Blue smoke on extended idle. 2006 4.8is.

[craigatkinson]

I really do not think it is the PCV. I changed that on mine and it didn't make a lick of difference. I'm just wondering if there is anything else other than the valve seals that it could be. I'd much rather stay away from pulling my cams if I don't have to.

[mistasteppa]

I had the same problem and it was the value seals, I had them replaced over a year now and no problem since them

[Thorn]

I have the same problem. What can I expect to spend on replacing the valve seals ??

[goflyhelo]

I have 06 4.4i and I am having thise exact same issue with the oil consumption and white/blue smoke on long idle or very slow stop and go til I open up the trottle, it starts to smoke but then it's gone.

Any help on how to avoid the dealership on this fix would be highly appreciated!

[masurati]

I have a 07 4.8 x5 with 71k. Mine is doing exactly same. After idling for 5 minutes
It blows out white smoke once i rev it up and then It takes another 5 minutes and
Another rev for the smoke to show up. Smoke smells like a burnt tire.
I would be 100% sure i had leaking v seals if it was not for this one strange thing:
If i idle it with oil dipstick removed then it does not smoke anymore.
I changed ccv pipe and ccv valve membrane and it did not help.
Since it does not smoke with the dipstick removed i think its a ccv
Related issue and not leaking valve seals. What other ccv components
Can i change? Any ideas?
Thanks.

[Porschesolutions]

you're correct: a few of us have narrowed this odd occurrence to a leaking intake manifold seal(s). If the dipstick is removed (good logic to follow there), there's another air intake source for the leaking crank case to draw from.

Apparently if the intake is leaking, vacuum draws leaking oil (from the crank case) into the intake system where it apparently ponds over +20-30 seconds until you mash the gas & an influx of air sucks the oil into the combustion chamber resulting in the oil & smell.

Thicker oil will help reduce the oil being sucked into the intake and the reason this happens at idle is because vacuum is at it's highest and that air flow into the engine is at it's lowest. Punching it after idle drastically changes air volume into the engine which sucks the oil into the ports.

You need to spend a few hundred & have your intake manifold re-sealed (removed & replaced).

People spend thousands on having a valve job which also fixes the problem...why? Because you have to remove and reseal the intake as part of that process.

Mark

[Christiano]

Dude I'm really sorry to tell you that, but when my car had this problem, they change the entire engine (under extended warranty). I have the same car, 4.8is 2006. Unfortunately, the car has start to smoke like yours. There was high oil consuption. They (Dealer) rebuilt both heads with everything... but the problem was not solved. A month later, I return there with a huge noise and a spun bearing (Several damage. cause: ROD KNOCK.
Now the beast runs like a champ, but they took 60 days to repair, tests and delivery my car back.

If you really have time and money (and god bless you: an warranty), it's time to look the botton end IMO.

Really sorry for that, but maybe is not so simple like PCVs, seals...

Chris

[4.8isX5]

Christiano yours sounds like an out there case, most of the cars with the n62 engine ive read about its basically the seals.

[Christiano]

Originally Posted by 4.8isX5

Christiano yours sounds like an out there case, most of the cars with the n62 engine ive read about its basically the seals.

Maybe. I'm hoping it will be just that.
If only heads, after rebuilt, I would say to change the oil and filter and drive slow for 10 miles. Get back and change the oil/filter again. It's cheap than a new engine.

Chris

[craigatkinson]

I'm considering doing this project and making a video of the step by step process. I have found videos of parts of the process, but nothing from beginning to end.