BMW E30 fuel injectors and fuel injection
How do I identify leaking injectors on an E30?
A typical symptom is poor starting when a warm engine has stood for an hour or two. Right after shutting off there is usually no problem. Leaking injectors do not usually stall the engine, but they make restarting difficult.
How do I test and fix leaking injectors?
Test: warm the engine to half temperature, remove the fuel pump relay and let the engine stall. Put the relay back and start: if the engine starts easily, the injectors are probably leaking. The fix is an injector service: cleaning and replacing the O-rings and the tip's injector seat.
In what order are the E30 injector wires connected?
The wires are connected in numerical order: wire 1 to injector 1, wire 2 to injector 2 and so on. At the end of the wire, before the connector, there is a light-coloured ring with a number. A disconnected or poorly connected injector wire makes the engine sluggish because the injector does not work.
What injection system does the E30 320i have?
The 320i from 1983–1987 has L-Jetronic injection. From 1988, facelift cars have Motronic. On the M10 engine, the injectors in L-Jetronic are in the intake manifold.