E34 520i engine surging

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   Hi
Is it normal when the oil filler cap is removed for the engine revs to surge up and down? Normally when i remove a filler cap on previous cars  the engine speed doesn't change. Also with the cap in place, when i removed a pipe at the back of the rocker cover ( to the inlet manifold) the engine cut out. This was just an investigative move only, no ther reason to remove it.
Any ideas.
You've probably realised am new to the BMW scene, but picked the car up Very cheap and wouldn't have anything else now. Says something when a 'F' reg BMW with 158000 drives nicer than my previous 'P' Xantia with 60000miles, same engine size.

nick

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nick mcd Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 05-August-2004 Location: United Kingdom Status: Offline Points: 5	Topic: E34 520i engine surging Posted: 23-August-2004 at 18:20
	Hi Is it normal when the oil filler cap is removed for the engine revs to surge up and down? Normally when i remove a filler cap on previous cars the engine speed doesn't change. Also with the cap in place, when i removed a pipe at the back of the rocker cover ( to the inlet manifold) the engine cut out. This was just an investigative move only, no ther reason to remove it. Any ideas. You've probably realised am new to the BMW scene, but picked the car up Very cheap and wouldn't have anything else now. Says something when a 'F' reg BMW with 158000 drives nicer than my previous 'P' Xantia with 60000miles, same engine size. nick

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b8alk Members Profile Send Private Message Find Members Posts Add to Buddy List Banned User Andy K Joined: 15-May-2004 Location: United Kingdom Status: Offline Points: 874	Posted: 23-August-2004 at 19:04
	yes your losing pressure so the engine will surge.

nick mcd Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 05-August-2004 Location: United Kingdom Status: Offline Points: 5	Posted: 23-August-2004 at 22:00
	Is that normal though or is there an underlying problem?