ponyboy Posted January 3, 2013 Share Posted January 3, 2013 hey guys im working on a 1999 f250 with a 7.3 it has a knocking sound from cly 3 when i unplug the injector noise is gone i replace the injector and no change removed both valve covers seems like all 8 injectors and glow plugs have been replace already but #8 has the same part number ass all the other injectors any ideas of what to check? Quote Link to comment Share on other sites More sharing options...
Aaron Posted January 3, 2013 Share Posted January 3, 2013 Rod bearing? Quote Link to comment Share on other sites More sharing options...
mrbudge Posted January 4, 2013 Share Posted January 4, 2013 Bent rod. Especially if it puffs a little blue smoke. Any flooding in your area recently? Quote Link to comment Share on other sites More sharing options...
ponyboy Posted January 4, 2013 Author Share Posted January 4, 2013 no smoke runs realy strong just a slight knock at idel i found that i have idm codes for all cly so ima try to find a tester idm is there a posabilty that the idm is leveing the injector open? if i unplug cly 3 the knock is gone Quote Link to comment Share on other sites More sharing options...
joshbuys Posted January 5, 2013 Share Posted January 5, 2013 I've got a 99 that I just put heads on 2300 miles ago, along with all 8 injectors and glow plugs. It came back in knocking, they tried to blame it on me, but I didn't make the piston ring come apart. Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted January 5, 2013 Share Posted January 5, 2013 '99's have the worst design air filter and dust engines frequently. I have one I took apart with a full 1" of upper ring gap (no joke) and a trashed piston. (I think I posted pics of this years ago) Always be suspect of dusted 7.3's, twice as suspect on '99s. Quote Link to comment Share on other sites More sharing options...
ponyboy Posted January 10, 2013 Author Share Posted January 10, 2013 ok ill check that guys Quote Link to comment Share on other sites More sharing options...
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