An integral part of the emissions system, the PVC valve lets the crank case breathe. This allows proper intake and exhaust flow, resulting in proper running and operation. Often split from underhood heat and age, this vents excess oil into the engine compartment. Replace it now.
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The rubber breather pipes used a number of BMW applications are prone to cracking. Over the years, the engine heat and weather can take their toll and either weaken or cause breaks in these hoses. Your engine begins to run much worse due to massive vacuum leaks.
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