I have a 97 bmw 740I when start the motor blue smoke coming out as soon as motor gets warmer it goes away some one told me is a valve by the side of the engine need to be replaced

Asked by mehrannejad Mar 11, 2015 at 04:05 PM about the 1997 BMW 7 Series 740i RWD

Question type: Maintenance & Repair

Is about one month the blue smoke
is gone but sometimes is
happening again

1 Answer

GuruTMF1T answered 6 years ago

Well my best guess is that the heads need to be rebuilt i recently am having the same problem with the 1998 bmw 740i 4.4l, i smoke tested it and it does have a intake gasket leak so by sending the heads off to be rebuilt i will be replacing those as well, i am a certified tech and i get no codes besides misfires from the intake leak, nothing for the dohc sensors. When it does happen in mine i do hear valve chatter and it even does it after idling for a while and then taking off. So now i just need to save up get a side car and begin tearing apart the motor

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