You can test injectors electrically either on or off the car. Unfasten the
wiring and connect an ohmmeter between the two prongs of the electrical connector.
The injectors used in the 929 should have a resistance of 12–16 ohms.
- Relieve the fuel system pressure.
- Remove the delivery pipe and fuel injectors. Affix the injectors to the
distribution pipe with some wire.
NOTE: Affix the injectors firmly to the distribution pipe
so no movement of the injectors is possible.
- Turn the ignition switch to the ON position. Use a jumper
wire and connect the terminals of the fuel pump check connector. Make sure
that the fuel does not leak from the injector nozzles.
- After approximately five minutes, a very small (slight) amount of fuel leakage
from the injectors is acceptable. If this leakage exceeds more than a few
drops, replace the injector. After one minute, a drop of leakage is acceptable.
- If the injector leaks fuel at a fast rate, replace the injector. If the
injectors do not leak, remove all test equipment and install the components
in the reverse order of their removal.
