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I have working on these engine for years in Mercedes and there has been various chain / tensinosrs failing . Recently I have had 212 651 engine camshaft sporket break into preices damaging the drive gear at the back . Engine has been rebuilt with genies Mercedes parts . Problem is engine back in car cranked over started ran for about and minute and now won't start . No fault codes timing rechecked .rail pressure goes from about 280 upward . But injectors don't open replaced injector rail tested all wiring but still no fuel plenty pressure at pipes when cracked . And also runs on the old go go juice but just won't open injectors .
Anyone every come across this . Confused as Ano the older engine shut injectors of if rail pressure too high at start up but does this engine do this as well . Also tensioners common for rattle at start up try first before replacing chain easy job
You may need to bleed the injectors/rail via a star machine.