Opinions needed
My bus starts great,,, runs good 65-72 on flat or downgrade,,, when pulling a grade it will drop to 45-35 mph,,, smokes if I keep the petal to the floor,,, if I back off a quarter-inch the black smoke stops??? I get about 6.5 mpg... Is this normal for a njt-mc-9...
The detroit diesel co in Dallas,tx says it needs a tune-up,,,, this is my 3rd year running it (15000 mi )...
estimates 7-9hr labor at $102 hr. I hate to spend the money if its not needed
??
Thanks again
ps I replaced the 2 radiators and no more overheating...
ps The engine compartment reaches 280*
? could it just need some cooler air
? at night she runs a lot better....