Question about 1991 Oldsmobile Cutlass Calais
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Posted on Jan 02, 2017
EGR circuit malfunction. Your exhaust gas recirculation valve is not operating properly. The valve opens under certain conditions (mostly off idle) to recirculate exhaust gases back through the intake and through the cylinders, to lower combustion temperatures for cleaner emissions.
Often the valve itself, or the passages under it, get clogged with carbon build-up and cease operation. Take the valve off and clean it with a wire brush and maybe a small blade. If you push up on the valve's diaphragm, you should see the pintle on the bottom of the valve raise with the diaphragm. If it doesn't work right, replace the valve (a salvage unit should work). Also take the blade and clean out the passages of carbon. Clean them as best you can so the passages are not clogged up. Then put the valve back on with a new gasket, if needed.
Some people just do away with the egr valve when it stops operating, by taking off the vacuum line to it and plugging the vacuum line off. Then the valve cannot open. Sometimes the valve gets stuck open, resulting in the engine idling poorly.
Posted on Nov 30, 2012
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