BMW Repair Questions? Ask a Mechanic for Answers ASAP
My name is XXXXX XXXXX I will do my best to help you with this.
Can you provide me with the last seven digits of the VIN number?
Thank you for the VIN. It was helpful as it enabled me to look up the parts listing for you.
When a BMW fails like this with high crankcase vacuum it is due to the crankcase vent valve failing. You will need to replace this valve and associated hoses to correct the excessive vacuum. When this occurs you often get the noise you are describing. The best test is to try and open the filler cap and you find it is under excessive vacuum.
Here is the parts listing for you:
Components 1 and 3.
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Thank you will try this
This is a very common failure I have seen on all BMW engines.
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