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Thank you very much for all of the advice, the garage is an mot garage so will get the exhaust probe test done as well as compression. WIll let you know how I get on.

Thanks for your reply, do you think it could be the valve stem seals, my mechanic reckons so. I'm planning to get it down to Lexus but don't want to waste money on towing it down only to be told the same thing. Than you

Hello Everyone The car is a 1999 IS200 it has covered 70k miles with full service hist up until 2010 and 2 owners. The cars ECU went a year ago and a new second hand unit was fitted Then the car began smoking and drinking fuel really badly. An example is I put in 20 litres of fuel and it drank it within 10minutes. There is a serious amount of white smoke coming from the exhaust i.e thick clouds and a very very strong smell of fuel from the car/exhaust. There are also drops of I think water dripping from the exhaust. Two coil packs were bad and these were replaced. There was an engine management light on which was apparently caused by two injectors which were faulty and these were also changed but to no effect. The garage has no idea whats wrong with the car, they are saying something about the valves that control the flow of fuel but I have now given up on them. If anyone knows or has any ideas as to why this is happening your help will be appreciated. Thank you