EGR valve testing - am I doing it right? - PeachParts Mercedes-Benz Forum

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EGR valve testing - am I doing it right?

11-04-2011, 10:49 PM

d.delano

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Join Date: May 2004

Location: DC

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EGR valve testing - am I doing it right?

I'm hooking a MityVac up to the EGR valve on an M103 six cylinder. I'm seeing the shaft inside moving up as I pump the handle, pulls about 5 on the gauge, then slowly slips back down again. Is the valve good or bad?

Everything I've read says if it doesn't HOLD vacuum, it's bad. However, common sense tells me it's bad if it won't even actuate. It seems to be actuating fine, it just slips back down.

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