Fuel System
Fuel control can be divided into two elements: First, through a variety of electrically driven components, the hydraulic function of the system ensures that clean pressurized fuel is available at the injectors. The second element, fuel control, is accomplished by monitoring INPUT signals from sensors reflecting vehicle and engine operating conditions and driver demands. From this information the computer uses it program to compute how long to hold each injector open. This OUPUT is referred to as pulse width. The resulting combustion byproducts are monitored by the oxygen sensor. Using this INPUT as a correction, pulse width is recomputed for the next cylinder.
Fuel System Maintenance Tips
- Chang fuel filter every 20,000 miles or 1 year
- Clean idle passage every 20,000 miles
- Clean throttle blades every 20,000 miles
- Clean back of fuel distributor plate (primarily on German manufactured vehicles) every 20,000 miles
- Check air temperature sensor at 10,000 miles
- Check throttle bolt torque (if applicable) at 20,000 miles
- Check fuel lines for signs of deterioration and cracking every 2 years or 20,000 miles
- Change oxygen sensor every 30,000 miles
- Clean fuel injectors every 30,000 miles
- Change gas cap every 30,000 miles
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Credits:
Illustrations–Russell von Sauers
Tips–Car Quest