Question about 2001 BMW 5 Series

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About every 200 or so miles my 2001 525i BMW will run roughly then a big puff of smoke will come out the back then it runs fine for another 200 plus miles. It has done this 3 times.

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Most of these problems come from bad fuel try not to us generic fuel and never leave the fuel level go lower then 1/4 tank

Posted on Jun 29, 2009


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1988 v8 318 4x4 ram charger starts and runs rough then puffs white smoke out of throttle body and dies what could cause this

Have you checked youre water level? White smoke can indicate water. May be headgasket. I would also dble check valv clearances and timing for tge rough running. 180° out of timing may be the rough running too.Just go through top to bottom your work. could be wires not in correct position.

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Could be a coolant leak into the cylinder. (head gasket leak) use a five gas scanner to check for hydrocarbons in cooling system.

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I am experiencing problems with my BMW 320i - 2004 model. It does not start easily. When it starts, a blue fuel smoke comes from the exhaust. this causes the car also to be heavy on fuel consumptio

Blue smoke is caused by oil. Rich running causes black smoke and will set the check engine light. Rich running (black smoke) on startup could be caused by a leaking injector. The blue smoke puff at startup is likely valve stem seals leaking or a bad crank case vent malfunction and sucking oil into the manifold at high vacuum conditions.

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Puff of smoke from air vents.

You have a better idea than us, you saw and smelt the smoke.

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the one thing in your statment is the knockes/knocking this what is known as the big ends and indicates the engine is under pressure and needs a lot of repair.If when you start the engine when cold if you stand at the back of the car and if the smoke coming out of the exhaust has a blue tint/ie like a old ladys hair tint ,as im sure you will see.[bottom line] the engine needs replaced.adrian,,,,

Sep 02, 2011 | Buick LeSabre Cars & Trucks

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Oil filler cap creamy not overheating dipstick and water levels fine just started running of cylinder had been odd puffs of smoke

If the car is used mostly for short trips, a creamy oil cap is not unusual. Try to use this car for the occasional long trip to dry it out. The concern is that the oily sludge will fill up the tube that runs from the front corner of the valve cover down to the crankcase ventillation valve under the intake manifold. If that hose plugs up (typically only happens if the sludge freezes) the system can start sucking oil up through the oil drain from the crankcase ventilation valve and pumping it into the intake manifold. This problem is rare, usually seen only in 6 cyl BMW SUVs that are used for running errands in mountain communities and never really warm up, but it can happen if you have a lot of water/oil sludge buildup.
The rest of your problem statement is not completely clear. Missing a cylinder when cold is very common and may be caused by any one of several problems. If it smooths out after a minute or two, it is not a big concern. If the car misses on a cylinder after it is warm, check the age of your spark plugs, they should be replaced every 50k miles or so. Try pouring some fuel injector cleaner (Techron is the most popular) through it. A weak coil is also a possibility Early e46s had some coil problems, but I would expect that if you were going to have coil problems, they would have flared up long before now unless this is a really low mileage car..
The reference to odd puffs of smoke is a little unusual, but it is what reminded me of the possible problem with sludge plugging up the crankcase vent line. I suggest that you pull that line off the front of the valve cover and look inside. If it is full of sludge, get that system cleaned out.

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1989 chevy 350 automatic, white smoke

white smoke is antifreeze try checking the compression

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2002 525I Just after recent oil change I was sitting at a stop light, Light changed I gave the car gas and a big puff of white/blue smoke came out. It has done this ever since. The car has has 97,000 mi,...

Have you used the correct grade of oil for the engines mileage? If you add a can of Wynns Smoke Stop that will thicken it a bit and help to stop/reduce the emissions.

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