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Discussion Starter #1
2011 LML less than 200,000 miles had head studs and gaskets done last year . was driving 45 mph unloaded started to rattle then hard knock found 4 inj codes pulled injectors set to a place FLA. 5 were bad replaced 5 they rebuilt the other 3 no metal in them they said. installed still knocking no codes it's a hard knock it has had the EGR deleated and big exhaust from turb back. it does have a slite exhaust leak at the turbo haven't fix yey just in case it needs to come out, idles a little rough but smoths out just off idle but still knocks hard. new fuel filter and fuel injectors
 

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Have you checked for any codes?
 

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Discussion Starter #4
I think it's called florida injection, no codes hard knock should the harm ballancer be smoth or do they wobble a little. I 'm a retired GM master tech ( retired / broke my back in 2013) and just can't remember any more lol. MY scaner won't let me cancel the inj. cause it shows vehicle speed on scaner and the speedo does jump up to like 3 mph when started
 
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