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Vacuum leak
Posted by David Ingram (more from David Ingram) on Tue, 19 Aug 2008 10:43:44
In Reply to: Saab Story part 2 94 9000CS 2.3, JoeinKnoxville, Mon, 18 Aug 2008 09:57:35
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I have long since lost track of what the various CEL flashes mean in terms of fault codes. Your mention of the O2 sensor suggests, I guess, that your research points to that little gremlin?
If so, know that very often the cause of O2 sensor CELs (and a host of others) is a vacuum leak someplace. Many leaks are intermittent, or their effects are, so CELs may come and go.
I would start by checking all your vacuum lines, make sure the rubber boot is secure on the intake, verify that the EVAP canister is connected and the valve working properly. The EVAP canister and valve are located inside the splash guard of the starboard side wheel well. That's right side to you landlubbers.
You should also heed the advice of the sage Ari, and verify that your plugs are gapped correctly. Wacky things happen with plugs that are out of gap, or old.
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