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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E36 (1991 - 1999)

E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 01-26-2005, 12:20 PM
Xster Xster is offline
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Location: Biloxi
 
Join Date: Jan 2005
Posts: 2
Mein Auto: 97 328i
Noise at cold startup

There is a long "whizzing" noise coming from an "air pump" right next to the hood positive terminal for jumping on my 97 328i. The noise would last for approximately 2-3 minutes at cold startup then stop completely. What is that pump or whatever that is called? Any help would be greatly appreciated. Thanks,

John
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Old 01-28-2005, 08:11 AM
al_r al_r is offline
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Location: Chicagoland
 
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Mein Auto: '96 328i
That is your secondary air pump, 'injects' fresh air into the exhaust manifold at start up time till the ECU shuts it off - strictly emissions related. If the pump fails, you'll get a CEL/code indicating 'not enough volume' in the front or rear engine banks.
If you decide to replace it, also replace the valve it feeds on the exhaust manifold.
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Old 01-31-2005, 08:47 PM
Xster Xster is offline
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Location: Biloxi
 
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Mein Auto: 97 328i
Thanks for the response al_r.
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