BMW's 3-series models are all rear-wheel drive, with the exception of the X-drive all-wheel-drive model. There are no front-wheel drive BMW 320i models. The PCV valve and the vacuum pump are the most ...

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We don't mean to be the harbingers of doom, but it's unwise to keep driving if your car's engine has a malfunctioning positive crankcase ventilation (PCV) system, particularly a bad PCV valve.