Posted by RodInNS on January 20, 2014 at 09:49:42 from (216.118.158.123):
In Reply to: Ford 5000 knock posted by Dale M. Alsum on January 20, 2014 at 07:38:29:
Could be an injector... could also be plunger springs in the pump... or an internal problem in the engine. Blown piston, burned valve, etc. Usually a burned valve will make a sput/sput from either the exhaust or intake depending on which one is burned. I'd start by cracking injector lines open one at a time at idle and listen to see if there's a change in tone or drop in speed with the line open. When you find one that doesn't cause a change, or as much change, you found the problem cylinder. At that point you want to pull an injector or two and either do a compression test or swap the injector to another cylinder and see if the problem follows the injector or stays in that hole. If it follows, then the injector is at fault. If it doesn't follow... then you do a compression test on that hole and see if it's got 350 psi or so... Given the description I think you'll find a bad injector or a tip blown off. If that's the case it could be dumping fuel into that cylinder while you're running it... and washing the walls down... and mabey accumulation fuel in the base oil... so don't continue running it until you know what's wrong at least.
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