I'm not familiar with any such procedure on this vehicle.
Several hours at least. The entire intake manifold must be removed, along with ancillaries. The cooling system must be drained.
The EGR valve is located on the top of the intake manifold rearward of the throttle crank under the cowl. If you suspect a problem with the system, you may want to check the EGR control solenoid, the EGR control backpressure transducer and all vacuum hoses.
Intake or inlet manifold has nothing to do with the heating of the car. Newaz.
inside a can of sprite
There is no need to do this normally.
Not necessary on this vehicle.
This should not be necessary on this vehicle.
It doesn't have an O2 sensor in the intake manifold. O2 sensors are located in the exhaust system at various points.
Does the heater work when you go down the road and stop when you come to an idle? If so, I had the same problem several years ago with my 1993 mercury villager. The water level is too low. Although the radiator appears to be full, you have to bleed the system. On the top of the intake manifold (Center) there is a small bolt that needs to be taken out. It's very hard to get too and don't drop it! The bolt is above the radiator level but if you don't remove it you get air trapped in the top portion of the manifold and hot water doesn't go through the heater coil. With the bolt on top of the intake manifold removed, start your engine and slowly keep pouring water into the radiator until water comes out the hole where you took the bolt out. Put the bolt back in and tighten it up.
Yes, the 1993 Mercury Villager was a 1992 Nissan Quest. The last year Nissan used a Carburetor on a Quest. Fuel injection system replaced the carburetor in 1993.
The sensor should be located on the intake boot(air intake system) or on the intake manifold.
O2 sensors are always located on the exhaust system.