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Is there or should there be a filter screen under the PCV valve of a 1990 Mercury Grand Marquis with a 5.0 L engine?
Wiki User
∙ 18y ago
i have never run into a screen on the pcv valve at lest not that old of a 5.o I have the same car and there is a screen under the pcv. I have a 1988 Grand Marquis with the 302 engine. There is a metal mesh filter under the pcv valve. This filter is about 3/4 inch wide and 3/4 inch thick. To remove the filter, the large rubber grommet that the PCV valve sits in must first be pulled out of the engine block ( by hand). Then you can reach in and get a fingernail under one of three small tabs on the top of the filter and pull the filter out for cleaning. The PCV valve is located on the top of the engine block, at the back of the engine close to the fire wall, near the center of the block. All you can see of the factory installed PCV is a thin metal ring between the hose that connects to it and the grommet it sits in. I was able to remove and replace the PCV, grommet, and filter with my left hand while laying over the engine from the passenger side.
Wiki User
∙ 18y ago
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