The intake plenum on a V-6 or V-8 is bolted to the top of the intake manifold. It has the throttle body bolted to it. The throttle body houses the throttle plate and is located at the end of the tube that starts at the air filter housing. Sometimes the intake manifold on a 4 cylinder is referred to as a plenum. It works the same way and is found in the same manner. Look for the air filter housing, then follow the hose past the throttle body to the intake or plenum.
Its under the intake manifold/plenum towards the rear of the engine
remove upper intake plenum
Under the intake plenum
Follow the intake air plenum from the air filter. It connects to the carburetor. The carburetor is mounted on the intake manifold.
Coolant in the intake plenum of your 1994 Toyota pickup V6 may indicate a problem with the intake manifold gasket or a crack in the intake manifold itself, allowing coolant to leak into the intake system. This can lead to engine overheating, misfires, or other performance issues. It's essential to address this issue promptly to prevent engine damage and ensure proper functioning of your vehicle. Checking for signs of coolant mixing with oil or white smoke from the exhaust can help confirm the problem.
It's directly underneath the plastic cover that covers the top of the engine, the plastic cover pulls off and the intake plenum is underneath it.
intake plenum
It connects to a nipple on the bottom of the intake plenum. Reach under the top left side to find the connection point. With the intake plenum installed it is a blind connection.
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That is the top part of the engine. It is what the throttle body is bolted to.
The plenum is the intake manifold.
under top plenum on 3.1 engine at intake manifold.