Hi Woodio, If you want to replace the glow plug module you have to remove the inlet manifold which is a bit of a pain. If you want to find out if that has cured your problem you need to put it back on to run the engine. If that does not cure the problem your left with the glow plugs and you have to remove the inlet manifold again to replace them. I can do the job but if I any of the glow plugs shear on the way out I do not have the knowledge or the equipment to remove them. You could end up taking the cylinder head of which is expensive. !!! cheers Paneuro.