5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
I just had a replacement engine fitted(47k miles), my 140k one fell victim to the swirl flap problem that doesnt exist according to BMW.
When running at say 30mph and I put my foot down it goes great, really quiet too, and the mpg is superb, 42mpg at 70mph, measured over 50 miles.
Problem is when I am setting off, it makes a nasty rattle and will not pick up speed, unless I floor it. this especially on a hill, better on the flat.
I can press accelerator and nothing happens, not even fuel usage guage, but if I,m in neutral I can press pedal and it revs sweetly. I did think of pedal potentiometer at first.
I swapped the pressure controller and long vacuum hose, also replaced maf but secondhand one.
Any thoughts or suggestions please, this one has been de-flapped by the way.
Thanks, I have had a read by an indy, there were no error codes, there was earlier an error code relating to Boost Controller, the only thing I could find was a boost pressure controller. It has 2 vacuum pipes, replaced those too. The code was cleared after that.
Some people mention that the vanos unit could be to blame.
I also read that it could be the ecu, doesnt that advance and retard the timing, wouldnt that make it rattle, also I had it remapped in the early days, now with a replacement engine it could possibly need re-mapping, just dont want to fork out another £250
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