Sounds odd to have part of the vent routed upstream of the MAF sensor, so this could be caused by a sudden over presuure during a cold start from either too high an oil level or bad oil filter pressure relief valve. Might also be the CCV system valve has jammed fully open.
Be careful cleaning the MAF as you should use a genuine OEM standard MAF sensor spray.
Cheap contact cleaner can be contaminated enough to make the sensor sticky.
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2003 V40 1.9TD Mods: Scratches, bent bumpers, raised REAR mats & internal mud guards.
SHELL ULTRA 5/40 & LIQUI MOLY CERATEC.
Everyone should DYOR (Do Your Own Research)
Last edited by skyship007; Dec 11th, 2017 at 00:11.
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