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Well, it's acting up (sticking open) again. This for a code W CPI 4.3 Vortec V-6. According to Haynes there were several types of EGR and the one for my code W is not what I am used to seeing. It's unusual, and unusually expensive.
Thanks to a tip in the excellent step-by-step procedure below I was able to confirm my diagnosis. I took a ratchet extension and banged on the EGR housing. The idle immediately settled down into its smooth old self.
Anyway, anyone with this motor might want to peruse the link below. Good info.... but I don't think the pictures will come up unless you register for the site. I was already a member.
I'm going to live with mine for awhile and see how it goes before springing for a new one.
http://www.s10forum.com/forum/f201/egr-replacement-how-to-18667/
Thanks to a tip in the excellent step-by-step procedure below I was able to confirm my diagnosis. I took a ratchet extension and banged on the EGR housing. The idle immediately settled down into its smooth old self.
Anyway, anyone with this motor might want to peruse the link below. Good info.... but I don't think the pictures will come up unless you register for the site. I was already a member.
I'm going to live with mine for awhile and see how it goes before springing for a new one.
http://www.s10forum.com/forum/f201/egr-replacement-how-to-18667/