CAT C15 /6NZ trouble continues

Truck, I had issues with a few trucks in my time, a few had ghosts bad enough to cost me more than the value of the truck - I won't explain that.

A few thoughts.

The OEM connector on one truck was a cause of nightmares after an accident. It was replaced and the problem went away.

On another truck, it was a big nightmare and I had to fight Cummins to get help. Cummins had a tech come out to where the truck was broke down and put in a diagnostic harness in between the OEM connector and the ECM with a computer to capture all the data going in between them (plus the sensor data), he located the issues within the truck cab with a bad harness. The harness was replaced under warranty, it was a huge fight to get Western Star dealer to do that, it cost a lot of money and stopped my driver's nightmares. This one would show high temps and high boast - both gauges are driven by the ECM.

Another truck had ground issues, it was a beater truck so I paid a friend's mechanic $1000 to go through all the ground points in the truck and put in additional ones, it ended the problem but a year after that, the truck was hit hard in a parking lot by some hot shot dude and the insurance company totalled it out.

I talked to the Cummins tech about the harness and the computer, he said it isn't used often but when there are issues like I had, it makes a big difference. I Know cat has the same setup for their stationary engines and their earth moving engines. He also said they have one that plugs in between the ECM and the engine harness.

hope that helps.

 

That's great news!

 

Cat tech is at my shop right now replacing injectors. I think Swaan is right...there is evidence of combustion leaking past 5 of six injectors on my engine. if you read this Swaan, I'd like to know more about this tool, and figure out a way to get this procedure done. I'll run my truck with these new injectors but I'm thinking it's going to come back. F me

 

ever been to Alberta Canada? lol...it's really nice up here in the summer

 

update...all the injector seats are bad and leaking combustion gases into the fuel rail. Cat is replacing the head on warranty.

 

I'm wondering if the high water temp issue and the stumbling aren't connected in my situation. I will certainly know in short order once this repair is completed. I asked the tech if the failed seats would have an effect on water temps and he said it's surely possible, but to what extreme he wasn't certain.

on a 25C day with a 100,000lb payload I can walk my water temp gauge to the pin with the fan on if I keep my foot in it climbing a long hill in the basement gears. I back out once it hits 230 degrees and keep the boost below 20psi at high rpm and it will stop climbing.

the rad has been removed, flushed, and cleaned once it started doing this and hasn't changed anything. next is a high efficiency model if this latest work has no effect. the T800 has a smaller rad and Cat would not perform the 475 to 550 bump on models running below a certain latitude due to cooling issues in warmer climates. maybe global warming is the culprit.