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Discussion Starter · #1 ·
I'm pretty stumped here and would really appreciate any insight or information you guys have to offer on this.

I have a 11' 335is (N54) that's blowing white smoke under heavy acceleration. It does idle with the smoke after I've been running it hard, but it doesn't consistently do so, nor does it start up with smoke. The car runs fine, it doesn't idle roughly, stumble, nor does it have a MIL or any stored codes.

I've run a block test on it to check the head gasket, but the car passed. The tester fluid remained blue for several tests and minutes... Also the car isn't leaking coolant or any fluids for that matter. I've also done a fuel injector actuator test with a friend's Snap On tool and they all passed.

The car only has 35k miles on it so i'm hesitant to point fingers at the turbo's or seals, although I've seen forums where people have had problems with the seals this early on. I've also seen some talk of the CVV possibly being the culprit, but i'd like to be sure before throwing parts at the car.

I appreciate any inputs!
 

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I'm pretty stumped here and would really appreciate any insight or information you guys have to offer on this.

I have a 11' 335is (N54) that's blowing white smoke under heavy acceleration. It does idle with the smoke after I've been running it hard, but it doesn't consistently do so, nor does it start up with smoke. The car runs fine, it doesn't idle roughly, stumble, nor does it have a MIL or any stored codes.

I've run a block test on it to check the head gasket, but the car passed. The tester fluid remained blue for several tests and minutes... Also the car isn't leaking coolant or any fluids for that matter. I've also done a fuel injector actuator test with a friend's Snap On tool and they all passed.

The car only has 35k miles on it so i'm hesitant to point fingers at the turbo's or seals, although I've seen forums where people have had problems with the seals this early on. I've also seen some talk of the CVV possibly being the culprit, but i'd like to be sure before throwing parts at the car.

I appreciate any inputs!
My first thought would be it may be burning oil. Have you tried smelling the smoke? If so, what does it small like? I would monitor the oil and coolant levels. You might also want to have the coolant system pressure checked. Something like might be leaking and builds up then burns off, possibly why it doesn't happen all the time. I can say this is not a very common thing to hear about.
 

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Discussion Starter · #3 ·
I haven't been able to pick up a scent on the smoke since it only does it under acceleration... also I don't think it's burning oil since I haven't lost any oil at all. I did notice during the block test that the coolant reservoir would boil over sporadically which I thought was odd since the system wasn't pressurized (cap removed).
 
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