2014 Hino 258 P140D

[rgf451]

2014 Hino 258 with 141k miles. Setting code P140D burner misfire. This truck has had everything replaced according to the burner maintenance thread about 25k miles ago. Where to start with this? Just check all the items one by one as the diag steps would indicate?
Thanks

 

[likemlow]

I would pull out the Atomizer nozzle first and inspect for clogging. Then pull the Igniters see how they look.