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Viewing from the front and looking under the bonnet locate the air filter housing.There is a rubber pipe about 20mil. in diameter going into the housing on the left hand side. Trace that back to find that it goes into a metal housing. Attached to that housing is theAGR valve hich looks and operates in the same way as the advance mechanism on the old distributor on a petrol engine. There are two small pipes attached to the AGR valve which connect to a switch which partly conrols the agr valve.

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16y ago

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