Hi all,first of all the car is a C4 1.6 hdi.I trusted a local garage to change the little timing chain between the two cams as the adjuster failed.Firstly they claimed one of the injectors deteriorated getting it out,secondly then the starter motor just packed up.But I know these things happen so after A £600 + bill the car is now running like a bag of hammers when it does start I know the lad that said he done the timing and he is damn fine mechanic and he said it's impossible to get it wrong.I trust his instics.The garage is blaming the second hand injector but is deffo firing on all 4 cylinders.I'm not a mechanic but when it's turning over it doesn't seem to have all the compression.and when it does start it's as flat as a fart.Any ideas please