This never stops . Changed fuel pump 2 water pumps all the injectors and sparks , my car shakes moderately when I start it , now it starts shaking heavily when I just start the car . When I put it to drive and let it roll it shakes so heavily that I stop turn the car off , turn it back on and only then I could drive . A week ago it happen and the check engine light turned on I turned off the car and it never reappeared . I got used to the slight shake and smell of exhaust smoke when I start it but the heavy shaking makes me feel something bad is about to happen . Anyone has any input . The car feels very flimsy also
Thanks for helping .

 

It would help if you had the check engine codes read (or posted), otherwise everyone is just guessing.

 

Without proper diagnostics (codes) you could go on and on and on replacing part after part until (by accident) you replace something that has actually failed.

 

checengine sign dissapeared. all the parts i mentioned were replaced by bmw in the past two years

 

Doesn't matter if the CEL is off, codes are stored until someone clears them. Get a DCAN cable or have a qualified shop read the codes. Otherwise you'll find this thread will die pretty quickly.

 

How many miles? Probably carbon buildup on your intake valves and no, fuel additive or seafoam will not fix it. Manual cleaning with walnut shells is the only method...

 

Autozone might even be able to read some codes for you. Otherwise get a good reader. If the issues are related or failed previous repairs and its under two years BMW will cover. Better hurry and find out.

 

did you get any news???

similar problem...

i just changed all the coils and sparks as per my codes...

still the light shaking in the beginning with NO CODES to show anything.. I'm told that a new batch of injectors are out (2013) for the n54 and that my (excuse my memory)"exhaust valves" are bad...

with no codes all of this is guessing and very pricey...

also i did an oil change at the same time and it came out black and old looking, funny thing is i changed the oil only 7 weeks prior and have only done light city driving in this damn cold city of Montreal Canada.


any help out there??

Thank you.

 

I would check for any carbon buildup if you have miles on the engine. Could be the injectors, but the shaking could be resultant of the car not breathing well from the carbon deposits on the intake valves. A quick peek into your intake with a boroscope could verify this.
The oil is supposed to be black if it's doing it's job. The oil is suspending contaminants that would otherwise be on your engine parts, plus your car is turbocharged so its much harder on the oil.