The major parts of your engine:

Spark Plug:

The spark plug does just what it says, it creates a spark.  The spark ignites the mixture of fuel and air causing the “explosion” of “combustion”  the produces the energy that moves our vehicles forward and backward. 

Problems:  If the spark plug does not fire properly or in proper sequence, it can cause major problems effecting the smooth operation of your car.

Valves:

There are two types of “valves” in your engine, the intake and the exhaust.  Each must operate in proper sequence for the engine to perform at its peak.  The intake valve opens to bring the fuel and air mixture into the combustion chamber for ignition. The exhaust valve opens to release the by-product of the spark plug, fuel & air ignition.  This is part of the engines emissions.

Pistons:

A metal cylinder that acts like the pedal on a bicycle.  The exploding fuel/air mixture in the combustion chamber drives the piston downward.  The downward motion completes one stroke in the four stroke engine.  The pistion rings are an important part of internal combustion process.  The Pistion Rings act as a seal to keep the fuel/air mixture out of the oil pan and to keep the oil out of the combusiton area. 

Note:  When you smell oil burning it ist likely that the pistion rings are worn on your vehicle.  Your Medley's Auto Care professional can help you discover virtually any problem with your vehicle.