Quote:
Originally Posted by Gurjit
The crankace only has so much vacuum, once it creats a vacuum in the crankcase thats it, air isnt being created inside the engine so it just holds a vacuum in the crank and now the mass airflow sensor can work effectivly on the intaked air from the filter, thats what causes your engine to trip out with thr dipstick pulled
No seal leaks is the key
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The crankcase struggles to maintain vacuum due to piston blowby (air created inside the engine). This is why it is critical to maintain a adequate vacuum supply to the manifold side of the CCV diaphragm. I've removed the CCV caps, installed a retention bar in it's place and watched the diaphragms while the engine is running. It's no wonder the rubber cracks - they're constantly moving up & down.
I find cold weather/moisture (rain) issues on intake systems all the time usually related to dirty air filters (especially on diesels).
If your engine trips out when your dipstick is pulled, it probably doesn't have adequate vacuum to close the diaphragms.
Keep in mind - I'm referring to my V8 N62TU