Smoking Problem

[1987Driver]

I have a 1987 930 that starts up well (after new plugs, wires, cap, plugs and rotor) and idles around 1200 rpm. Once the engine warms up the idle slows to about 700 rpm.

There is no smoke while idling at 1200 rpm but once the engine slows to 700 rpm it tends to smoke a lite white smoke.

I have put a new O2 sensor and cylinder head temperature sensor on last week.

Any ideas?

[81 911 SC]

white smoke can be an indicator that the turbo is on its way out.