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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
The main thing to affect the air flow meter is the large ducting connected to the unit. Also any vacuum leaks will affect the air flow meter value.  A potentiometer may wear its contacts causing a possible flat spot or non start.  Its enemy is a backfire as this will twist the flap making it impossible to move freely.  A quick perusal will determine if the flap is twisted after a backfire thus requiring replacement.  The hot wire type may break, the wiring causing a non start.  The hot wire also has a self clean program.

IS IT EXPENSIVE TO REPAIR?
Either air flow meters are expensive to replace costing around $600.00 depending on the make.

TEMPORARY REPAIR AND LONG TERM REPLACEMENT
Most common types of air flow meters are now reconditioned costing around $300.00.  Make sure you keep your receipt in the Virtual Mechanic folder, as air flow meters do play up from time to time.

 
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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