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Old 06-03-2011, 12:31 PM
joej85 joej85 is offline
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Location: NC
Join Date: Sep 2008
Posts: 156
Mein Auto: 2004 745Li, 1989 735i
I am sure the pump has a flow spec, but I have no idea what it is. Its sort of like a vacuum cleaner operating in reverse, so I would expect quite a bit of airflow.

If the intake hose to the pump is blocked or partially blocked, the airflow would be restricted into the pump, so that would cause low airflow out of the pump. If you are getting codes for both sides, that could easily be the problem.
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