Looking at my 03 Disco and discovered a fair amount of oil in the throttle body.

I did a search and found little regarding the subject.

Thinking it's possibly a bad PCV valve (no codes). Any advice is appreciated.

Mike

 

Can I ask what a fair amount is and/or did you take a picture?

 

Yes, it's usually a clogged pcv system, allowing crank gasses to back-flow into the TB.

 

Sorry but I thought that was the point of the [PCV POSITIVE CRANKCASE VENTILATION] a clogged one will only stop this.

They tend to get a little dirty but if your finding oil..... You shouldn't.
Maybe some debris or gunk but not a liquid type oil.

 

Start by popping off your PCV hose off and cleaning it out with carb-cleaner (really easy). I rinsed a bunch of debris and crud out of mine and was amazed at the difference it made once it was clean. While you're there you can check your oil seperator, it may be completely clogged as well. There is a thread regarding the oil separator and a cheap replacement (with a Brillo Pad I think).

 

In a correctly-functioning system, air flows only one direction, from the TB, through the driver's side valve cover, then out the passengers side valve cover into the plenum. It should NOT back-flow through the drivers side, where there is no oil seperator, hense an oily mess. A clogged oil seperator and/or hose on the plenum side usually causes this.


But yes, follow ylodisco's advise, that is more than likely it.

 

If the oil separator is missing it will suck in oil.

 

But the oil seperator is on the plenum side, if it were missing it would suck oil into the plenum, not the throttle body.

For oil to make it into the TB, the air has to be flowing in reverse

 

Well fine then!!

You are right and I am wrong, you make a very valid point.

 

just wondering,

what controlls the way it flows? I don't see how it could possibly do that.

If you ever removed the drivers side pcv hose its obvious air is coming out of it. Maybe because its unhooked [doubt it] but what in the world makes it circulate?