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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
01-26-2005, 12:20 PM
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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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#2
01-28-2005, 08:11 AM
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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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#3
01-31-2005, 08:47 PM
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Thanks for the response al_r.
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