Fixed! Is your 6.9 totally gutless? Mine was until...
#1
Fixed! Is your 6.9 totally gutless? Mine was until...
For the benefit of others:
My 1986 6.9 was gutless. Completed unloaded it could barely do 55mph up a nearby 8% grade. I never really watched the speedometer because my truck was just slow. I stayed in the slow lane; let traffic pass me on the 2-lanes...I was just the slow old truck. I had replaced every part of the fuel and ignition system and that almost entirely eliminated the clouds of smoke I was leaving everywhere...but nothing improved torque or speed. I had resigned myself to the assumption that the 6.9 was just a weak engine.
And then I blew a head gasket. So I had the heads rebuilt and put it back together. (By the way, a head gasket that is about to blow out will create a strange "paper sounding" tick in the engine. Kind of like cylinders with no oil but the ticking sound seems more like paper than metal)
And now...
WOW!
IT'S A COMPLETELY DIFFERENT TRUCK! I now fly up that hill at 75mph if I'm not thinking about it. My average cruising speed on the highway at 2500rpm in 4th gear went from 60 to 80. I now have to intentionally reduce my speed and be careful about speed limits.
Not a single repair to the truck has left a greater impact. It was a pricey fix; but man was it worth it. I finally have some decent power out of this thing!
Also, beware: More power can create more problems. Due to that power improvement I quickly burned out my old clutch. Undesirable, but a good problem to have.
New gasket and head rebuild FOR THE WIN!
My 1986 6.9 was gutless. Completed unloaded it could barely do 55mph up a nearby 8% grade. I never really watched the speedometer because my truck was just slow. I stayed in the slow lane; let traffic pass me on the 2-lanes...I was just the slow old truck. I had replaced every part of the fuel and ignition system and that almost entirely eliminated the clouds of smoke I was leaving everywhere...but nothing improved torque or speed. I had resigned myself to the assumption that the 6.9 was just a weak engine.
And then I blew a head gasket. So I had the heads rebuilt and put it back together. (By the way, a head gasket that is about to blow out will create a strange "paper sounding" tick in the engine. Kind of like cylinders with no oil but the ticking sound seems more like paper than metal)
And now...
WOW!
IT'S A COMPLETELY DIFFERENT TRUCK! I now fly up that hill at 75mph if I'm not thinking about it. My average cruising speed on the highway at 2500rpm in 4th gear went from 60 to 80. I now have to intentionally reduce my speed and be careful about speed limits.
Not a single repair to the truck has left a greater impact. It was a pricey fix; but man was it worth it. I finally have some decent power out of this thing!
Also, beware: More power can create more problems. Due to that power improvement I quickly burned out my old clutch. Undesirable, but a good problem to have.
New gasket and head rebuild FOR THE WIN!
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