John Deere 4045t running problem

I have a jd 4045t. I bought the engine out of a sweeper truck that had been sitting for a while. The engine would not start. I determined it was not getting fuel. It has a stanydyne pump. I took it to our local diesel shop and the pump had a lot of rust and crud in it. We installed a new pump and injectors. Flushed the lines and hooked it to a new fuel tank. The engine won’t start without a shot of ether and develops a miss at 2/3 throttle. Plenty of fuel and pressure to the pump. The keyway is good and tight in the pump gear. Have rotated the pump away from the engine. Still takes ether to start and the miss comes in sooner. With the pump rotated towards the engine it still takes ether to start but the miss comes in later. I have pulled the timing cover and verified gear train timing. It is spot on where it should be. I have taken the pump back to the shop to be checked out just in case something was built wrong with it. If the pump checks out I am at a loss where to go from here. Any input would be appreciated

Which pump stanydyne pump. DE10?.

I believe it’s the b4? I dropped pump at shop today so I don’t have it in hand

So on wire to the fuel solonoid, one wire or two wires into the back between the injection lines? Any metal lines in the fuel supply to the pump will have grommets and they deteriorate , check them all. Also check the fuel filter cap orings if so equipped.

One wire to solenoid. All grommets have been replaced. Bypassed the filter and mechanical fuel pump to eliminate the possibility of either of them

10 4 just trying to cover the simple stuff. If you have not already done so check the return line to tank. Also when timing the engine to TDC make sure to turn the engine in the direction of normal rotation. Maybe MG will chime in, he will want the engine serial number.

Thanks. Return line is good. Brought it to tdc in engine rotation . Checked it twice.
Pulling my hair out on this one. Have worked on several Diesel engines over the years. Never had one stump me like this. This engine is to run a hydrostat unit to run a force feed pump. Our main pumps engines are 855 Cummins. Have always been able to figure any issues out with them. This engine doesn’t seem any more complex than the big Cummins I am used to. I have been over this thing a dozen times. Keep thinking I am missing something.

Are we talking "New" new injectors, or remans?

Any difference in cylinders with an IR temp gun?

New not reman injectors. New not rebuilt pump. Cylinders all even on temp and compression

Did u actually do a compression test or are u going by even temps??
What were the compression #’s??

Just theory , it is possible one if the injector tips is stuck open allowing compression to pushed into fuel , or a tip is clogged making incorrect spray pattern. It would seem either condition could cause the miss , or possibly a slight fuel knock, to move with the timing changes you made at the pump.

Also I suppose, an injector with a low pop off setting could cause advanced timing on that single cylinder. But I got a feeling you are gonna tell me you already had the new injectors tested.

Serial number please. Are you running this engine on a stand? Is this engine actually connected to anything at the moment? When it misses is it smoking? If it is not connected to anything it may sound like it is missing from not having any parasitic load on the engine. Maybe post a video of it idling and then run it up to the misfire so we can see and hear it.

i would check travel of push rods may be one lobe on cam not right. ever thing you have done may be right, (dont keep doing same thing and expect different results )

I just fixed a 4045HF285 that was not running right. It did not want to get to full rpm and it was low on power. Long story short - injection pump timing off 1 tooth and the camshaft was worn out well past limits. Evidence and verification of new parts told me that the engine had just been rebuilt with new bearings, liners, pistons, etc. Probably why it was sold off - did not run right after rebuild.

Simple things cause big problems. Another 4045 was low on power - bad ground to battery and rubber seals in the fuel injector lines were bad allowing it to suck air. I've been told the ones with electronics are critical to have good grounding.

My old 6068T went down on power. Another simple fix - the intake came loose and lost compressed air. It lost almost all power.

Does it have a lift pump?