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Tracing down vacuum leak 850

posted by  Ken Temkin on  Tue Aug 29 07:13 CST 2006
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last visit: Wed Oct 22 12:06 CST 2014
[RELATED]

Testing the secondary air injection system (SAS) on my '96 N/A 855.

The valve that sits on top of the exhaust manifold is controlled by vacuum with an electrically-operated solenoid mounted on the upper edge of the raditor shroud.

That vacuum solenoid pulls vacuum from a port on the intake manifold.

If I take the solenoid out of the car, and it is not energized, shouldn't I be able to pull a vacuum on either port of the solenoid?

Mine does not hold vacuum which, I think, is creating an un-metered vacuum leak, and causing my check engine light to come on with a failure code pointing to the SAS system.

Also, in the line between the intake manifold and this vacuum solenoid is a small check valve. Is this a one-way valve? If so, shouldn't I be able to pull vacuum from at least one side of this valve? Mine is free-flowing in both directions.

Any thoughts guys?






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