SOURCE: 1998 BMW Z3 1.9 Cylinder
Spark plug wires may be the cause. for cold damp start issues water is a conducter and will send spark directly to an engine ground not through spark plugs. also look for oil in spark plug wells this can also cause a misfire under certain conditions.
SOURCE: BMW Z3 SPORTS CAR 1998
its the dreaded seat rock syndrome, plenty of fixes on the forums, basically you have to replace spacers in set drive mechanism. I did with the help of a friend after ordring bushes and it was quite easy.
SOURCE: 1998 BMW Z3 2.8 Idles rough when cold starting in wet weather
the problem could be in air mass flow sensor, but it's expensive
SOURCE: how to install rear shocks for 1998 bmw z3
They're not shocks they're struts. It requires spring compressors and air impact tools.
Unless you have them and the know how how to compress strut springs. don't do it. It can be dangerous.
It's why it's a lot of money to have it done.
SOURCE: replaced water pump in 2001 bmw z3 and now car won't start
I would suspect that you pulled a wire off when you were installing the water pump. Check to see if you have spark
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