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  #41  
Old 06-29-2018, 03:18 PM
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Digging up an old thread here but just wanted to share my experience for others:

New to me 06 4.8is with 77k was producing white smoke after extended idle (~ 5 min or so). Of course I assumed it was the dreaded valve stem seals.

Anyways, after reading this thread I pulled the engine covers and investigated my CCV system. Found that the diaphragm on the right side had a tear and the breather hose on the left side cracked open. The PO (or their mechanic) choose to repair both with Duct tape!

Ordered new hoses and 2 CCV valves for both banks and cleaned inside the housings. Reinstalled everything and my smoke is gone!!! I expect oil consumption to improve (although I need to address small seep at top of upper time chain cover next).

Many thanks for this post! $60 in DIY replacement parts sure beats a valve stem job!!
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  #42  
Old 06-29-2018, 06:22 PM
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Congratulations on your victory over poor maintenance! Now we have proof that duct tape isnít suitable for CCV systems. And congratulations on your new 4.8is. Youíll love it!
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  #43  
Old 10-05-2018, 12:50 PM
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Quote:
Originally Posted by stiubhartach View Post
Think I have answered most of the questions, but I will be glad to elaborate if anyone needs more info. So to recap, if you have this issue, this is what I would do.

1) buy two new diaphragms with caps. You will break the caps getting them off.

2) remove the old ones and discard. A torn diaphragm will cause this problem too.

3 clean out all the gunk with carb cleaner. Try not to let it run down into the engine. It's not the end of the world though as its volatile and will evaporate out quickly while driving.

4)Make sure that the drain passage is draining. You can pour a little oil into it and see if it goes down. A pipe cleaner might be helpful.

5) clean out the hose that goes to the intake manifold. The fitting is a handy squeeze clip thing.

6) Reassemble. There is a vacuum nipple on the cap that goes no where. It was confusing to me.

7) I emphatically do NOT recommend ever using any stop leak or oil additive products in a tight tolerance engine like this one. The sealing components tend to gum up the important stuff I use only synthetic oil. I like Mobile One 0-40, but there are many good ones.

8) synthetic oil has amazing performance, but will find every possible leak point. That's just going to happen. But an oil leak doesnt hurt anything, other than your driveway. They are usually not worth fixing. They get fixed eventually during a serious repair.

Thanks for the good response to my post. Please report back if this works for you so that other owners can benefit from the feedback. Photos are always good too.
Is there supposed to be a hose connected to the CCV cap on a 2005 4.4i? The picture from pelican shows one (not where the arrow is) but it isn't like that on my car.

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  #44  
Old 10-05-2018, 01:09 PM
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>Is there supposed to be a hose connected to the CCV cap on a 2005 4.4i? The picture from pelican shows one (not where the arrow is) but it isn't like that on my car.

My 2005 4.4i didnít have one. The nipple on the cap is actually missing.

You can do research on RealOEM to determine when the change occurred.

RealOEM.com - Online BMW Parts Catalog
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  #45  
Old 10-05-2018, 02:12 PM
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Quote:
Originally Posted by stiubhartach View Post
>Is there supposed to be a hose connected to the CCV cap on a 2005 4.4i? The picture from pelican shows one (not where the arrow is) but it isn't like that on my car.

My 2005 4.4i didnít have one. The nipple on the cap is actually missing.

You can do research on RealOEM to determine when the change occurred.

RealOEM.com - Online BMW Parts Catalog
Strangely enough, my caps have the nipple. And coincidentally my build date is one day after yours!

Would torn diaphragms cause rough idle and stalling? This is actually the problem I was chasing when I noticed they were torn. New ones are on the way.
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Last edited by JokerElite; 10-05-2018 at 04:50 PM.
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