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Jeremy, Certified Truck/Bus Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 3382
Experience:  ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, EPA 608/609 HVAC Certified, Steering/Suspension and ABS/Brakes Technician
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I have a 2005freightliner Columbia with a 14 liter Detroit

Customer Question

I have a 2005freightliner Columbia with a 14 liter Detroit egr engine. I'm only getting 4.8 miles to the gallon
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Jeremy replied 1 year ago.

My name is ***** ***** I will assist you.

Fuel mileage can be so many things...

Alignment is good? Ride height is good on the air bags? What about trailer, is it good? Alignment good? No scrubbing going on from dog legging?

EGR checks out good? There are no issues going on there? Turbo actuator adjusted properly? Good air getting to the vPOD with no moisture getting to it?

When computer is hooked up, are all your pressures good? No high counts above 116 on the Delta P sensor?

This list can get really long really quick, but these are what can affect fuel mileage right off and the most common.

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Customer: replied 1 year ago.
all of these things were checked
Customer: replied 1 year ago.
I also don't have good acceleration. don't pulls hills good at all
Expert:  Jeremy replied 1 year ago.

That sounds like a EGR issue or a EGR cooler plugged issue. Maybe even the CAC.

Check a couple of things. On the intake, remove the baro and boost sensors. See if there is soot on them. clean them up with a small brush and some MAF cleaner. Put back on. Then cehck to see if he truck seems to boost up better. If not, then have the CAC pressure tested, the EGR cooler tested, and remove the EGR, soak it in mineral sprits, use a round 9mm gun brush (it fits perfect next to the rod) and clean the shaft on the EGR. Put back together and see if you get your power back.

Expert:  Jeremy replied 1 year ago.

Do you need any more assistance with this question? You can close it on your end if completed and return later if needed. Thanks.