Hi,My mil light came on so i put my code reader onto the car & the fault was the egr valve (needing a spring clean) so my polish fitter friend said he would do it so i left it with him while i did some other work on the car, he cleaned it up (heavy carbon) refitted the valve, started the engine, ok for approx 5 secs then it would cut out, he removed the valve about 5 times trying to set it up but couldnt, he does not know if there was a tension spring against the piston because the car will run if the orifice is blocked off so what is happening is that the piston is blocking the orifice but once the engine has fired up the the pressure of the exhaust gasses push the piston fully open & the engine cuts out, i cant get a detailed description of the valve internaly as Ford only show the egr as 1 complete unit with manifold so i am at a loss as to setting up of the valve & internal components, any help pls ? 2006 MK3 GALAXY 1.8 TDCI 91K ON THE CLOCK