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The value of your boost can go down as well as up >
Posted by Bill Davies [Email] (more from Bill Davies) on Wed, 16 Feb 2011 00:47:31
In Reply to: Strange boost..., SMP, Tue, 15 Feb 2011 10:00:09
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As Derf points out, under certain circumstances the gauge will see vacuum rather than boost, such as when you're going downhill on a light throttle. And the behaviour of the gauge when accelerating sounds typical, too - the BPC will trim the boost back for various reasons, including fuel quality and plug condition. Anyway, mine acts pretty much like yours, by the sound of it.
The little hose going into the false firewall is in fact the line to the dash gauge - the other leg runs to the turbo bypass valve and it sounds as thoughyou've replaced this already, which is good because it can degrade, usually near where it's attached to the valve itself, probably because of heat.
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