GMC produces big trucks and big SUVs which equate to bigger fuel combustion and
exhaust gases. To compliment this, GMC has dependable exhaust system that works
to keep the exhaust gases in one direction, save fuel, silence the engine noise
produced by engine combustion, and convert these gases into lesser harmful ones.
As the fuel combustion occurs inside the engine, the exhaust system headed by
the exhaust manifold collects gases.
The exhaust manifold is composed of connected at the exit passage of each cylinder.
Usually made from cast or nodular iron, the exhaust manifold is designed according
to the type and size of the engine and the number of cylinders. The exhaust gases
in the form of hydrocarbons or the unburned fuel, carbon dioxide, sulfur dioxide,
carbon monoxide, nitrogen oxides, phosphorus lead and other metals from each cylinder
will merged into one pipe that will directly go to the catalytic converter.
The catalytic converter transforms these gases into water vapor and carbon dioxide.
These would then go through several pipes and parts. The resonator and muffler,
another part of the exhaust system, reduces the noise level produced by the combustion
before the gases lead to the tail pipe and joins the air. All modern vehicles
are equipped with oxygen sensor which measures the oxygen content of exhaust for
Like every part of the exhaust system, the exhaust manifold encounters its worst
enemy, corrosion- in other words, rust. This reduces the life span of the manifold
that could result to lesser gas mileage and leads to leaks if the situation worsen.
To avoid these, proper maintenance is required for the maximum efficiency of the
exhaust manifold and the rest of the system.