My 535 Surging at 90 kph or more

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Damien - 14 May 2006 14:36 GMT

I have a 1989 535i that I have recently acquired and it has a few niggling
problems. The most annoying at the moment is that at speeds above approx 90
kph it feels like it is surging. Not so much as a miss but it feels it want
to rev higher and thus surging. (Sorry it isn't a competition to see how
many time I can say surging lol, but I cant think of a better term. Any
ideas as to the possible causes??
Thanks

Damien

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Enoch Root - 14 May 2006 15:15 GMT

> I have a 1989 535i that I have recently acquired and it has a few niggling
> problems. The most annoying at the moment is that at speeds above approx 90
[quoted text clipped - 5 lines]
>
> Damien

Assuming your intake manifold and head gasket seals are not
degraded(vacuum leak), I would say timing chain. Here is a list of what
you should be fixing and probably haven't yet:

http://www.bmwe34.net/e34main/trouble/what_will_break.htm

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John Burns - 15 May 2006 11:11 GMT

> I have a 1989 535i that I have recently acquired and it has a few niggling
> problems. The most annoying at the moment is that at speeds above approx 90
> kph it feels like it is surging. Not so much as a miss but it feels it want
> to rev higher and thus surging. (Sorry it isn't a competition to see how
> many time I can say surging lol, but I cant think of a better term. Any
> ideas as to the possible causes??

Ours had a something similar due to a failing fuel pump.

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Richard Sexton - 15 May 2006 21:54 GMT

>> I have a 1989 535i that I have recently acquired and it has a few niggling
>> problems. The most annoying at the moment is that at speeds above approx 90
[quoted text clipped - 4 lines]
>
>Ours had a something similar due to a failing fuel pump.

I'll see you and raise you. Failed in-tank pump, failing rear pump.
It endd up taking out the fuse contacts for the fuel pump fuse before
Einstein here figured out what was going on.

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