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)
This only happens when the car is cold. I get to about 2k rpm, and then it suddenly loses power, rpms drop to 1500 and then skyrocket to 2k again. It only happens when it's cold or when it hasen't been started in a day or two !
Anyone know what this could be. Spark plugs ok, air filter clean, oild changed every 3k miles... etc. nothing visibly wrong.
If you had a carberator on your car I would just about guarantee the accelerator pump in the carby was worn out,but I think you have fuel injection.It has to be fuel related, filter blockage,or your ignition timing needs adjusting.Have you ever had your ejectors serviced ? Ask someone with a timing lite to check your total advance.
Let us know how it turns out.
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