Vauxhall Tigra engineproblem

try putting a fuel additive in the fuel tank, use one that will clean the fuel system , the only downside of this is that if the valves are sticking due to carbon build up and the engine is high mileage removing the carbon may cause the engine to loose power or smoke if carbon is cleaned from pistons. so only do this if you are confident that the engine is in good nick

car sounds like exhaust blowing compression test showed low no1 piston no little about cars 3 different diagnosis so far needs new piston maby valve or valves and sticky valves taken our moleys advice added cleaner to fuel no change added cleaner with caution should i add more or is this relly going to cost me 6-7 hundred quid quote given by engine re build comp birkenhead seems i am prime target for rip with such little knowledge can you help clue me up please many thanks paultyrer63 big up 4 moley