Welp, I broke down and gave it my best shot last week.. O/OP rant

TLDR version, changed out $3000 worth of injectors, didn't fix it. Still stuck in Dallas, TX. Didn't clear codes.

Long version....

Yep, started breaking down last weekend. Picked up a load in Charlotte, NC going to Dallas TX.

2020 Cascadia at 543K miles running heavy with a tanker, started throwing codes SPNI 4258, FMI 4, injector ground short to body on injectors 4,5,6. Started throwing codes last Saturday around Talladega, AL. Limped the truck to Birminghma, AL.

I diagnosed them myself with DiagnosticLink and made the call to sit at the Pilot in Birmingham AL on Sunday, wait on the parts dept Peachtree Freightliner to open Monday AM. Sunday afternoon took the top of the motor off down to the valve train.

Monday Am at 0700, Walked a mile with a backpack and bought the parts from Peachtree Freightliner I bought all the parts to change out injectors 4,5,6, rear injector wiring harness, plus the fuel lines, fuel line gaskets. 3 trips with Uber to get the spec tools (pry bar set, 12 pt 13mm socket for hold down bolt) later, got the new injectors changed out in the Pilot parking lot. Walked back and got to it. Everything put back together 1500 Monday.

Changed everything out, reprimed the truck, added the new reman injector codes in Diagnostiklink software, rewrote the MCM for the new injector codes, drove up to the dealer and gave them back my cores for the 375$ each credit, and proceeded to Dallas TX. 690 miles.

Set the cruise at 68 and sometimes had to step it up a little every now and then. Got to Dallas and delivered that load. Truck ran like a scalded dog, thought I had it fixed.

As soon as I got back on the Interstate, bam, threw the codes again. That means the harness is shorting outside the motor, or it's a computer (MCM) issue. I cleared the code once again so I wouldn't be de rated and could get down the road.

I got to the tank wash and shut the truck down, then confirmed my wiring harness had continuity from injectors pins to MCM, then called Freightliner Dallas South and put the truck in there to get the MCM changed out. ON a Friday morning, and that was something. That's not gonna happen. On a Friday. AT Dallas Premier Truck Group South. We ain't gonna get a competent tech on it till Monday.

So I'm sitting here in a hotel in Dallas, Freightliner Dallas is twiddling their thumbs because the code ain't active. Of course they run a skeleton service crew on Sat and Sundays.

When I uber to the dealer Monday morning I'm gonna tell them to hell with diagnosing. Just change the MCM, I've already diagnosed it. And I'm losing 1100$ worth of revenue a day. Change the part, let me out of here.

That way maybe I can get out of this hotel at $110 a night.

 

Thanks..

I knew coming into O/OP side of things my old 550K mile Cascadia is going to cost downtime....

And again, this post is just a RANT, so I can just blow off steam.

When I look back at what this is really gonna cost me, every week is about $7K gross, so sitting for even a weekend is painful.

I'm thankful I have everything paid for for the next month.

 

I ohm'd it myself, and all pins showed continuity.

What would you suggest to do wiht my time and money?

 

Thanks fo the advice, Harness is $750, I'll tell them to order that too.

 

That actually gave me quite the laugh, and I needed it.