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EGR Vacuum controller valve diagnostics? 700 1989

posted by  2Saabs on  Sun Dec 18 05:06 CST 2005
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Hello All,
I bought an '89 740 GL for my daughter, and was experiementing with the EGR vacuum controller valve yesterday (with a vacuum tester). The upper port on the controller valve (white hose - intake manifold to controller valve) will hold vacuum; the lower port (yellow hose from controller valve to EGR valve) will not hold a vacuum. This was tested directly at the controller valve nipples. It seems the lower chamber vents to the atmosphere (or leaks.) Shouldn't the lower chamber also be able to hold a vacuum? Haven't tried checking to see if the valve clicks when the engine is running - was more concerned about how the valve operates. Anyone ever take one of these controller valves apart?






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New EGR Vacuum controller valve diagnostics? [700][1989]
posted by  2Saabs  on Sun Dec 18 05:06 CST 2005 >


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