Horrible Mileage - Dodge Diesel

Dougal · 04-07-2011, 08:50 PM

Hey guys new to the site for posts but not new to reading all the great posts, searched on the site and haven't found a post that pertains to my problem.
I have a 2007 mega 6.7 bone stock for deletes and performance for now. Dodge has replaced all the O2 sensors and the O2 sensors module, and still horrible mileage. I know that the over head is not accurate but it use to read 17-18 mpg when i was driving unloaded on the highway. Now it reads 10 MPG unloaded on the highway ***, does anyone have any ideas what so ever is going on with my truck? Does it just need a little time for it to clean itself out and rest itself? Any help with this is greatly appreciated.

Thanks guys.

jivemother · 04-07-2011, 09:09 PM

what are u getting if u do the math ur self ? i was getting 12 mpg deleted everything now i get 19 mpg

Gatorama · 04-08-2011, 06:21 PM

Do a search for "MAP sensor". Is the engine running rough at all? Have you used any injector cleaner? How many miles are on the clock?

Rob Mitch · 04-10-2011, 02:52 PM

Check it with a pencil then do the deletes and Smarty. It's possible but I doubt that you were ever truly getting 17-18 if figured.

Dougal · 04-10-2011, 07:15 PM

The last time I figured the mileage was before the sensors and module went for a dump. I figured it at 15-16 mpg unloaded and on the highway. I haven't hand cal since it was at the dealer. I just watched the lie-o-meter and it kept dropping. So really no need to hand cal until it gets back up to where it was before.
No it is not running ruff it runs fine just the horrible milage. As for the injector cleaner, I haven't used it in a while. Probably just a coincidence but when I did the after the first tank the first sensor went then the second time the other sensor when then that **** module. Truck only has 96,000KM on it I bought it with 82,000KM on it in Nov.
Yea I want to get it running right so I can do the delete's and let it breath properly.
Thanks for all your help guys and gonna check the map sensor connections and make sure there good and clean.

Cheers.

04-07-2011, 09:09 PM	#2
jivemother Registered User Join Date: Dec 2007 Location: lisbon ohio Posts: 238 My Photo Gallery My Classified Ads	what are u getting if u do the math ur self ? i was getting 12 mpg deleted everything now i get 19 mpg __________________ 2009 2500 sxt 4x4 full delete.5 inch turbo back . egr and cooler delete .and big smarty to bring the power 73 dodge dart swinger 340 custom rigid chopper 110 c.i. 6-speed 250 rear tire

04-08-2011, 06:21 PM	#3
Gatorama Registered User Join Date: Jun 2010 Posts: 223 My Photo Gallery My Classified Ads	Do a search for "MAP sensor". Is the engine running rough at all? Have you used any injector cleaner? How many miles are on the clock? __________________ 2007.5 Flame Red 2500 4x4 Quad 6.7L. Laramie. Stock for now except for Custom Diesel steering box stabilizer, Rancho Damper, AFE transmission pan, and an Autometer Pyro on a SRT-10 A-pillar.

04-10-2011, 02:52 PM	#4
Rob Mitch Registered User Join Date: Aug 2005 Location: Central Texas Posts: 107 My Photo Gallery My Classified Ads	Check it with a pencil then do the deletes and Smarty. It's possible but I doubt that you were ever truly getting 17-18 if figured. __________________ 2007 6.7, 3500, Single rear wheels, Quad cab, 4X4, 6 speed manual, Inferno Red, B&W hitch with 5th wheel compaion hitch. Deleted Cat, Nox, DPF, TV, EGR, EGR cooler and that plastic thingy in the intake tube to the turbo. Smarty S67ME (sw3) 7th generation Texan

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

04-10-2011, 07:15 PM	#5
Dougal Registered User Join Date: Nov 2010 Posts: 8 My Photo Gallery My Classified Ads	The last time I figured the mileage was before the sensors and module went for a dump. I figured it at 15-16 mpg unloaded and on the highway. I haven't hand cal since it was at the dealer. I just watched the lie-o-meter and it kept dropping. So really no need to hand cal until it gets back up to where it was before. No it is not running ruff it runs fine just the horrible milage. As for the injector cleaner, I haven't used it in a while. Probably just a coincidence but when I did the after the first tank the first sensor went then the second time the other sensor when then that **** module. Truck only has 96,000KM on it I bought it with 82,000KM on it in Nov. Yea I want to get it running right so I can do the delete's and let it breath properly. Thanks for all your help guys and gonna check the map sensor connections and make sure there good and clean. Cheers.