Are there accurate early signs of a failing CCV? (Burning oil smell concern)
So I recently started to have a brief smell of burnt oil inside the car. I researched for a couple of days and it seems that it's either:
1) The Valve Cover Gasket
2) The OFHG
3) The CCV
Before I go any further let me explain where I am at with each one of those choices and the reason for this thread.
Valve Cover Gasket
I understand it should be replaced around 80,000 miles or later. I have seen plenty of videos and I have a pretty good overall idea of what needs to be done. I wanted to see if there were signs of leaks, so I popped open the BMW engine covers and actually found everything to be very clean! The one place where I did not check was the spark plug housings but I will do that soon because I will replace the spark plugs anyways. But notwithstanding that area, every where I looked, it seemed clean without leaks.
As a preliminary matter let me say this: My gasket is leaking and I have confirmed this fact through many observations and sources.
I bought the gasket already and I have two washers for the VANOS but I probably won't get to do that for one or two months. So I understand that's one of the ways burnt oil smell can be getting inside and that may be what's happening.
Question: Does anyone know how exactly the oil gets burnt? Is it because oil gets to the exhaust? I am just having a tough time imagining oil getting that far back to be burnt especially given that the filter unit far away from hot equipment. I was hoping to get input on this
I read and watched plenty of material about this very well known problem. It is of a particular concern to me because it can get quite cold around here so I always try to keep the car in the garage and make sure that the car warms up to an operating temperature all the time.
But I read a couple of threads where users have suggested the possibility of early tell and signs that the CCV is going bad.
Question: Is this true? Are there any veracity to "early tells"? If so, what are the specifics of it. What the thread mentioned is two tells:
(1) The engine oil cap will be difficult to be removed, and when removed, there is a strong vacuum coming from the engine hole.
(2) Once the cap is removed, you can hear a flattering sound, like a duck (whatever that means)
I thought it'll be an interesting discussion given the constant failure of this component.
mine was the valve cover gasket when I smelled oil, it was dripping onto the exhaust manifold
Our VCG was visibly leaking but no burned oil smell yet. When the dealer replaced it under the CPO extended warranty, they also replaced the valvetronic gasket. Seems to me that if you plan to do it yourself, you should consider doing both as long as you're in there.
OFHG leaks I don't think will provide any clues to the nose.
The drips just accumulate on the plastic underbody shield until they reach a point where they find a hole in the plastic to drip on the ground.
If VCG leaks start at the rear half-moons it might be quite a time before any accumulation reaches where it can drip onto the exhaust manifold.
But being so close to the cabin air intake I would think the smell of (unburnt) oil might be noticeable before then.
For the Oil Separator I would just rely on how the underside of the oil filler cap looks, and checking the hoses for it when doing a OFHG - or anything involving serious removal of lower intake components.
I will be replacing the OFHG prob within the next two months or so, I just gotta find the time. What do you think about doing the OFHG and also replacing the CCV as well?
I figured since I'll be half way there, I might as well continue and get to it and replace it. That'll give me some peace of mind but I typically avoid trying to fix anything that is NOT broken....
I had that burning oil smell and it turned out to be a bad actuator gasket on our 07 X3 3.0si. I originally thought it was the vavle cover gasket, once I started removing everything I found out it was the actuator gasket.
Not sure if the 2004 has this though...
Here's the DIY thread I created for it:
Keep us posted!
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