Engine System

EFI – Air flow meter

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PURPOSE
The air flow meter is a component to allow the velocity of air through it and at the same time it measures the air passing either by a hot wire or a flap connected to a potentiometer.  This value is sent to the computer indicating the quantity of fuel required.  If the air flow meter is a hot wire type it also has a self cleaning process to keep the wire clean from the value interference.

THINGS TO LOOK FOR
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EFI – EGR valve [Exhaust gas recirculation valve]

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PURPOSE
The EGR valve is design to recirculate exhaust gases but only after idle and before full throttle.  The EGR valve operates mainly on cruising. 

THINGS TO LOOK FOR
Over time the EGR valve may be responsible for poor idle.  EGR valves are sometimes difficult to pinpoint as being the perpetrator of a poor idle.  A quick inspection to see if the needle is moving or if any exhaust gases are coming from the valve may be determined by an electronic ...

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General Inspection – Clutch slave cylinder

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PURPOSE
The clutch slave cylinder is designed to plush the clutch lever in order to engage or disengage the clutch lever or fork.  The clutch slave cylinder has a bleeding nipple fitted  and bleeds the clutch hydraulic system.

THINGS TO LOOK FOR
The clutch slave cylinder is a component under pressure while it is in use making it possible to leak.  If there are any drops, or dampness is found around the clutch slave cylinder, it needs to be attended to ...

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General Inspection – CARBURETTOR

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PURPOSE
The carburettor is a very important multi function component as it mixes air and fuel together and it allows the engine to idle, to rev and to maintain desired speeds and overtake on full throttle.  At the same time its purpose is to mix air and fuel at the correct ratio.  The carburettor is only designed to operate with clean fuel and must be mounted securely in the manifold. 

THINGS TO LOOK FOR
The carburettor is capable of leaking fuel.  ...

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General Inspection – Distributor drive stripped

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THE EFFECT
Non start..

THINGS TO LOOK FOR
Remove the distributor cap and have a look at the rotor button when cranking.  If it doesn’t turn, this is either the distributor drive stripped or the cam shaft gear stripped.

COST
Somewhere between $65.00-$300.00.

 

This article is found in the Virtual mechanic CD Rom
You can download it for the price of a latte, but you will learn not to buy a lemon
By Darren Gow-Brown, Melbourne Australia ©2009

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General Inspection – Tappet noise

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THE EFFECT
A tappet noise can be an irritating noise but it is better than a quiet tappet.  Tappet noise may be the result of hydraulic tappets requiring replacement.  It also may be the effect of a low oil level or the result of the tappets requiring adjusting.

THINGS TO LOOK FOR
Check the oil.  If it’s been a long time since the oil has been changed, eg. 10,000kms, change the oil.   Consult your local spare parts dealer and tell them ...

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General Inspection – Ring gear slipping

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THE EFFECT
The whole neighborhood gets to hear it!  It’s a high pitched metallic noise that when cranking the pinion gear from the starter motor is trying to turn the ring gear that has no teeth left. 

THINGS TO LOOK FOR
Basically what you will find is that with every second crank, every fifth, fifteenth or hundredth crank, you will hear this noise..  If the noises become more common, eg. every second or third or tenth crank, it’s time to get ...

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General Inspection – Loose timing belt

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THE EFFECT
A loose timing belt will rub up against the plastic housing surrounding the belt.  It also can cause a distributor drive to chatter at idle.  A loose fan belt may slip causing the timing to go out which can give poor performance or  cause a potential misfire.

THINGS TO LOOK FOR
If you feel you have a suspect timing belt you may have to remove some of the housing to get to it to feel the belt  to see ...

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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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