1st Gen R53 Cooper S Most liked posts in thread: Front left vacuum line from air filter box

I do believe it Tees into the bypass valve line. So you'll need to remove the intake hose from the intake to the throttle body. Then just below the throttle body towards on the air box side of the TB should be the BPV. Check there.

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While you're at it, remove your intercooler boots and check your other vacuum lines. There's one coming off the intake manifold pointing towards the passenger side upper engine mount below the SC inlet horn. which routes to the fuel pressure regulator under the middle of the fuel rail. If your vacuum lines are falling off I would check this one to ensure its on properly as this can cause a lot of issues down the road. Poor mileage, lean and rich conditions. It's worth checking, your rubber hoses may be getting brittle. This line may actually be rubber on the connections then be hard plastic as it routes. It's been a while since I replaced mine with a silicone hose so I can't remember. Check it though if you can spare the time! I bought an oversized wall silicone hose which had the same internal diameter but brought the external diameter to half an inch so I could use a nice clamp to hold it on snug instead of zip ties like most do.

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Yes it does tee at the BPV. If you take the air box to throttle body hose off you should be able to see it. I disconnected mine and removed the solenoid valve at the air box (I blanked off the hole where it was mounted).

I did a pressure test recently and found the clamps at the BPV leaked pretty good. Put some worm drive clamps on.

 

I wonder does anyone make any aftermarket clips that fit into the supercharger inlet hose that adapt from the plastic hoses to allow a 3/8 barbed fitting so you can run rubber hoses? I'd love to get rid of those damn plastic hoses. They are so brittle. At 290k miles mine have been through far too many heat cycles.

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Tummi gummi has it covered.

I'm going to check my other lines also.

Check JEGS for the clips. They won't specify MINI but if you know the diameters of the lines you can probably find what you need.

 

Do they have push lock style adapters?

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