Posts Tagged 'giving you the knowledge to help you understand what items to look for to prevent breaking down'

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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Electrical System – COIL AND SPARK PLUG LEADS

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PURPOSE
The purpose of coil and spark plug leads is to deliver high voltage spark from the coil to the spark plugs.  As ignition leads carry a high voltage it is very important to use caution when handling these leads with the ignition on or with the engine idling.  Ignition leads are made of fibres to reduce the possibility of radio wave interference.  Due to the high demand of these leads they may fail at any time. 

THINGS TO LOOK FOR
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General Inspection – BRAKE WARNING LAMPS

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PURPOSE
A brake warning lamp may be a handbrake light, a master cylinder level indicator or a master cylinder losing excessive fluid which enables the switch to be activated.

THINGS TO LOOK FOR
The most serious light indicator is a brake light staying on because the system is leaking excessive fluid.  The first step is to check the fluid reservoir.  If it’s exactly at the full mark while you have the cap off, push the level indicator down to see if ...

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General Inspection – BRAKE LIGHTS

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PURPOSE
Brake lights are designed to let other drivers know when you’re braking.

THINGS TO LOOK FOR
The problem with brake lights is that it’s hard for the driver to know if they are operating or not.  One way to check this is to reverse close to a wall at night and view the reflection of the brake lights in the rear vision mirror.  Also you can ask a friend to view the rear lights while you depress your brake pedal ...

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General Inspection – Loose fan belt

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THE EFFECT
A loose fan belt is a fan belt screaming out for help.  Also a loose fan belt may perish or deteriorate rapidly depending on whether it’s a polyrib belt or a ‘V’ belt.  A loose fan belt will also affect the charge rate and the cooling system if the water pump pulley is connected to that fan belt.  Any fan belt that is loose will affect what it’s driving.

THINGS TO LOOK FOR
Check the belts for tension.  If ...

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General Inspection – Thermo fan not switching on

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THE EFFECT
The car will overheat mainly when it’s idling.

THINGS TO LOOK FOR
A thermo fan should switch on periodically when idling.  If it does not, make sure the connection to the thermostatic fan switch is okay. A fan fuse might also have gone.  Check all the fuses. Find the thermo fan relay, wiggle the relay or swap that relay with an air conditioning relay, provided that the amperage on the relays are all the same.

COST
Depending on why it’s ...

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General Inspection – Thermo fan switching on

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THE EFFECT
The cooling system will maintain normal operating temperature under all driveable conditions. 

THINGS TO LOOK FOR
It’s always a good idea to look at the thermostatic fan to understand how it operates.  Because thermostatic fans are thermostatically controlled, they should switch on and off.  A good thermostatic fan in a very good cooling system will switch on for between 20-40 seconds.  If the fan switches on for longer than 60 seconds this might be a cooling system that is ...

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General Inspection – BALLAST RESISTOR – if fitted

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PURPOSE
The bells resistor lowers the operating voltage to the coil from 12 volts down to 9 volts to maintain a low voltage to the points and condenser.  The bells resistor is bypassed when the starter motor is cranking the engine.  The bells resistor has a working life of approximately 10 years. 

THINGS TO LOOK FOR
Most bells resistors are open circuit making it impossible to start ..The most effective indication of this is when cranking the engine, the engine nearly ...

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