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850 idle erratic 850

posted by  KlausC on  Sat Aug 21 15:18 CST 2010
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last visit: Fri Oct 24 10:15 CST 2014
[RELATED]

There is no vacuum motor (except for the cruise control), all of the vacuum is produced by the pistons sucking in air.

My first thought was a leaky fuel pressure regulator. Any fuel leaking into the manifold after shut down will cause the engine to rev higher at start up. Depending on the year, the vacuum line from the FPR usually ends at the vacuum tree above the throttle body. BTW, have you cleaned the throttle body?

Sometimes, it take a while for the computer to realize that the EGR has been cleaned. A couple of weeks can be required for the computer to adjust.

If your car is a non-turbo, clean and check the PCV and the small line for blockage. A blocked PCV is the worst thing for oil leaks.

Klaus
--
Two great Volvos, a 1967 220 and a 1998 V70R






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