Misfire or broken parts 6.5 diesel

[Bulldog04!]

I’m sure it’s been asked or talked about. I have a 1994 6.5 turbo that was a good running driving power train doner put it in another rig when it was out put new bearings in the bottom end and put together other pickup. Started it and it has a heck of a vibration kinda like miss fire but vibrates the dash and all I’ve cracked 6 out of 8 injectors and have fuel. Pmd is relocated etc. like I said it was a good running power train outside of getting new bearings. I’m at a loss what to look for the other two injectors are right behind the turbo is why I haven’t bled them but any help would be great

 

[ak diesel driver]

You swapped engine and trans together? Sounds like it could be a balance issue. First crack each injector loose one at a time while the engine is running. Be careful of high pressure spray as it can inject into your hand and cause a very bad day. If you find one that doesn't make any difference if it's open or not then that cylinder is one to check closely.

 

[dbrannon79]

Verify the harmonic balancer is in good condition, they are engine killers and like to snap crankshafts. also the flexplate too. was there anything pulled apart or loosened on the engine during the transplant like the IP or timing components. These engines are externally balanced.

if the HB is good and timing wasn't messed with, then I would install a clear hose on the IP return to check for air in the fuel. also make sure you have good pressure from the lift pump. check all 8 injectors for fuel like said above.

did you keep the same ECM with the transplant? maybe there is something with that too depending on what the engine came out of.

 

[MrMarty51]

What flywheel/flex plate did You install ?
If it was not specific to a 6.2 or 6.5 then it will be out of balance.
But IDK if a gasser unit would mate to a 6.5 diesel.

 

[Will L.]

What flywheel/flex plate did You install ?
If it was not specific to a 6.2 or 6.5 then it will be out of balance.
But IDK if a gasser unit would mate to a 6.5 diesel.

Gasser flywheel has wrong teeth count & will not function with the starter.

I am leaning to air in the fuel system.
Follow the above for it. Also, out the front/top of the ip (injection pump) is a 1/4” diameter fuel hose about 5 or 6” long, in an upside down “U” shape. Replace that hose with clear tubing. If in a hurry, hardware stores sell clear pvc tube by the foot. Buy screw type hose clamps for it as the factory spring style won’t work because the clear tube is thicker material. If you can wait a day or two- buy some from Fuel-line.com (has to have the dash in name) because that is actually fuel line and will withstand the ethanol that is in all our diesel fuel nowdays and will last many years. The hardware stores sell clear stuff lasts a few years and needs replacing.
The purpose is to see contamination in the fuel, see that fuel is flowing through, and that there is no air intrusion occurring. A small trapped bb of air is ok. Any flowing bubbles indicates a leak somewhere that is sucking air in.
Leave the clear line in permanently. Any time there is any hiccup, a simple glance tells a lot- it is the first step in GM’s diagnostic flow chart.

If you can, make a video- post it and we can see more of what’s happening. If you can’t post it here- YouTube or similar then post a link.


Once this is solved- take time to learn more here, we can save you thousands of dollars and tons of headaches. There is more to help the fuel system and other things but for now, one step at a time.