Sounds like big end knock when hot. Check the carbon charcoal canister. See if the relief valve has seized (this is an anti-pollution device that catches excess fuel and feeds it back into the engine later). A seized valve can sound just like big end knock. True big end knock is apparent when cold all the way through to hot and doesn't go away! Try a small can of RESTORE and 'baby' the engine. If the noise reduces then try more RESTORE to gain additional improvements. No guarantees, but we are trying to help with a very expensive problem.
Sounds like big end knock when hot
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17 November 2008
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