2010 ISX spits when pulling a hill.

Mine does it to. It's the cap on the anti freeze overflow tank releasing. It only holds 5psi of pressure. Get a new one. I'm positive that's what it is. A mechanic told me that by governing those engines they made them run hot. They have all kinds of water leaks.

 

The fuel smell is raw fuel dumping because, again, of the engine governing. I'm almost sure it has nothing to do with the spitting noise. It all just adds up over the course of the day after the engine starts running hot.

 

Have the EGR checked. I would also have someone look at the EGR cooler. This will give a good indication of EGR performance even if the computer indicates nothing is wrong.

The smell of raw fuel could be the injector in your DPF is malfunctioning. You may have a combination of issued, or one single one.

Good luck!

 

my N-14 used to do the same thing when i got a new ecm...

 

You are describing a bad egr valve. That is the first signs of the bad valve.

 

what he's describing is a backfiring out the intake valve. if you can catch it at night. you'll see fuel spitting out the air filter.

except you probablhy only have one and it sits under the hood. which is why your smelling raw fuel.

it happens to me every 40,000 miles. new air filters fixes the problem

it's probably time for a overhead which is next on my list of maintanance

my egr tests out good along with the cac and turbo actuator.