Question about 1996 Toyota 4Runner

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Noise coming from under bonnet

There is a noise coming from under my bonnet the noise comes from ( as i am sat at the wheel ) the right hand side it comes about every 15 seconds and sounds like its something that is releasing pressure very annoying wonder if anyone could throw any light on this for me many thanks Mark

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  • Toyota Master
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What you have is the "reed valve" on the charcoal canister actuating. You are very right in you assumption that something is "releasing". What is happening on your vehicle is vapour pressure from the petrol tank overcoming the strength of the "reed valve", and said fumes are being admitted to the charcoal canister, which in turn stores the fuel vapours to be released into the intake (and burned) when your vehicle is running. Pretty much an "emission item"...You can rectify this condition by yourself, all you need to do is order the following part number: 77701-35010 from your Toyota dealer. Remove the metal pipe from the side of the charcoal canister, and affix this new part. Please note that the noise is "normal" and should not be contstrued as something that has failed. The new part just masks the noise, it still has to purge the tank vapours. This is a known condition, and the new part will stop the nuisance noise for you. Hope this helps.

Posted on Sep 22, 2008

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