1,6,7,8 - Series and Mini CooperGeneral Chat related to models that do not fit into particular categories above. Please try to put your discussion in more appropriate sections. This section does cover the 1 Series, MINI Cooper and 8-Series vehicles: BMW 830i, BMW 840Ci, BMW 850i, BMW 850Ci, BMW 850CSi, M8, Alpina B12, BMW CS Concept and others.
My 740il sometimes would blow smoke ( at least once a day ) specially after a few miles driving it. I would hear a rattle, then white smoke will come out of the exhaust. I have been using sae5-30 oil, Car runs execellent and smoooth has 245k miles.
The Rear Manfold Cover (aka OSV) on the M62 engine is a known weakness, although it is usually a puff of smoke on startup. You can test for a failed unit by starting the engine and then letting the idle settle, then pull the dipstick and listen for the idle to drop and then recover, and a slurping noise from the dipstick tube.
Thanks for the input. I bought the parts online and waiting for it. In the meantime, I noticed one of the rubber host attached to the manifold was bad. i changed it immediately and now I have less puff of smoke coming out and my check engine light went away.
after replacing the Crankcase vent ( rear intake Manifold ) I'm still getting part time smoke when starting in the morning, also when driving, it would hear a rattle sound then a puff of smoke.
The car runs great, idle is good. Any other ideas that might cause the part time smoke?
So its white smoke, it could be something to do with the transmission breather?
Can you tell where the rattle noise is coming from?
How long does the rattling noise last for?
Can you force the noise to happen?
Will it only happen after a short period from take off?
It would rattle under the car for a short period, then smoke would comeout on the tail pipe. It's more constant when the car is still bit cold. when it's been running for more than 15mins, it doesn't blow smoke.
I have heard a rattle noise from my transmission on the first take off for the day when the transmssion is due for a service (not sure of the cause). The noise has disappeared each time I have had the oil and filter changed, but I hadn't noticed any smoke. Maybe get the transmssion serviced and have them check the breather line and related apparatus.
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