not enirely sure this is what you mean but i think you meen the 5th and 6th intake ports.
only NA Rx7's have them, all turbo version have 4 intake ports.
NA 13b engines have these ports so that the engine can take advantage of a smaller intake tract at lower rpm creating torque however later on the 5th and 6th ports are opened by actuators to release high rpm horse power. Without the 5th and 6th ports the engine would be sluggish when rpm is fairly low.
These 5th and 6th ports operate in a similar functionality to the V-tec engine of Honda civics, the 13b engine like the V-tec can change the internal dimension of the intake tract for its own benefit to get the best of both worlds, only v-tec engines do this with exhaust ports as well but that's beyond the scope of this reply.
Turbo 13b engines have no need for 6 ports, due to air being compressed 4 ports is quite sufficient to get the air into the housings.
On the side of the intake manifold.
bellow the intake manifold
The intake runner control is in he intake manifold. It consists of a shaft and 3 butterfly valves for each cylinder bank. The opening of these valves are controlled by an electronic module located on the back of the engine behind the intake manifold ducting on top of the engine. Each set of butterfly valves are connected to the module by a link. When the computer notifies the module to open the butterfly valves, it rotates a small motor in the module, moves the links and opens the butterfly valves. The module is very difficult to get to and you must remove the top ducting to see the links and the butterfly valves
throttle module under hood attached to the intake manifold needs replaced
The electronic control module or unit on a 2003 Mini Cooper is located under the hood. It is on the rear of the intake manifold.
1994 was the last year the Ranger used an ignition control module on the 2.3 and 2.5. The ignition control module was attached to the lower intake manifold.
It is located under intake manifold towards the back. It is above the starter.
The ignition module on a 1988 Chevy Celebrity with 2.5 engine is on the side of the block beneath the intake manifold. You can simply follow the spark plug wires to it. As information the crankshaft position sensor is behind the ignition module.
The ignition module on a 86 ciara 2.5 is located under hood, center,lower engine area,below driver side of intake manifold . mounted inside of distributor
under the intake manifold. Only way to it is on the back side of motor. You will need a long/thin 10m.m. socket to get it off.
The Manifold absolute pressure monitors intake manifold pressure and ambient barometric pressure. The PCM/ power train control module uses this input signal to determine engine load and adjusts fuel injection duration accordingly.
the ignition control module is operated by the pcm,the pcm tells the ignition control module when to energize the coils to enable spark
It is underneath the upper intake manifold. When you do this, be sure to tap the fuel injector module down with a rubber mallet to separate it from the intake plate otherwise you will do damage to the injectors!! Also be sure to put the module all the way back into the intake plate and reconnect the two fuel rails before you start putting the screws back into the plate. This will save at least 20 min of frustration.
The location of the crankshaft position sensor depends on which engine your car has. If it is the 2.5L 4 cylinder it is below the intake manifold behind the ignition module. If it is the 2.8L V6 it is below the exhaust manifold on the firewall side of the engine block, in about the center of the engine.
Buzz Aldrin was the one who piloted the Lunar Module. Armstrong was on board it too.
The MAP (Manifold Absolute Pressure) sensor monitors the pressure inside the intake manifold and sends that info to the ECM (Engine Control Module). The ECM uses that info and input from other sensors to make the engine run its best under all conditions.
High idle can be from a malfunctioning coolant temperature sensor, idle air control, throttle linkage problem or a intake manifold leak or (vacuum leak). I have come across many v8 fords with intake manifold leaks. Unplug the connector on the idle air control, if it still has a high idle, it will either be the idle air control seized, throttle linkage or a intake manifold leak (air leaking into the manifold through a gasket or vacuum leak) If the idle comes down it will be the coolant temperature sensor or a power train control module problem. A scan should pickup a coolant temperature sensor out of range fault code if it's at fault.
iat stands for intake air temperature so it is on the intake side between the air filter and the intake throttle body
The intake air temperature (IAT) is located inside the intake housing close to the air filter.
If your 1987 Celebrity has the 4 cylinder 2.5L engine The ignition module is mounted to the engine block beneath the intake manifold. First unplug the electrical connector, then mark the spark plug wires so you know where to put them back and unplug the spark plug wires. Remove the bolts that hold the ignition module in place. Then unplug the module from the crankshaft position sensor and remove the module from the vehicle. Reverse the procedure to reinstall. If your vehicle has the V6 2.8L engine: Raise the car and put on stands as necessary. The ignition module is bolted to the block below the exhaust manifold on the radiator side of the engine. Unplug the electrical connections. Mark the spark plug wires so you know where to put them back and unplug them. Next remove the bolts that hold the module in place and remove it. Reverse the procedure to reinstall.
The 1990 Chevy Celebrity engine is distributorless, the ignition is handled by a combination of the engine control module(computer) and the ignition control module. You did not mention which engine the car has. If your car has the 4 cylinder engine the ignition control module is below the intake manifold at the rear of the engine. You can follow the spark plug wires to it. The coils are mounted to the ignition control module. If your car has the V6 the ignition control module is near the starter and again you can follow the spark plug wires to it. Again the coils are mounted to the ignition control module.
I am assuming that you are asking about a Celebrity 2.5L engine with distributor-less ignition. If so, there are two coils mounted to the ignition module, each provides spark to two cylinders. They are located on the side of the engine block underneath the intake manifold. You did not ask, but the crankshaft position sensor is underneath the ignition module.
If your 89 Celebrity has the 2.5L 4 cylinder engine the ignition module is mounted on the block below the intake manifold toward the drivers side of the engine. If your 89 Celebrity has the 2.8L V6 the ignition module is mounted on the block on the radiator side of the engine on the drivers side. Both are a bit of a pain to get to, but it is doable.
Replace intake manifold gasket. Refer to saturnfans.com for a how-to with pictures.
You can not because it doesn't have one. It uses a new electrically controled by wire throttle system that has done away with the IAC and in its place uses a throttle actuator "control module" located on the intake manifold.