Question about 1998 Mercury Mystique
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Posted on Jan 02, 2017
Here are some pictures showing where the pcv valve is located on the 2000 Mercury Mystique, 4 cylinder.
First we see the engine compartment:
Next we will see a closeup of the area circled in red.
here I have outlined the PCV valve in red and the thermostat housing is circled in green. The pipe connected to the PCV is rigid metal. It is screwed to the motor, so you must remove the screw before you can pull on the pipe in order to extract the PCV valve. The screw is located underneath the thermostat housing, so the housing must be removed in order to get at the screw.
The head of the screw is inside the orange circle. I had to use a torx bit. Yours may be a phillips head. Here are a couple of closeups:
After I replaced the valve, my car was still surging at stoplights, so I started doing more troubleshooting. Lying under the car, looking at the side of the engine closest to the firewall, I saw a hole in a rubber tube. I crawled out and located this hose. If you follow the metal tube that the PCV valve is held in, you will find that it is inserted into a rubber hose after you get past the thermostat housing and it continues on to the back side of the engine. It turns out that this is the hose that I observed while lying on my back under the car. Apparently there is a bend in the hose and at that bend it fails due to heat buildup. Oh, well.
When I went to the dealer, his 2000 Mystique diagrams did not show this part, but he made a guess and it was the right part. Make sure and take the one from your car to the dealership for comparison. After replacing the piece of hose, the car runs perfectly :) .
Posted on May 21, 2011
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