1990 Buick Regal regal

1990 BUICK REGAL
2.0L • V6 • 2WD • AUTOMATIC
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DREWZYWOOZY
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1990 Buick Regal Will Not pass smog. The guy at the smog shop is saying that everything is ok but the EGR valve is not working. Diagnose where it is and how to replace it.
Sep 24, 2014 at 10:23 PM
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CARADIODOC
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You have the wrong engine size listed. Your best bet, if you want to spend less money by doing it yourself instead of going to the repair shop, is to get a copy of the manufacturer's service manual. It will show where the valve is on your engine and how to test its operation.

The fact the EGR valve isn't working doesn't mean it's bad or it's the cause of the problem. Carbon could be blocking the ports so no exhaust gas can get through. A chip of carbon can be stuck on the valve's seat preventing it from closing. The vacuum hose going to it could have a leak or someone could have disconnected it.

The valve will be shown on the vacuum hose routing diagram under the hood.
Sep 24, 2014 at 10:37 PM