Loud Vacuum noise from SL320

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Loud Vacuum noise from SL320

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10-21-2003, 05:37 PM

DR.DIESEL

Senior Member

Join Date: Mar 2003

Location: Puget Sound, Washington St.

Posts: 522

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Yes, that is the vac pump. It will run for 30-90 seconds every time you start your car and cycle off/on from time to time when driving. It is used to help heat the cataylist and o2 sensors up.
If it were acting up, the Check engine lamp would be on.
Dr.D

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