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Custom Dodge Ram Performance Mods - Engine - 5.9 Liter V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!


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  #1  
Old 10-04-2010, 04:22 PM
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Default Fuel mileage

Ok guys, I know I drive a truck so I do not expect any spectacular fuel mileage, and I also know I drive a Dodge truck with a 5.9 Liter gas engine which are notoriously bad for fuel mileage so I am not expecting any stellar fuel mileage ratings by any means, however, I am getting a little concerned because my fuel mileage has been slowly decreasing over the past few months. When I first got the truck with no mods except for a cold air intake I would get 14-15 on all highway if I was lucky and an average of around 12 city and highway, which I didn't mind. I put a leveling kit and 33" X 12.50 Dick Cepek mud country tires on my truck in late July and I knew my mileage would take a small hit but I didn't expect much. On a 6 hour all highway drive to north Carolina I averaged 12.5 mpg. I got a motorcycle and didn't drive the truck much after that, it's getting colder now and I will be driving the truck more often. I just took a trip to a Maryland football game on Saturday, about an hour and a half round trip, 95% highway, and I averaged 10 miles per gallon...that's my main concern. If I'm getting 10 mpg on all highway...I hate to see my city mpg which is mainly all I do, and then when it snows and I'm using 4wd this will dip even lower. Not too comforting for a broke college student. I also tow my friend's jeep occasionally to Rausch Creek for off-roading trips I hate to see the gas mileage when I'm towing 6500 pounds...any help would be much appreciated as I said I have the cold air intake but other than that it's my only performance mod as of now. Also, as I said I realize I drive a dodge truck so I will never have "good" fuel mileage, I would just like to get back where I was or at least somewhere close. Thanks in advance and sorry for the book-long post.
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Old 10-04-2010, 04:47 PM
wermbang wermbang is offline
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Check to see if you have a plenum leak. Look down the throttle body to see if there is oikl just sitting there.

In my truck I shoot for anything over 11 mpgs.
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Old 10-04-2010, 04:53 PM
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If it is leaking how would I go about fixing it? Is that just a gasket that can be replaced?
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Old 10-04-2010, 10:24 PM
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Quote:
Originally Posted by Redlongbed View Post
If it is leaking how would I go about fixing it? Is that just a gasket that can be replaced?
Yes...however many owners replace the botton steel plate as well with a thick aluminum one that doesn't warp like the steel one does. You can buy these kits from places like KRC and Hughes engines, among others.

There is also a test you can do to determine if your plenum is bad. Having some oil, especially on a higher mileage motor isn't unusual. It's blowby sucked through the PCV valve. If you have a vacum guage and a couple of hose plugs here's how to do it:

http://dodgeram.info/tsb/2000/09-05-00.htm

I don't know if you flashed your BCM for the larger tires, and if you didn't, your speedo and odometer are about 15% off. Since your mileage traveled is off, your fuel consumption is inaccurate. I get about 10-11 mpg with my ram with a 33 inch tire and 3:55 gears and I know my speedo is off about 8-9 mph. Those heavier tires take more fuel to push, and you lost a bit of aerodynamics lifting the truck.
Perhaps since your truck had set a while, I'd suggest checking tire pressure, running some fuel injector cleaner through the system to clean any varnish out, then perhaps cleaning your intake element. When is the last time you did a tune up?
Remember that OBDll systems ten to run richer in the cooler weather when the air temp cools.

Last edited by Okiespaniels; 10-04-2010 at 10:41 PM.
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Old 10-05-2010, 04:14 PM
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Got a pretty good boost on mine after I cleaned the throttle body. If it's the plenum, you should be using alot of oil.
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Old 10-05-2010, 09:24 PM
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I actually just ran into the same problem with my 97, I had found on here how to adjust your throttle position sensor, I did that and it seemed to help. Another thing to check is vacuum lines at the throttle body, I also found one of them dry-rotten right on the front of the throttle body. Do you have a factory muffler on? I dropped mine and put on a glasspack and noticed a difference. I was runnin 10mpg before and with adj. the sensor, fixing the vacuum line, a new muffler, and a new stock air filter i brought it back up to 13. I have new plugs to drop in and I plan on getting a high performance coil, HD rotor and cap, and some 8.5mm plug wire, and eventually a CAI. BTW have fun at Rausch its all but in my back yard
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Old 10-05-2010, 09:49 PM
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If you do a tune up it helps out with the MPGs. I got a induction service done at the dealer and it helped out with performance and also MPGs. You can also change the spark plugs and wires to get the fuel burning better. That kinda stuff doesnt cost too much and you will get some better response from your truck.

If you also switch over to synthetic oil you can maybe get some MPGs back. As long as you clean the motors components, especially the induction system, you can get some back.
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Old 10-07-2010, 12:58 PM
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I do not have an aftermarket exhaust on the truck yet, however I do run synthetic oil and I replaced the plugs, wires and coil at around 50,000 miles and I am only at about 65,000 right now. I'm going to take a look at the throttle body sometime this week and I'll let you guys know how it goes. How would I flash the BCM for the larger tires?
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Old 10-07-2010, 05:18 PM
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Quote:
Originally Posted by Redlongbed View Post
I do not have an aftermarket exhaust on the truck yet, however I do run synthetic oil and I replaced the plugs, wires and coil at around 50,000 miles and I am only at about 65,000 right now. I'm going to take a look at the throttle body sometime this week and I'll let you guys know how it goes. How would I flash the BCM for the larger tires?
The cheapest way is to have a dealer do it...probably about 75 bucks. Other and more expensive options would be a a Superlift(?) product that allows you to switch between two different sized tires. This is installed in the wiring harness. Or either a Superchips tirepak if they still make them, or any brand of tuner that allow you to adjust tire size.
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Old 01-27-2011, 03:05 AM
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i think im having this problem.. i bought my truck last weekend and i dont think my mph gauge is accurate to the truck i have.. what do you do to have the truck "tuned" up to the so the BCM? is accurate??

Also what is the BCM is that like the engines computer? Do I just take my truck to a dealer for a tuneup and tell them i need to get my wheels sync'd to the mph gauge or what?
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