Peace” Jay R.Ĭopyright 2010 : Engine Basics. So much mis-information on forums, good to read some solid info. Thank you for showing the REAL easy way, and saving me some money.” Joe Sĭon’t have any questions, just wanted to say thanks for putting this info out there. Info from every other site I looked at, only said how to do it using costly special tools. “Thank you, for the info, on your site, on how to remove valve springs, and install stem seals, using normal shop tools. **TO SUBMIT AN ARTICLE TO ENGINE BASICS PLEASE CLICK: CONTACT US! If you enjoyed the information and article you just read be sure to check out our newly released book with even more exciting photo's and information:īelow are just a few of the articles found here on Reading Spark Plugs The longer the pulse width, the more fuel is injected. This computer output signal is called the injector pulse width. As engine load and rpm are increased, the injector open times are increased to match increasing airflow. The longer that the injector is open, the more fuel is injected. The computer produces a signal to open the injectors for a certain length of time depending on engine conditions relayed by sensors. Fuel delivery is controlled by the injectors which are cycled by the computer. Fuel is delivered to the injector by a high pressure electric pump at around 40 psi. When the solenoid is energized, fuel sprays out into the valve port. Most vehicles today use 1 injector per cylinder. Basic TheoryĮFI uses solenoid valves called injectors to meter fuel delivery. EFI is certainly not new, as its roots were firmly established over 30 years ago. Today, over 95% of all cars produced are EFI equipped. By 1985, the first digital systems were in widespread use worldwide by most manufacturers to some degree and the days of the carburetor were numbered. Many German and American car companies were slow to embrace EFI for reasons unknown. Nissan, Toyota and BMW notably equipped almost all of their higher end models with the Bosch system by 1982. Emission regulations and the energy crisis in the mid '70s caused most car manufacturers to consider the switch to EFI. The '70s saw the introduction of the excellent L Jetronic system and licensed spinoffs built in other countries. This system was well engineered and quite reliable given the technology available at the time. The Bosch D Jetronic analog system was widely used by Volvo and VW. HistoryĮFI as applied to automobiles in mass production use was first introduced in the late 1960s. The injector pumps gas into an intake passage before the intake valve. Other type is throttle body mounted injectors. The injector pumps gas directly into the cylinder. Therell be a sparkplug and Fuel injector right next to it. This article is intended for those people who have had little experience with electronic fuel injection and would like to have a handle on the basics. The Direct injection (DI) the injector is mounted directly on the cylinder head.
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