Question about 1994 Buick Century

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HOW TO CLEAN '94 BUICK CENTURY 3.1 EGR VALVE ..I BOUGHT THE CAR WITH 40,000 MILES (12/2006) .. IT'S 06/20/2009 WITH UNDER 62,000 MILES .. ABOUT 3 MONTHS AGO MY PROBLEM BEGAN .. THE PROBLEM IS A STRONGE CRANK WITH NO COMBUSTION .. I CHANGED PLUGS,WIRE SET, PCV,AIR CLEANER , & FUEL FILTER .. I ENGINE LIGHT CAME ON . THE CODE DISPLAYED P1403-STICKING EGR VALUE .. THE CAR STARTS W/ UP TO 3 ATTEMPTS .. IF IT DOESN'T START AS NORMAL (WITHIN 1ST. CRANK -1-2 SECS) , I TRY SHORT BURSTS @ START .. ALWAYS STARTS WITHIN 3 CRANKS @ 4-6 SECS.)

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To properly clean and test the egr valve you should remove it from the car. disconnect vacuum, elect connectors, and check the gasket surface both on the manifold and on the base of the valve. you will need to buy or cut a new gasket most likely. when you apply vacuum to the control inlet, you should see the valve lift away from the seat. I use brake cleaner and compressed air to spray clean and blow out the valve just to test it and then go from there depending on what you find ---- one of the vacuum switches that controls it or a faulty vacuum line is a likely possibility also ---- so you should check them also. a vacuum pistol comes on really helpful here.

Posted on Jun 20, 2009

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I have buick 2003 century 3.1L it started running weird and losing power up hills and seemed like it wouldnt shift right and had poor gas mileage. The check engine light came on once briefly. Scanned it...


Check EGR valve to make sure their isn't a piece of carbon stuck under valve seat. Also you need to check exhaust back pressure to make sure you don't have a converter pluged.

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1 Answer

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1 Answer

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1 Answer

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1 Answer

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If your car runs bad with an EGR code then I would suggest that the EGR valve be replaced. I would like to know what code was set on your computer. It would help greatly. When the EGR malfunctions, you will have rough idle and possible stalling. If you have a code indicating EGR it may also condem the cat converter.Please show any codes that are set. Thanks Moe

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1 Answer

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