Diesel Forums weighs in on the 6.7L Cummins

Gotta Love ‘em…

I had the opportunity to query some diesel owners on the various Dodge diesel forums; about their experience with the new 2007-2008 Dodge Ram 2500-3500 Cummins 6.7L.    Kurt was kind enough to fill me in on his understanding of the recurring problem of the check engine light and the poor fuel economy.  “I have experience with all of the Big 3. Ford, Chevy, and Dodge.  For the DPF, I’ve found the best way around that is to delete it.  I’m sure this isn’t something the dealer would suggest or do, but… it saves alot of hassle and keeps the same vehicles from coming in the shop for the same reasons day in and day out.” 

Now being that I am intimately involved with dealerships and factory-trained technicians, I’d like to think Dodge has the software fix for this issue, (2008’s don’t seem to be as bothered as 2007’s) because removing it would most likelyvoid the warranty, but everyone has their own interpretation of how to make the most out of their truck. 

For those who don’t know…The DPF isa self-cleaning diesel particulate filter incorporated into the exhaust system built by Cummins Emissions Solutions. The muffler is isolated from the emissions control system, allowing customers to remove the muffler without impacting emissions compliance, Dodge said. The emissions system is designed for a government-certified 120,000 miles.  It’s the clogging/fill-up of this filter that sends the truck into spasms, poor drivability and back to the dealership.

When I asked about the fuel economy, here is what Kurt said; ” Adding an intake exhaust and a little programmer with the right driving manners will make the 6.7 more fuel efficient.  Also, if the owners will break them in like they are going to drive them everyday that will be a big help. IMHO if the owner would buy the truck right off the show room floor and go hook it to a 15,000+k pound load that will help out with fuel mileage long term. Usually a Cummins or Duramax won’t start to get its mileage up until 30,000 miles or later.Problems.  “In [the Dieselforum.com] stock forum we have seen alot of great things from the 6.7 [Cummins].  If it where not for the DPF filter they would be pretty jammed up trucks.  Note: Dodge isn’t the only one with the problem. I have seen alot of Fords having alot of problems also.”

Recent posters have commented on their 2007 models visiting the dealerships upto 15 times, in an effort to replace turbos, DPF filters, and exhaust hardware. In many cases the software “flash” upgrade has made a significant improvement in the driving behavior of the trucks, while fuel economy slowly rises.  Don’t give up, the factory and Cummins are working on this.

Sarah Lee is an automotive executive with 20+ years of experience. She writes about Cars, and is a staunch consumer advocate on car related subjects. Her company: MY CARLADY is a car buyer’s service committed to getting you the best deal on your next new or pre-owned vehicle. You can reach her at www.mycarlady.com

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