008
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    32962
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    E30//B6 A4
    Location
    South Central PA

    Re: Oil in throttle body

    Old Guy saves the day again!

    sorry, i wasnt very explanatory in my post. Old Guy wont steer you wrong!

    Welcome to AZ hell
    |||The Awesome™
    |||CompTurbo 6262underconstruction
    |||1.8Liters of Fury
    |||36psi+Meth
    "nein-reis: My butt"

  13. #13
    Veteran Member Four Rings diagnosticator's Avatar
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    Aug 26 2005
    AZ Member #
    7741
    Location
    Seattle, WA

    Re: Oil in throttle body

    Quote Originally Posted by btomkovic View Post
    I took off my throttle body to clean it ( it was pretty foul) and found a fair amount of oil in it and inside the plenum. See photo



    I asked the Audi dealer for a PCV valve and he gave me this:



    But when I look under the intake manifold I do not see where it can possibly go. There is a hose coming out of the crankcase down there and it has a tee that goes to a vacuum line but this thing will not go in there.

    Looking at the front of the engine, while replacing the "manual recirculation valve" I see this metal box with one hose that goes to the crankcase, the other to the valve I replaced. It must have something to do with PCV, no?


    Any other ideas where the oil is coming from? It is also inside the turbo intercooler and hoses obviously.
    The PCV valve goes in the top of the crankcase breather/oil filter base casting under the intake manifold.

    The cast aluminum box near the DV is a Helmholtz resonator. There is no connection to the crankcase ventilation system via the hose connecting the DV and the resonator box, it is a closed dead end inside the metal box.

    It's normal for oil residue to be in the intake, it is condensed crankcase vapors released into the turbo intake hose by the crankcase ventilation system when there is boost pressure in the intake. When the intake manifold absolute pressure is below ambient, IE, there is a vacuum in the intake manifold after the throttle valve, the crankcase vapors are sucked into the intake manifold after the throttle body, the flow regulated by the PCV. During non boosted operation, fresh make up air is admitted to the crankcase by the crankcase pressure regulator valve (CPRV). During on boost conditions, the flow reverses at the CPRV and crankcase vapors flow into the turbo intake hose from the CPRV instead of being sucked into the intake manifold via the PCV.
    Last edited by diagnosticator; 08-15-2009 at 02:00 AM.

  14. #14
    Veteran Member Four Rings coowhip's Avatar
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    May 11 2008
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    Columbus, OH
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    Re: Oil in throttle body

    A nice pic or diagram of this would be greatly appreciated as far as the "PCV" goes. Otherwise, great info. Needed to replace this as well.

  15. #15
    Veteran Member Four Rings diagnosticator's Avatar
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    Aug 26 2005
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    7741
    Location
    Seattle, WA

    Re: Oil in throttle body

    Quote Originally Posted by coowhip View Post
    A nice pic or diagram of this would be greatly appreciated as far as the "PCV" goes. Otherwise, great info. Needed to replace this as well.
    See item 16, depics top of crankcase breather housing/oil filter base casting, location of PCV.



    Last edited by diagnosticator; 08-15-2009 at 02:27 AM.



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