2003 Chevy Trailblazer LT reman engine diesel upon shutoff

[Skidddmarkzzz]

Just had a reman Jasper engine put in my 03 Trailblazer and it runs smooth, except when I turn the truck off, it diesels. Does anyone have any suggestions as to what could be causing it? Any help would be appreciated. Thank you.

 

[NJTB]

Probably something with the fuel injection. When you turn the key off it cuts the fuel off. No fuel, no dieseling. Leaky injectors?
It's funny that since it's a new engine it does this. Dieseling requires a hot spot (carbon) in the cylinder for ignition. Maybe some Seafoam?

 

[Mooseman]

Agreed. Check the fuel pressure at shut off. If it steadily drops, I would suspect a leaking injector. Another possibility is a defective pressure regulator allowing too high pressure and overcoming the injectors. It should be around 55 psi.

 

[Skidddmarkzzz]

Probably something with the fuel injection. When you turn the key off it cuts the fuel off. No fuel, no dieseling. Leaky injectors?
It's funny that since it's a new engine it does this. Dieseling requires a hot spot (carbon) in the cylinder for ignition. Maybe some Seafoam?

We had all new fuel injectors put in.

 

[Mooseman]

And what's the pressure like I asked?

 

[Skidddmarkzzz]

I don't know. I have to take it back to the shop that installed the engine and the injectors. I was only asking to see if there were suggestions that my husband could check or address.