Oil in throttle body

[btomkovic]

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.

[NetLogic]

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

[Dan[FN]6262]

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.

[MikeWire]

Take a look under the intake manifold for the PCV.

[notob6]

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?

[mattiouti]

turbo seals?

[Dan[FN]6262]

did you notice any difference when you got rid of yours?

nope, not at all. just less clutter and hoses and crap there now

[Dan[FN]6262]

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

[btomkovic]

"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.

[wolfdog]

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.

[old guy]

"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).

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.

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.

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.

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.

[Dan[FN]6262]

Old Guy saves the day again!

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

Welcome to AZ hell

[diagnosticator]

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.

[coowhip]

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.

[diagnosticator]

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.