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  #1  
Old 02-21-2010, 11:49 AM
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Default Excessive fuel consumption HELP

I have a 05 Ram 1500 4x4 Quad cab 4.7 6sp manual. The truck is in great shape with only 40 k on it. Recently it started using alot more gas. I can literally watch the guage going down. I have gone from about 16 mpg around town down to about 12 mpg. I have changed the oil every 3 k since new. When it started using more gas I figured it was time for a tune up. I put in new plugs changed the oil in the front and rear end and transfer case. The mechanic said the oil in the transfer case was really dirty. Truck runs fine and doesn't seem to have less power. I'm wondering if maybe the front hubs haven't disengaged or something like that??
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Old 02-21-2010, 12:28 PM
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It's possible. Jack up the front end and see if the wheels turn independently.
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Old 02-21-2010, 02:12 PM
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Define "Recently"...winter blend fuels tend to reduce mileage.

Another contributor to the problem could be a leaky fuel injector. Have you cleaned your fuel system lately?
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Old 02-21-2010, 02:13 PM
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Let us know what you come up with . Does Canada have oxygenated fuel ? Here in the states we do and you can definitely notice a drop in fuel economy . Don't forget to stop by the newbie section and introduce yourself .
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Old 02-21-2010, 07:35 PM
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Jacked the front end up and turned the wheels. Wheels turn independantly. Driveshaft from front end to transfer case turns. Talked to mechanic and he says that that is normal. Its not an issue with winter fuel. I have had the truck for 5 years and the fuel consumption has been the same year round until now
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Old 02-21-2010, 08:37 PM
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Ur still getting better than my 5.7! Do you let it idle more due to the cold weather?
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Old 02-21-2010, 09:05 PM
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Well it sounds like you might have a leaking injector but if you did you would have a code popping up for one of the banks running rich or some kind of code. This may seem stupid but have you checked you air filter? Also another thing to think about might be your brakes. The rears might be hanging up causing a load on the truck. It could just be fuel also, I've seen my MPG go down a few in the winter.
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Old 02-21-2010, 11:21 PM
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No Idling. Just start it up and drive. Truck will coast no problem so I have now ruled out brake drag or similar issues. I have replaced the air filter regularily when I had it tuned up the mechanic said the air filter was fine. I guess I might have to have a dealer check it. I'm not getting any service engine light or anything like that. Maybe O2 senser or something like that.
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Old 02-21-2010, 11:30 PM
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Quote:
Originally Posted by Holaday View Post
No Idling. Just start it up and drive. Truck will coast no problem so I have now ruled out brake drag or similar issues. I have replaced the air filter regularily when I had it tuned up the mechanic said the air filter was fine. I guess I might have to have a dealer check it. I'm not getting any service engine light or anything like that. Maybe O2 senser or something like that.
o2 sensor is the place I'd go
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Old 03-01-2010, 04:31 PM
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Default Problem solved I think

When I spoke with the mechanic who did the tune up he suggested that this might be the problem. The computer on the engine [ ECU electronic control unit] had made adjustments to compensate for the out of tune engine. Once I had the tune up the ECU was still adding additional fuel to compensate for the out of tune motor. He suggested disconnecting the battery for more than 15 minutes to reset the ECU to factory settings. I did this and I'm happy to report that it appears that I'm back to getting decent mileage. I filled my tank and so far have driven around town and only used 1/8 of a tank to go 60 miles.
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