HELP!!! Even the mechanics can't figure it out.
I have a 1999 International 9900i with a Cummins.
The other day it started cutting out in high gear and blowing black smoke. It feels like the motor is trying to jump right out of the truck as soon as you get it up over 30lbs of boost pressure.
As long as you are not trying to get power out of the truck it runs fine, it just acts up when you are putting the fuel to it.
The first time I had an issue similar to this a fuel filter fixed it, but not this time. I put it in the shop and after 2 days they cannot figure it out.
I had 2 valves out of adjustment that they fixed, then worked on the fuel system bypassing everything, but this did not help. Then we checked the air system, making sure all the boots were good,
there is a pin sized hole in my air charger cooler, but they say that that should not be causing this issue. Also the fuel pump is working fine.
Recently I had to replace one injector, but the truck has been running great since then.
Does anyone have any ideas???? I am desperate.
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