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I have an update: The fuel system was not the issue. I checked everything and still the same issues I recently learned how to use the transmission light to get codes and got code 71. After I got this code I replaced the engine (crankshaft) speed sensor but it did not fix my issue I still...

Usually let the glow plugs cycle at least 2 times. Then crank it. It take a while for it to go. No easy task to turn on.

Awesome! I'll start doing that! Hopefully it works. Thank you so much

Yes It was driving fine. It was cold (12 degree). So the initial thought was fuel gelling.

Really hard to start in cold. When it finally starts, it revs fine. All of these with lots of smoke. When in drive, sluggish and more smoke.

I appreciate the responses. I am here to learn. 👍🏻

Runs poorly with a lot of smoke. When in park, it revs fine.

Yes, it moves when in H but sluggish. When in HL, same as when in H. It moves sluggish.

Thank you for your reply. Yep, I am really new to all of this. I am a little mechanically inclined but not experienced enough with hmmwv. When I put the transfer case in H and the transmission in overdrive, there is no enough power. It is sluggish.... When I put the transfer case in LOW and...

Thank you for your reply. I checked the fuel lines because it was seating for almost 2 weeks in 12 degrees. The original thought was that the fuel gelled up. But unfortunately for me, it was not that easy. Could you please elaborate more in your answer. It make sense but I have no idea...

I am having issues with my hmmwv. When in H and drive it has no power. As if there is not enough compression for it to go. I accelerate and nothing happens. When it is in LOW and drive, it goes. I already checked the return lines. I blew air in them and they are fine. I also changed the fuel...