You made a big deal earlier about "D-jet" and "L-jet" FI systems. What are they?

Two of the earliest forms of Bosch Electronic Fuel Injection. For a good description of theory and general practice, see Probst s book "Bosch Fuel Injection and Engine Management", published by Bentley Books. This is a good book on Bosch EFI systems, and is highly recommended.

Both fuel systems are designed to get the correct amount of fuel into the combustion chamber at the right time. The "correct amount" depends on RPM, engine load (almost but not quite == throttle position), engine temperature, and other factors. The main difference between the two systems used on 914s is the method of measuring engine load.

The D-Jetronic system measures the air pressure in the intake manifold. The pressure sensor lives on the right-hand side of the engine compartment, below the battery. It looks like a small metal pineapple with one hose and one bundle of wires going to it.

This system is less accurate at determining engine load than the L-Jetronic system. It was used on all 1.7 and 2.0-liter ... more.

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