Caterpillar C-15 ACERT runs rough after sitting 8+ hours?
This question was actually asked to me by another Owner Operator:
I have a '05 ACERT that has about 45k miles on a platinum inframe thru Pete in Grand Island, NE in October '11.
Since the rebuild I've had an issue that three Peterbilt dealerships have been unable to find. All they do is come back to me after a couple of days (my local dealership in Oregon had the truck for 10 days).
The problem is that when I have the engine off for 8+ hours. When I start the engine it runs smoothly, and when I rev it up in neutral its smooth. It's only when the engine is under a load (bobtail, empty or loaded doesn't matter it). I get a severe stutter/miss and it blows blue smoke when I apply about 1/2 throttle or more for only about the first 5-7 miles then it smooths out and runs like a champ.
I've tried letting the truck warm up to operating temperature (water 170-175 degrees, oil to 150 degrees, trans at 150+ degrees before pulling out and it still does it.
I'm thinking maybe? a injector cup? The dealerships have done cylinder cutout tests, fuel pressure tests, and all three have come back to me going "yeah.. it does what you said it did but we don't know why". then wanted to charge me labor for nothing. The engine is still under the 4 year unlimited mileage parts/labor warranty.
Hopefully you can help?
Is this a good question?