Sounds like big end knock when hot

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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.

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