If your are refering to the plenum being a large box say for air mixing the answer is no. you should have filter in return side however be sure you have access.
It is mounted on the Plenum.
yes
The IAC valve is mounted on the upper intake plenum (manifold)
The BDA is mounted to the top of the plenum between the plenum and the duct work just behind the glove box
Plenum rated cabling is required when used in an open ceiling return air environment. That is when the return air for the hvac units use the space between the ceiling of the first floor and the floor of the second floor as a return air plenum. The way to tell is if the return air vent has a duct attached to it. The duct will run to the air conditioning air handler. This condition IS NOT a plenum rated ceiling. However, if the return air vent does not have a duct, that means the air conditioning air handler is using the air space between floors as a plenum. This condition requires the use of plenum rated cabling. If plenum rated cable is exposed to flame, it does not give off toxic gases as it melts.
CPVC is safe for return air plenum use, but you should always check with the local codes and regulations adopted by your authority having jurisdiction.
Yes they can. It can only be used for low voltage transformers that have that 6-32 screw in or mounted for a receptacle for service equipment .. like a/c unit or any serviceable equipment but no cords plugs plugged in Thu or above the ceiling sorry .
ECM is located on drivers side, below the base of the windshield underneath the plenum. You have to remove plenum panel for access.
Follow the intake air plenum from the air filter. It connects to the carburetor. The carburetor is mounted on the intake manifold.
The IAC valve is mounted on the upper intake plenum (manifold)
under the upper plenum of the intake manifold it is round and is bolted to the fuel line and has a vaccum line attached to it. you need to remove the upper plenum to access it