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Re: engine warning light on, bypass valve?
Posted by Steven Pfaff (more from Steven Pfaff) on Fri, 9 Oct 2009 00:38:04
In Reply to: engine warning light on, bypass valve?, tartanpixel, Tue, 6 Oct 2009 15:39:24
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The fluttering noise you're describing...; is it sort of a hoot/howl/air-horn type noise? This is what the bypass valve sounds like when it's failing. However, this shouldn't create enough of a vacuum leak to cause the check engine light to come on; that particular noise is caused by boost pressure overcoming the diaphragm within the valve. Although, I'm not that familiar with the T7 system, I know it uses an air mass meter, so without compensating for manifold absolute pressure, a small vacuum leak could potentially cause a lean condition. Was it a lean condition that triggered your check engine light?
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