Hi I have Ford Focus 2.0 trend 2000 modle and it smokes heaverly on start up but once it is warm no smoke at all. I have recond the head complete and sent it back for a check, they there is nothing wrong with head. I have repaced the warmup / idle valve on the inlet manufold still the same. The car does not lack in power at all, it is very quick. What could the problem be. Regards Mike

I would need to know what color this smoke is because of it is white then I would say that you are probably witnessing normal operation. Modern Cat. Converters are designed to reduce emissions to carbon dioxide and water. This water condenses in the exhaust as it cools while shut off and produces white smoke when restarted until the exhaust is warm enough to evaporate the moisture. If the smoke is blue then you are getting oil leaking into the cylinder and it is probably coming from the valve seals but without a visual inspection that is impossible to be sure.

It sounds like valve guide seals to me if the smoke is from oil which would be white smoke as opposed to steam if its a water issue.. but valve guide seals would be a common problem for an older engine however they should have replaced those seals on the rebuild of the head..something may be wrong with the head, its hard to tell