C cummins2132 New member Joined Aug 13, 2014 Messages 65 Oct 26, 2014 #1 ok I had high rail pressure at max which was 28k at idle I fixed the high rail pressure but I still got a nasty fuel knock. it puffs out black smoke at idle is it a cracked injector or what.
ok I had high rail pressure at max which was 28k at idle I fixed the high rail pressure but I still got a nasty fuel knock. it puffs out black smoke at idle is it a cracked injector or what.