v12 vacuum leak? - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 08-17-2004, 09:47 PM
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v12 BMW is an unknown quantity at this point
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I need help, this is my first BMW, I bought a 1998 750il.

I have had it for a year now awesome machine, the warranty just ran out in May.

I started it up today to go to work and heard a hissing noise. I opened the hood and located on this RHS (passenger) what seems to be a vacuum leak from the rear of the intake. There is a plastic end cap with four star type screws holding it on. When I put my hand over it, the sound changes?

Is this common, any ideas on what I can do to repair this short of a trip to the dealer?

Oh, when I pull the oil dipstick, the pressure bleeds down, kind of like pulling the hose off a vacuum booster, is it safe to drive?

Please help.
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#2 (permalink) Old 09-14-2004, 08:02 PM
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Mikebuk is an unknown quantity at this point

The plastic end cap on the manifold uses a simple o-ring as a seal (P/N 11 15 1 736 471). It's a simple job to do, just remove the plastic cap, replace the o-ring and refit the cap. As for the dipstick/pressure problem ...... I'm not quite sure what you mean by this. Please post more info.
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#3 (permalink) Old 09-14-2004, 10:04 PM
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Bear is an unknown quantity at this point
Am not familiar with the E38 750, but on my 1988 750 there are PCV valves that come off of the valve covers (at front of the engine and down low beneth the rubber boots) and run to the rubber boot connecting the DKWs (throttle bodies). Thes are a combination of plastic connectors and rubber hoses and if they get clogged they can overpressure the oiling system and cause back pressure in the oil filler or dip stick areas
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#4 (permalink) Old 03-20-2009, 11:58 AM
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apostollic is on a distinguished road
Do you have a part number for the cap...and why is there a cap on the rear of these manifolds
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