DEF Doser Valve

[JimT]

(03-30-2020 )amermextrucker Wrote:  Just picked up my 2015 prostar + . I will try my best to maintain the emissions system , but if I decide to move on from it which I hope is later than sooner where can i get this job done at? thx.

I did what I had to do to stay in business, but it certainly wasn't what I wanted to do. From what I've seen/read there's a few common things that lead down this road:

* Aging engine, burning enough oil and/or coolant that the doc and dpf get restricted causing more and more frequent regens.

* Neglected Aftertreatment systems. EGR, DOC, DPF, SCR parts and sensors never being cleaned or replaced until it's causing tons of issues.

* Worn out Aftertreatment components. They don't last forever and the more they are neglected, the older the engine gets and the more regen cycles they go through, the faster they wear out. Be it air flow restrictions, catalyst degradation or failing mechanical components.

My advice, do your best to keep the system clean and all the components in good working order. When, not if, you start having issues we can help you troubleshoot. Those systems are so tightly integrated that an issue with one thing may manifest as something completely different. If you reach the point of it being a loosing battle then consider your options.

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If I remember your description of that Prostar+ correctly, if it's white then I'd wager it was originally a JBHunt tractor. I had the fortune of driving a brand new 2015 Prostar+ w/ ISX (daycab) for about 6 months while I worked for them. They were replacing all the screwed up Maxxforce engines and our account happened to be ready to cycle equipment. It was a nice truck, but with only 10 gears and a really tall rear ratio, possibly 2.90 or there about, it was a little sluggish hauling anything heavy or in any good hills. Between the gearing and the different limitations on speed (62-64 depending how good your fuel mileage was) you didn't have much choice except to lug it all the time. Even if you wound it up 1600 or 1800rpm, once you shifted you were back down 1200 or so which is not a good place to lug that engine.

On the bright side, the Bendex radar systems in that model year were much better then the older generations and rarely locked up the brakes while driving under a bridge or something.

I think they were going about 25k on oil changes and our units were getting around 7mpg on average. I really liked those trucks and it's one of the reasons I only looked at trucks with an ISX when I started shopping. However, the rear end ratio and the 10 speed tranny were not going to cut it for me. And now I know that the engines probably saw a lot of abuse as a result of their specs.