BMW: 93' 740iL smoking at idle

My 740iL (Alusil block not Nikasil) will start puffing oil smoke if
you leave it sitting at idle. I have replaced the idle speed motor and
checked operation of throttle position sensor. There is a noticeable
vacuum on the crankcase - i.e. pull the dipstick out and you can
detect a sound and airflow. How much of this is typical? I am at a
loss other than oil ring problem or valve stem oil seals maybe? the
compression tested good 140 and up on all cylinders. Could the EML be
sending the wrong signal to idle control and not allowing enough air
past the throttle plate, forcing the engine to pull it from elsewhere?
Off idle the car runs STRONG. Any suggestions?

On 24 Aug 2003 08:40:25 -0700, net (Chigger) wrote:

Engineering wise it sounds like valve guide oil seals.

Remember there are 32 of them a 2 cylinder heads. Perhaps a valve job at the
same time?

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Hugh
 

Intelligence is not knowing the answer but knowing where and how to find it!

Hugh Gundersen
co.uk
co.uk
http://www.bognor-bill.co.uk
Bognor Regis, W.Sussex, England, UK

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