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post #5 of (permalink) Old 02-26-2002, 07:26 AM
JimmyZ
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Re: Another EGR valve question...(More info)

EGR's are funny things. They have internal passages that will bleed off vacuum, to the point that you might think they won't work. Useing a little hand vac. pump sometimes won't supply enough of a constant flow to keep valve open. See if you can watch the valve move on the vehicle. Also there are two kinds of EGR valves, positive and negative back pressure. This deals with the exhaust pressure present at the valve during the period when it's supposed to open. This exhaust pressure also has to do with the vacuum bleeding off. Now finding out if you have the right kind of replacement valve can be hard. Tomco emission products have good tech support. Good Luck.

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