Cold Start Chirping - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 05-31-2005, 06:32 PM
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I have just bought a 2001 BMW 520i SE, was first used in Feb 2002, has 65000 miles, the main attraction was the interieur for my wife. There are two concerns I have:

(1) At cold start it has a slight chirping until the engine temperature remains in 50% of the blue zone, after about 50% of the blue zone is exceeded the chirping disappears and the engine sounds like normal. I never heard anything like this with my other cars.

(2) when the engine already well warmed up and I drive at low speeds so that the tyre noise is low and I can hear the engine again, I can hear a hardly audible but still present whooshing (low frequency whistling) with variable amplitude. First I thought I am just imagining it but my wife confirmed it. It is disturbing as I did not hear this with my other cars.

Given the price of the car I am concerned whether these sounds are normal?
I would be eager to know whether these are indicators of problems later to develop. Would be grateful for any comments.

Sandy
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#2 (permalink) Old 05-31-2005, 08:55 PM
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When engine is cold it is normal to hear the sound of the auxiliary air pump, but not for too long!

If What u described as chirping is in fact a hissing whooshing sounds think air/vacuum/pvc plate leaks.
Chirping as ticking can be injectors sound
Chirping as noise like in a rotating object sounds a pulley related etc....

I say more info. needed plus any check engine light for a code?
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