Fuel injection system for the Chevy Cobalt and Cobalt SS 2005-2009.
All new cars sold in the United States have injection system that are designed to meet efficiency and environmental emission laws.
Carburetors can still be purchased for cars equipped to run with them.
Carburetors were once standard equipment on new cars, but with increased emission and efficiency requirements they were replaced by throttle body injection system. These early injection system had electrically controlled injection valves incorporated into the throttle body. For the most part they were direct bolt on replacements for the carburetor which resulted in minimum changes to engine designs. This saved the auto makers huge sums of money.
As technology progressed new engines were designed that required more advanced injection system. Thus the multi-port injection system was born. Multi-port injection system have a injector for each cylinder that spray right at the intake valves. Quicker response and more accurate gas metering is realized with the multi-port injection system.
A common misconception occurs when talking about the injection system. First thought is that the injectors inject gas, but what they really do is they regulate how much air enters the engine. So when you step on the gas pedal you're really stepping on an air pedal which opens the throttle valve up more letting more air into the engine. Increasing the gas rate is controlled by the engine control valve (ECU) which sees the throttle valve open up more and increases the gas rate as more air enters the engine. The ECU uses information from sensors monitoring the mass of air entering the engine as well as the amount of oxygen in the exhaust to fine tune the fuel delivery system so that the air to fuel ratio is just right.
The engine sensors monitored by the ECU are; mass airflow, oxygen sensors, throttle position sensor, coolant temperature sensor, voltage sensor, manifold absolute pressure sensor, and the engine speed sensor.
The types of control for the multi-port injection system are the injection system that opens all the injectors at the same time and the injection system that opens the injectors just before the intake valve for its cylinder opens. The advantage to opening the injectors just before the intake valve opens is that in sudden changes, the system can respond more quickly because it only has to wait until the next intake valve opens to make the change.
Cobaltmania.com has injectors in stock for the Chevy Cobalt and Cobalt SS 2005-2009. Give us a try.
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- · Power and performance upgrades
- · Performance injection system
- · Meets Environmental Emission Laws
- · Regulates Amount of Air
- · Efficient
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