Chasing a slight oil puff - parts not available ?
 

Hi guys :)

Im chasing the elusive slight puff of smoke after extended idle when warm as usual and have read all the threads possible so have been heading down the correct route to begin with.

My CCV are both not split but slightly blocked by a quite hard brown subatance - ill be cleaning this out but how best to get it out the rest of the breather system ?

From looking past my throttle plate while holding it open the is slight browning and a hint of oil in there but its certainly not soaking wet - am I heading in the right direction ?

Ive got a small rubber pipe that comes off my air flow meter to throttle body pipe thats terribly corroded and cant hold vacuum so needs replacing - realoem just has it grayed out with no part number so not really sure what that means ? (Number 7 in this link)
RealOEM.com - Online BMW Parts Catalog

Ive also got my oil cap seal leaking so replacing that.

Other than that ive a few questions about what I SHOULD have went running at temprature :confused:

If I remove the CCV pipes should I have pressue at the cam cover port and vacuum at the inlet manifold port ?

Is there any test I can do to know I have the correct pressure and vacuum in the correct places ?

Many thanks guys :thumbup:

what engine are you running?

^from the realoem link it is a 4.8 N62.

Those like to puff from bad valve seals, hope it's not that.

That's why I asked. Let the car idle for ten minutes (if it's a V8) then floor it. If you get smoke it's likely bad valve guide seals.

It is indeed the 4.8.

Im pretty sure its not the valve seals as that would not get iol into the inlet manifold (it would just go straight into the combustion chamber).

What grade oil are you running? Changing oil grades has stopped my 4.8 smoking from extended idle.

Test it and see what happens.

Update on this - im prettuy sure it is stem seals even thoug hte breather system was poor too.

Ive got strong vacuum at the oil filler cap, inlet pipes, crank vent pipes etc and opening any of those areas when running causes a large change in idle speed and note for a second.

Time to get the covers off and order some tools from AGA !

If the CCV system is showing blockage to any level I suggest replacing all components. Not that expensive and that is best practice.

I think the hose you are talking about may be this one? There is no hose going to the MAF.

RealOEM.com - Online BMW Parts Catalog

I am aware you have a 4.8 rather than a 4.6.

Id be inclined to say I have more vac than I expected to have certainly makes the oil filler difficult to remove when running.

Thats the hose - I ordered some generic vac hose in the end as no where local seems to stock or supply anymore ?!

On the 4.8 it goes from just infront of the intake, along the inlet manifold and then over to the passenger side strut area (drivers side strut for mose on here as left hand drive) and then looks to go down to the chassis leg and vanish - im assuming there is a carbon canister or fuel tank breather down that way ?