Electronic Fuel Injection (EFI)

EFI – Fuel injection solenoid resistors

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PURPOSE
The purpose of the fuel injection solenoid resistors are to lower the voltage going to the fuel injection.

THINGS TO LOOK FOR
The fuel injection solenoid resistors are components that rarely go wrong and are used in the early model EFI units.  They are located in a bank situated on the fire wall but they can be checked individually.

IS IT EXPENSIVE TO REPAIR?
These resistors are expensive and can be replaced from your local spare parts outlet or the wreckers.

This ...

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EFI – Carbon canister

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PURPOSE
The carbon canister is designed to soak the fuel vapours from the fuel tank when the engine is turned off or parked in a hot or cold location.   Over time the fuel may expand and the vapours are soaked up by the carbon canister.  When the engine starts the vacuum will draw the vapours, recycle them, and  prevent the vapours from entering the atmosphere. 

THINGS TO LOOK FOR
The carbon canister may be full of petrol if the fuel tank ...

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EFI – Fuel pressure regulator

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PURPOSE
The fuel pressure regulator is a component that regulates the pressure in the fuel rail and also removes the excess pressure and recycles the fuel back into the fuel tank.  The fuel pressure regulator alternates the pressure on idle and full throttle.  This is a physical component.

THINGS TO LOOK FOR
A fuel pressure regulator should have a vacuum hose connected to it.  If not, this will affect the performance of the fuel pressure regulator.  Also a power loss or ...

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EFI – Cold start injector time switch

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PURPOSE
The cold start injector time switch and a cold start injector both have one thing in common.  They are designed to operate when the engine is cold.  The cold start time switch is a timer designed to turn the cold start injector on to enrich the fuel mixture for an easy start.

THINGS TO LOOK FOR
The cold start injector time switch and a cold start injector enrichment program may decide to malfunction and not operate at all or it ...

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EFI – Coolant temperature sensor

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PURPOSE
A coolant temperature sensor is a component designed to feed a value of temperature to the computer.  This allows the computer an accurate measure of temperature making it possible to deliver the correct measure of fuel under each type of temperature.

THINGS TO LOOK FOR
The coolant temperature sensor, if faulty, may affect fuel economy but it is very difficult to check.  A possible check of the fault codes may determine a faulty coolant temperature sensor.  Also removing it and ...

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