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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 01-30-2004, 08:55 AM   #1 (permalink)
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just joined and used search but cant get an answer.

i a going to buy a 318is (my first BM) this evening. cant wait.

one thing i dont understand is this.

when i remove the oil filler cap the engine rpm drops a lot and it nearly stalls.

similar but not as extreme when i remove the dip stick?

any ideas?

appreciate it

John
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Old 01-30-2004, 12:13 PM   #2 (permalink)
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not a garantee but apparantly from someone in the know because of something to do with the oil system on the bm its better that the revs drop when you remove oil filler or dipstick shows there isnt a seal problem hopefully this is the truth

cheers jas
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Old 01-30-2004, 12:29 PM   #3 (permalink)
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This is normal. The engine is under a vacuum when it is running and by opening the system, taking the oil cap off or the dipstick out, you are introducing alot of air into the system. It is similar to having a massive vacuum leak. One of the techs chime in if I am wrong.
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Old 01-30-2004, 01:24 PM   #4 (permalink)
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Yep, i have that car... the Whole Engine is on a Vacuum System, if u remove just one cap, it will change the entire reving of the car!!!

hope this helps!

(yes its completely normal, to answer ur question!)
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Old 01-30-2004, 01:36 PM   #5 (permalink)
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pretty normal... unless it squirts oil everywhere when you take it off
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Old 01-30-2004, 05:55 PM   #6 (permalink)
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thanks guys, glad to have added the 3rd German car to the stable
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Old 01-30-2004, 09:19 PM   #7 (permalink)
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Yeah, it's normal. Ever heard of the PCV system? Basically, it pulls the crankcase vapors into the intake manifold, and reburns them. By opening he cap, you let a lot of oxygenated air into the system, making it run lean.
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