I have 51 plate vectra 2.2 112k , and aprox. 4 weeks ago chain tensioner has broken and chain has slipped, taken car to first mechanic replace tensioneer and car still not running , went to 2nd mechanic replace whole cam chain kit + 8 inlet valves wore broken and gasket, put everythink back togheter . Car tryes to start but like just when to start it won't. Taken car to 3rd mechanic , he put car on computer and got no errors, then tryed to crank it and a huge blow and smoke coming out. He sayed timing is wrong.. is that true? Because if so i need take car back to 2nd mechanic. I'm getting tired of this, is there any good z22se mechanic in LONDON AREA that might be able to help ? Please leave me a PM or contact me at 07565623405 ! Or advices what else could be wrong because so far the bill is 400quid. thank you