1980 cutlass supreme 305.2 5.0 emissions smog diagram that fits

Asked by Jan 06, 2017 at 03:43 PM

Question type: Maintenance & Repair

So I'm trying to get my car smog but I can
not find a true vacuum diagram for it my
thermostat housing has two holes one is a
electric hook up temp sensor I'm thinking
the other has two vacuum ports?? Does
anyone have an idea  where these
would hook to. I can't even find a photo of
the housing with two holes. Thanx James

2 Answers


You'll need a factory shop manual. I'm assuming that the emissions decal under the hood is gone? You can browse eBay for the manual or check Faxon Auto Literature in Riverside, California. They have a website. I believe the two vacuum hose sensor is for the EGR valve. It should be hooked up to carburetor vacuum. The electrical connector sensor is for the gauge on the dash, or temperature light. Whichever one you have. HTH. -Jim


What state are you in? Some states don' require old cars like yours to pass smog inspection.

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