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7 Series - E38 (1995 - 2001)

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Old 03-08-2014, 07:56 PM
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Swank350 Swank350 is offline
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Location: maryville
Join Date: Mar 2014
Posts: 877
Mein Auto: 2001 bmw740i
Smoke at start up and studder

Ok when I start my car after it sits over night a puff of smoke comes out, also when I'm light on the gas peddle it want to stutter. On top of that when I'm going down the hwy in top gear the power dips a little followed by a grown. Any ideas??? 2001 740i

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Old 03-09-2014, 07:33 PM
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ebida3 ebida3 is offline
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Location: High Point, NC
Join Date: May 2010
Posts: 727
Mein Auto: 2001 740iL
If the OSV, oil separator valve diaphragm fails it will smoke upon start up. The OSV takes oil mist and returns it back the the engine. If the diaphragm had ruptured vacuum pulls the mist into the engine and it burns showing as smoke.

Please make a video of the groan.
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Old 03-10-2014, 05:01 AM
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rrtec rrtec is offline
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Location: TN 37174
Join Date: Sep 2008
Posts: 819
Mein Auto: 540i/6 4/99
SOunds like 2 issues..

1) Smoke- Ebida3 nailed it on the head. OSV failure.. (often you can replace just the diaphram) google search 10 minute OSV
2) Shudder- Dollars to donuts this is a transmission OD torque/ converter clutch lockup failure. I had this recently. I did a test and added "Dr. Tranny's Shudder Fixx" while I waited for a new filter and fluid to arrive so I could change the trans fluid, and like magic my shudder and associated groan and mild surging was gone.. Not even kidding.
2001 740il Sport- Needs maintenance.. Parts ordered..
2006 Volvo XC90- Kid Hauler
FC3S LS1/6Speed
1992 BMW K75s Cafe build
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Old 03-18-2014, 10:41 AM
injuhneer injuhneer is offline
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Location: Arizona
Join Date: Feb 2014
Posts: 105
Mein Auto: 740iL
It must be seasonal. My '98 did both of these.

The smoke was a one time event but maybe a warning from the engine. I'll have a look. Is the diaphragm available as a separate component?

The tranny shudder is new. I was planning to do a filter and fluid anyway. Maybe I'll toss a bit of the Shudder Fix in.

-Mike O

Last edited by injuhneer; 03-18-2014 at 10:43 AM.
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