N14 missing under load at 1400 RPMs

Check the injectors...

 

Just for future reference, cuz I know you said it doesn't miss at idle, but you can unplug the injectors individually on the side of the rocker boxes without having to take anything apart. If it's missing at idle, unplug one by one until you find the one that doesn't pull the motor down and you've found the problem cylinder.

 

It might be best for the shop to do it. Im thinking injectors too.

It's really rare for a diesel to be thirsty for fuel and when it missing, considering what diesels do to run, it's going to be the cylinder related issue. Either no air or no fuel. In gasoline engines there is spark that is needed. But Diesels don't do spark.

 

Have someone with Insite connect to it. You drive it while they operate the computer. Get it the RPM/load range the miss happens then he can perform a single cylinder cut out test one by one to see which injector is the culprit.

 

Now this is beautiful.

What about the old school number two pencil above each cylinder? If you feel one being lazy with the cruise set at 1400 idle it should show up under that pencil.

 

Injectors are easy to do on an n14. Changed a couple out in parking lots when i bought a set of junk injectors from a shop in Massillon oh. I also had a weird come and go miss that went away after i replaced the wiring harness and ecm. Both were old so i figured it would be a good investment anyway. Engine position sensor can also cause problems and i would advise anyone with an n14 to carry one and the socket to change it out

 

With older engines I also recommend putting the cooling system under a slight vacuum if you can, or at least remove the rad cap so there is no pressure. The injector cup orings will be old and brittle and easy to spring a leak when disturbed by replacing an injector. No fun to plan changing only an injector and it turns into a head job.

 

I do not understand. Can you explain that?