My 535 Surging at 90 kph or more

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

On Sun, 14 May 2006 23:36:23 +1000, Damien wrote:

> 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

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/troubl...will_break.htm

> 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.

--
Who needs a life when you've got Unix? :-)
Email: , John G.Burns B.Eng, Bonny Scotland
Web : http://www.unixnerd.demon.co.uk - The Ultimate BMW Homepage!
Need Sun or HP Unix kit? http://www.unixnerd.demon.co.uk/unix.html
www.Strathspey.co.uk - Quality Binoculars at a Sensible price

In article >,
John Burns > wrote:
>> 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.

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.

--
Need Mercedes parts? http://parts.mbz.org
Richard Sexton | Mercedes stuff: http://mbz.org
1970 280SE, 72 280SE | Home pages: http://rs79.vrx.net
633CSi 250SE/C 300SD | http://aquaria.net http://killi.net