Caterpillar running rough

maybe the ecm.. my buddy's cat/pete did the same. cold start run like sheetz for 30 minutes. then run fine. it turned out to be his ecm.

 

1st thing that comes to mind is a bad injector. I would either get a Thermo heat gun and check temps on all the cylinders when it is missing, they should all be about the same temp, the one that is not is you culprit. Or unplug the injectors one at abtime. When you unplug an injector and your miss goes away, you found the bad injector.

 

Definitely use the heat gun trick. Sure fire way to diagnose a poo poo injector

 

Things are not the same as they once were. People got divorced and it was done. Now they get remarried and or just shack up. Some live happily ever after or not.
Point being a piece of paper does not fix the problem.
What is the code that goes with the check engine light?
Many loose the thought of what would cause this if there was no computer. Sight glass in fuel line to check for air is a good start.

 

What is your fuel pressure off the filter head when it is mucking up?

 

If the engine light comes on, there should be a fault associated with it. CAT is pretty good about logging every event a fault code. The shops that scanned it, did they give a printout of the logged faults and events? Where the using CAT ET to read the ECM or just a generic scan tool?

 

That ecm is cooled by fuel .. it’s possible that leak is allowing air into fuel system. Mr Haney told a member to bypass fuel line and put a stand-off behind ecm to move it away from the block to allow airflow behind it.. ecm is unrepairable if leaking fuel and expensive. If you get a year or 5 extra with his fix it seems worth it.

 

Small fuel leak= lose of fuel prime, hard start, and white smoke.