Lucas/Bosch L-Jetronic - Efi - How it Works
The EFi (Electronic Fuel injection) system for the TR8 is actually the well known Bosch L-jetronic system adapted by Lucas. Most components are manufactured by Bosch itself (As you can see by the Bosch part numbers on most of the injection parts). This page aims to give an introduction to the Bosch/Lucas L-jetronics system as used on the TR8.
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Fuel is drawn from the tank to a high pressure pump which pushes it through a fine meshed filter to the fuel pressure regulator. The excess fuel is drained back into the tank. The fuel is then transported through a fuel rail to the injectors and the cold start injector. The air is drawn in from the air filter through the air flow sensor which incorporates a temperature sensor. From there the air flows through the plenum chamber into the engine. The injectors are opened for a short time.
The duration is calculated by the ECU and depends on:
The Fuel Tank