A knocking noise in the plenum of a 2004 Chrysler Pacifica can be caused by several factors, including loose or damaged components within the intake manifold, vacuum leaks, or issues with the throttle body. It could also be related to a failing or improperly functioning EGR (Exhaust Gas Recirculation) valve. Additionally, engine misfires or problems with the ignition system could contribute to abnormal noises. A thorough inspection is recommended to pinpoint the exact cause.
You have to remove the intake plenum to access.
Plenum is another name for the upper intake manifold.
Just the plenum.
The rubber O-ring style can be if not damaged.
Under the coils, through the middle of the valve covers. Intake plenum will need removed to access.
on the drivers side of car on the center of the plenum its black
That is the top part of the engine. It is what the throttle body is bolted to.
It is called the egr tube.
You have to remove the upper intake plenum.
First of all you can get to the first 3 plugs very easily. The other three you have to take off the plenum (be sure to replace the old plenum gasket)
passenger side valve cover under the intake plenum
Located under the plastic cover on the plenum. Has engine size on the cover , black.