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:
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.
Have something to add? Share your thoughts — no account required.
Ask the community — no account required