To replace the intake plenum on a 2.5-liter Mercury Mystique, first disconnect the negative battery cable and remove any components obstructing access, such as the air intake and throttle body. Carefully detach the intake plenum by unbolting it from the engine and disconnecting any vacuum hoses, electrical connectors, and sensors. Clean the mating surfaces, install a new gasket, and then position the new plenum, securing it with the bolts. Finally, reattach all previously removed components, reconnect the battery, and start the engine to check for leaks.
The intake plenum is simply the top of the upper intake manifold, where the throttle body is attached. It is made of black plastic.
Pull off the upper intake plenum and you will have access to the plugs and wires.
very carefully
Behind the intake plenum.
You have to remove the intake plenum air chamber to get to the 3 plugs against the firewall. It requires to buy intake plenum gaskets and go ahead and replace the PCV hose on the back of the plenum. Need to get from the dealer. Gaskets also from dealer.
remove upper intake plenum
Which plenum-intake or. . . .
You have to remove the intake plenum. It just unbolts.
The PCV valve is located on the back side of the intake plenum.. When facing the engine, locate the second intake from your right. Run your hand to the back side of the intake plenum. The PCV valve is screwed into the backside. Start the engine, disconnect the hose from the valve. You should hear the air from the valve. Stick your finger on the hole and you should feel the vacuum on a good valve. If not, replace it.
The plenum is the intake manifold.
it is on the back valve cover, you can't see it unless you remove the intake plenum.
The intake plenum on most cars is bolted directly atop the intake manifold. This is where the air goes after passing through the throttle body.