Jim Grant's Tech Tips
'90
Lincoln Continental, Fuel Injector Problems
Q:
I have a 90 Lincoln that won't start. The fuel injectors are
not getting any power to open, so the fuel will not go through. The fuel
pump turns on for about 15 seconds and shuts off. I checked the grounds
and tested each injector-theyre fine. Can you help?
A: Are
you sure the fuel injectors are not getting any electrical power? When
the ignition is turned on, with an electrical connector for the fuel injector
unplugged, there will be battery voltage present at the red wire of the
fuel injection connector. The other wire, goes to the vehicles computer
which controls the operation of the fuel injector. There is a component
called an Integrated Control Relay Module (ICRM) that is mounted on the
drivers side of the radiator under a plastic shield. The power supply
for the fuel injectors is controlled by this module. The fuel pump is
also activated by this module. Because you say the fuel pump is functioning
then one would be led to believe that the power supply (fuse) to the ICRM
is good. Youll have to check the wire coming from the ICRM to the
fuel injectors. If there is electrical power coming out of the ICRM but
is not getting to the fuel injectors, then there is a break in the wiring
that will have to be repaired. If there is no electrical power coming
from the ICRM to the fuel injectors than it is likely the ICRM will have
to be replaced. To save on cost of the replacement part you may check
with a salvage yard for a replacement.
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