Natural pollution has been present on earth since before man appeared and continues to be a factor when discussing air pollution, although it causes only a small percentage of the overall pollution problem. It is the direct result of decaying organic matter, wind born smoke and particulates from such natural events as plain and forest…
What is Neutral?
Neutral (gear). Neutral is actually not a gear. When your vehicle is in neutral, the gearbox and engine are completely disconnected. Thus, your car is able to roll freely whether the engine is on or off.
What is NOX?
An acronym for Oxides of Nitrogen, a primary emission produced in the combustion chamber under high temperatures when nitrogen combines with oxygen. Oxides of nitrogen contribute to the formation of smog.
What is ORVR?
On Board Refueling Vapor Recovery (ORVR). Nissan/Infiniti uses the ORVR system to recover the vapors from the gas tank. From the beginning of refueling, the air and vapor inside the fuel tank go through refueling EVAP vapor cut valve and EVAP/ORVR line to the EVAP canister. The vapor is absorbed by the EVAP canister and…
What is Oil Pan?
The oil pan is where the oil in your engine is stored.
What is Owners Manual?
The owner’s manual is the booklet supplied with all cars when they are sold new. It is usually placed in the glovebox. Your owner’s manual contains information about the equipment your car has, what kinds of fluids and lubricants to use, and how to maintain your car. If you don’t have an owner’s manual, you…
What is Odometer?
The odometer measures how many miles are on your vehicle.
What is Octane?
A fuel octane rating measures a fuel’s resistance to knocking or pinging.
What is Oil Filter?
The oil filter removes most particles and contaminates from your engine’s oil to protect your engine’s internal moving parts.
What is Oil Pressure Sensor?
The oil pressure sensor measures the pressure at which your engine’s oil is flowing. If the pressure becomes too high or too low, the oil pressure sensor sends a signal to the vehicle’s oil pressure warning light. If you see this light turn on, pull over as soon as possible and shut off your engine….
What is Oil Pump?
The oil pump takes oil from the oil pan and pressurizes it, allowing it to travel throughout the engine and lubricate the engine’s moving parts.
What is Overheating?
Overheating occurs when an engine reaches too high of an operating temperature. Overheating may lead to potentially significant engine damage.
What is OHC?
Over Head Cam (OHC). An overhead cam engine has its camshaft in the cylinder head, above the valves and cylinders. This allows the camshaft to directly open the valves without using pushrods.
What is Overdrive?
Overdrive is a transmission gear that allows the engine to turn at a reduced rpm for a given road speed.
What is OHV?
Over Head Valve (OHV). An overhead valve engine has its camshaft in the engine block. It uses lifters, pushrods and rocker arms to open and close the valves in the cylinder head.
What is Ohm?
The ohm (symbol:
What is Oxygen Sensor?
The oxygen sensor is part of the exhaust and emission systems. It senses the amount of air in the exhaust and adjusts the fuel system’s operation accordingly to minimize emissions while improving econmy and performance.
What is PCV?
The Positive Crankcase Ventilation (PCV) system provides effective evacuation of crankcase vapors. Fresh air from the air filter housing is supplied to the crankcase, where it is mixed with the blow-by gases and passed through the PCV valve and into the intake manifold. This mixture is then passed into the combustion chamber and burned. The…
What is Parking Brake?
Also known as the emergency brake. The parking brake is used when parking on an incline to prevent the car from rolling away.
What is Plastic Polish?
A special type of polish designed to gently remove scratches and yellowing from plastic items such as convertible top windows and plastic lenses.