Not sure what engine you are working on but if you are using a new gasket there is no need for silicone unless the directions included with the new gasket require it.
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.
on the 305 EFI its located direct center underneath the intake plenum. have fun. its a nightmare.
Under the hood, they are plugged into the Intake plenum by the MAF.
First check your throttle body sensor and then your (iac) motor. Last but not least it could be your plenum gasket or a leak in your vacuum system
if you mean it doesnt crank long enough to start you probably need a battery. i suspect that the battery is dead because it takes so long to start. long crank times on these engines is usually caused by a bad cold start injector (found in the intake plenum on the passenger side, it has a small diameter steel fuel line and a 2 wire plug connected to it. held in place by 2 10mm screws) or the cold start injector time switch (found in the back of the engine behind the intake plenum, it sits in an aluminum casting that holds other water temp sensors and has a blue plug with 2 wires on it). replace these 2 items and you should be fine as far as hard starting goes.
It is on the underside of the intake manifold
very carefully
yes it is
Which plenum-intake or. . . .
starter is located under intake plenum on 4.6 cadillac motor .which is the engine valley between cylinder heads.Can be replaced without changing intake gaskets if careful about lifting intake plenum/gaskets are silicone rubber and can be reused if not damaged
The manifold gasket is the same as the plenum gasket. The manifold gasket is a barrier between the manifold and the engine block.
No.
White smoke is coolant in the cylinders. Died and won't restart cause the spark plugs are shorted with coolant. If you keep trying to start it without fixing it you could bend a rod! Most likely it is a failed intake manifold gasket or intake plenum gasket or the intake plenum itself. Don't drive the car cause if it is the plenum leaking coolant into the engine it can fill a cylinder with coolant and do major damage when you try to start it. No way to know for sure which of the three it is without pulling the plenum. If you're pulling that you might as well change the intake manifold gasket too. Could be a bad head gasket
You will need a intake manifold set and possibly a plenum gasket set.
You have to remove the throttle body/air intake plenum to get to the rear plugs. I believe the plenum is supported with two or three stays which are hard to see. You will need a new gasket for the plenum/intake manifold interface.One post on Toyota Nation Forum says that it can be done without removing the plenum. I think he is skilled at beating the clock at a repair shop.
The plenum is the intake manifold.
== == First, you have to find out where it's leaking FROM. It might be blowby with a lot of oil mixed in it, picked up by the PCV valve and dumping into the intake manifold. It might be transmission fluid from a bad vacuum modulator. Find out where it's comming from first, then figure out what's wrong and what needs to be repaired. oil should not be leaking into the intake manifold. If you are burning oil then the first thing i would check are the heads and pistons Answer that is a very common problem on those trucks. there is an inspection cover on the bottom side of the intake manifold called the plenum. the plenum gasket blows out all the time on those trucks. it causes the intake to suck oil out of the cam valley. there is a replacement gasket that is now metal instead of silicone, as well as aftermarket inspection covers.