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    Re: bmw 318 51 reg eng code n42 b20 Archived Message

    Posted by steve walker on March 4, 2008, 11:22 pm, in reply to "Re: bmw 318 51 reg eng code n42 b20"

    Hi Jamie , Did the running problem only show up after the service if so it may well be that the oil filler cap is not seating correctly and causing an air leak as these are on a twist / turn type holder that snaps onto the rocker cover and can quite easily not go back on correctly if you have had the cap off to remove the cover in order to change the plugs . If this is not the case also check the air filter box on the underside neat the poly v belt as there is an air box fitted to the air filter housing that can rub on the poly v belt if not correctly seated and cause an unmetered air leak as this box bypases the air mass meter . Good luck , Steve

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