Re: More info? - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: More info?
Posted by MikeN [Email] (more from MikeN) on Thu, 14 Aug 2008 11:06:58
In Reply to: Re: More info?, Jeff Morreale, Thu, 14 Aug 2008 09:22:06
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Well, intermittent symptoms usually do not indicate a vacuum leak (leaks, of course, tend to continue until corrected), but at the same time, electrical problems usually trigger the CEL, which has not happened. It may be that one of the many valves plumbed into the vacuum system (turbo bypass valve, etc) could be malfunctioning and thus the symptoms only occur at a time when that valve is supposed to be opened or closed. I mention the turbo boost gauge because it measures manifold vacuum as well. At normal idle the gauge should point to the negative side of the neutral area. If the gauge goes to the neutral area (loses vacuum) when the symptoms occur, it's another indication that something in the vacuum lines is leaking or malfunctioning. Hopefully your check of all the hoses may reveal something.
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