ELECTRONIC FUEL INJECTION [EFI]
The EFI relay is a heavy duty electronic switch that requires very little voltage to switch on at the same time It may connect a moderate amperage circuit without the switch wearing out. It is also designed to disconnect if overloaded.
THINGS TO LOOK FOR
The EFI relay is an important switch that rarely goes wrong as most relays are reliable for approximately 10 years. After this time they may start to develop intermittent problems, eg cutting out. Also when the relay cools down the engine may start up. To check this suspect relay by swapping with another. You may find a row of relays and take a note of what they are connect to, eg the air, fan or pump, provided the relay is the same amperage and shape as the air or fan then it may be swapped. If this makes a difference it just needs to be replaced.
IS IT EXPENSIVE TO REPAIR?
The average relay may cost around $10.00-$20.00 depending on the make. If it is a tachometric relay it may cost around $30.00-$80.00.
TEMPORARY REPAIR AND LONG TERM REPLACEMENT
If you are stranded and have a suspect relay swap it or bridge it just to get you home.