EGR valve How do I test and Replace it L98 engine
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Re: EGR valve How do I test and Replace it L98 engine
remove upper plenum by undoing the bolts on the upper parts of both intake runners, unbolt the 2 7/16 screws holding the egr down, remove it. Olug the vacuum port end with your finger, then push up on the diaphragm on the underside of the valve. if it moves with your finger plugging off the port, its bad, it should hold the vacuum. If it doesnt move at all with your finger plugging it, its good. But watch out, it may move ever so slightly it will be hard to notice.
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