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Discussion Starter #21
There should be no crankcase pressure at idle by the way,
Agreed that there should be no crankcase pressure due to the manifold vacuum at idle, that is to say that the PCV is working correctly, which the old one wasn't, so the pressure built up and went out the easiest path, the dipstick connector.

it would have been sucking air through the failed dipstick tube seal
Wouldn't it be sucking air through the inlet that is before the throttle butterfly?

What did you use to replace the PCV

I used a aftermarket one called Fuelmiser 020.
 

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A PCV doesn't really 'meter' or control the quantity of gasses as they pass through it. They are just one way valves fitted to prevent a pressurised 'backfire' in the inlet manifold / plenum from also affecting the crankcase. It is not good if ignited gas enters the crankcase, where it could possibly encounter volatile fumes with enough free O2 to go 'bang'. It has happened...

Regards,
John.
 

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Discussion Starter #25
Cheers John, I read your detailed description on another post which helped me understand the workings.
 
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