It might have something to do with emissions
Most likely, you'll see one or two charcoal boxes, and this pipe will be part of the smog pump assembly. It shouldn't be a direct connection between the carb and the exhaust.
In automotive engineering, an exhaust manifold collects the exhaust gases from multiple cylinders into one pipe. The word manifold comes from the Old English word manigfeald and feald and refers to the folding together of multiple inputs and outputs. Hope this helped.
That is the charge air pipe.It has four nuts where is connects onto the exhaust manifold and also ties into the exhaust collector mounted directly below going to the exhaust system.The charge air pipe goes to the housing on the front of the air cleaner housing which has three air filters inside the housing.
It is underneath the car, at the exhaust manifold where it comes off the engine...access it from the bottom
there are most likely four. two on each side of the 2 exhaust manifolds. on each side one sensor is located high on the manifold where it comes out of the block the other is lower down almost where the exhaust manifold connects to the exhaust pipe....after the first cat. converter. before the second on each side.
The EGR valve on mine is behing the intake manifold. Comes off the back exhaust manifold. Right behind the inake inlet.
on the passenger side underneath the cab. in front of the cat. where the exhaust manifold comes together.
to put a bigger main jet, to put more gas to the engine. take the carburetor off. on the bottom are three screws you need to take off. then the carburetor comes in two. the biggest screw head at the top of the brass things, is the main jet. it comes out of the pilot jet, which comes out of the carb if you unscrew it. take out the main jet and put a bigger main jet in. you'll also want a free flow exhaust and free flow muffler.
remove the starter bolts your 12v power supply and ignition wire then remove exhaust bolts from manifold a few twist and turns and out she comes
It's two fans bolted together. One of them is hooked to the exhaust manifold, the other to the intake manifold. The faster you run the engine, the more exhaust comes out; the more exhaust, the faster the turbo turns. As the turbo speeds up it pumps more air into the engine, which causes the engine's fuel injection to pump more fuel in to compensate for the now-lean condition, and you get more power than you normally would.
Catalytic converters are located up towards the front of the exhaust system - typically right after the pipe comes down off the engine's exhaust manifolds. If the vehicle has a single exhaust system, there will be a "Y-pipe" bringing the two exhaust manifold pipes together - the catalytic converter will be just past this. If the car has dual exhaust, there will be a catalytic converter for each.
When Exhaust brake is on squeak noise comes from the engine?"
On a 4 cylinder engine there may be 2 oxygen sensors.The first will be at the connection between the exhaust manifold and the head-pipe; that's where the exhaust from the 4 cylinders comes together then the manifold connects into the next part of the exhaust system.There should be a device screwed into the exhaust manifold that looks a little like a spark-plug. It should have an electrical connection and after 18 years, it may be a little tough to get out.You can cut the wires then remove the old sensor. The instructions on the new sensor should show you which wires go where, since they may not be the same colors.So much for the first sensor.The second sensor is after the catalytic converter. It screws in much the same as the first.Note that the first sensor, the one in the exhaust manifold, is the one that wears out far more often than the secondary sensor.