Poor Preformance all at once on long haul

[Rapter554]

I just drove from Colorado to Missouri with a full load of horses. 2003 Duramax 6.6. with 120,000. On the drive the truck started to shift hard, loss of power, dropping fuel mileage, and much more engine noise.

I just changed the oil to Valvoline Full synthetic 5W40 could that be the cause? Or the injectors going out? Or the change of in altitude?

Any thoughts are appreciated as I am headed back tomorrow, and would like to know if its something that is going to be a problem.

Thanks

 

[PhilsLB7]

When was the last time you changed the fuel filter?

 

[jkholder09]

Is there fuel in the oil?

from mobile

 

[Ne-max]

Check engine light? Any codes?

 

[Rapter554]

I changed fuel filter last year, or 10,000 miles ago. No lights, codes not known,

All gauges in normal range.

 

[Rapter554]

no fuel in oil that I can tell

 

[PhilsLB7]

Sounds like you need to change the fuel filter. I would get one and put it on before your return trip.

 

[jkholder09]

Air filter as well maybe?

from mobile

 

[PhilsLB7]

Air filter as well maybe?

from mobile

Something that's easy to check, that's for sure. :thumb:

Don't always trust the air filter monitor. Open up the filter box and physically look at the filter.

 

[TLyons90]

X2 on changing your fuel filter before your return trip... If after that and having the same issues you are def going to want to check your injector balance rates for injectors going out!

 

[Rapter554]

Thanks for the help!

I changed the fuel and air filters, and it took care of the problem. Truck ran great on the way home.

Just want to say thanks for your thoughts and quick responses.

Thanks You!

 

[PhilsLB7]

Good deal :thumb:

 

[ALLY Fox]

It's always a good idea to carry an extra fuel filter (and tools to change it), especially when traveling. Never know when you're going to get a crappy load of fuel. Also, good idea to save the old filter and cut it open to see what kind of junk is in it. Could make you change where you usually fuel up....

 

[TROJAN366]

The answer is always check your fuel filter! Good to hear you're back up and running.