rough cold start = air blowing out through oil cap? - Alfa Romeo Forum
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rough cold start = air blowing out through oil cap?

Hi guys,

Just did the normal jump start after having left my gtv cf2 2.0 in the cold for 31 days, outside, and as soon as the engine turned on heard a weird bang, as if something that was blocked had kind of snapped. Lots of white smoke through the back and front, later stopped, worse is that with the engine running I decided to open the oil cap, to check, not sure what, and found to my surprise that air is currently being blown through the oil cap, lots of air. The cap seems to be able to stop it. So much air is being blown out that oil immediately starts to be blown through the cap everywhere.
The car rides, holds revs well, doesn't seem to have lost power, although haven't pushed more than 60mph. Why should it be blowing air through the oil cap?
Any help would be great, will be getting it to garage in oxford tomorrow... again...
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Pretty sure all engines will blow air through an open oil filler due to crankcase pressure from the pistons decending. Oil will be flung out as there are moving parts in there.
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The bang might have been a misfire. it's likely if you had damp in the electrics..?

The air is crankcase pressure.. so don't worry. Just put the cap back on.. check that it all idles okay and warms up properly and quickly. I'd use some injector cleaner (or 200ml of kerosene in the tank) to clean things up in the fuel system... then put new petrol in there and take the beast for a long, gentle drive.

Check the thermostat works and put the heater on to dry it out a bit, if it's been outside.

Ralf S.

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