Posted by charles todd on September 23, 2009 at 18:00:49 from (205.242.95.136):
I posted a few days ago with a nasty engine knock. Drained the tank sump, fuel filter housing, and replaced the fuel filter hoping that I had a water related problem. I did get SOME water out, but not as much as I expected.
I messed around with it some last night and found that it would knock and miss at lower RPMs while belching black smoke on each miss. It runs fine 1/3-1/2 throttle up to WOT. I put a healthy dose of Diesel Kleen to it and ran the hell out of it for about 3 hours. It ran like a top, after of course knocking after start-up.
I did not shut it down to a low idle, but cut back on the throttle to cross the creek on the way back home and the knocking/missing started again, but sounded a little different with a 6-9 ceatane rating boost. Got the RPMs back up and it cleared out, no smoke or noise.
Either I have an injector not seating/leaking/stuck or the injector pump is failing? Would these be the route to go? I know injector OH is MUCH cheaper than an injector pump OH, but are either at fault? Runs fine flat out, but knocks like a MFer at lower RPMs...
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