i have a 2007 924g loader. It has developed a sudden knock. I did have cat come down and check the loader, to no success. They figured it was the lift pump, which i replaced. It did not change the spuratic knock that was occuring. We cracked the injectors, obvious idle changes occured except when cracking cyl. 2 & 6. Injectors were changed, worked the machine for 1.5 hrs hard and it seemed ok. Then at idle it started again. It comes and goes. It's one of those ghost problems. Fuel system ( filters, separators ) are very well maintained as this is my primary work horse for winter snow removal. It's best desribed as a " clack clack " noise, somewhat reduced power, very noticable when in 4th gear trying to accelarate. My next step is to try to get fuel from a 5 gallon bucket ( extremely clean bucket ) to rule out a filtration or fuel issue. Has anyone encountered this type of issue?
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