04 model year trucks, are they all egr?

Caterpillar did not use EGR, Acert engines are not EGR engines. As far as I know all others were EGR by 04, some as early as 2002 (maybe even earlier?).

 

Acerts had some issues, but in general have less problems than the EGR engines. The regen ones should be avoided, tons of issues with the regen system. The 2004-2007 without regen were decent. They had injector harness issues, a rocker stud update due to studs breaking, compressor inlet hose update. They have intake actuator issues, mostly caused by the injector harness failing, but the actuators do fail.

Once the updates are done, they're reliable engines. BXS, MXS & NXS are the prefix's. I've never had a BXS, but the MXS and NXS's are pretty much the same.

 

Most '03 and some '04 CAT's are the dreaded single turbo with MBN serial # prefix. Most '04 CAT's were ACERT twin turbo. Some early '03 CAT's were prefix 6NZ single turbo - the so-called "last of the good ones". MBN is the one to avoid at all costs unless it has been maintained well (documented) in a clean truck, checks out good, lower miles, and preferably "upgraded" *cough* *cough*. I'd take an MBN or ACERT CAT over any EGR motor. If I had none and were shopping I'd look for a 6NZ.

 

Or back just a little further and get a 2WS.

 

CATs on 04 trucks are mostly mbn, mbl and acert bxs. detroit and cummins had egr on 04 trucks. my mbn is fine, soon to be converted into a 6nz engine.

 

The polution rules stared in 1970, and all the engines talked about use EGR even Cat they do it using cam timing.
Just a thought!

 

Detroit/ Cummins built after 10/1/02 is erg... Cat after this date is MBN. not clear on date of Cat Acert