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powerram250 03-20-2013 09:28 PM

3 mpg
98 dodge ram 318 with a 5spd just bought it. 137000 miles. 305/70r17 on it x cab. Put 5 gallon it it and got 14.7 miles. Can't afford to drive it. Need help very badly

RamTech 03-21-2013 09:25 AM

The first thing I see is the oversize tires - this makes me think your odometer and speedometer aren't calculated correctly. What gears are in this truck? Is the MIL on and are there any codes? Are the O2 sensors old or have they ever been changed? How about maintainance, has it been tuned up in the last 30k miles? Are you running fuel with ethanol in it, or 100% gasoline?

powerram250 03-21-2013 03:04 PM

Codes 133 and 171.

powerram250 03-21-2013 03:05 PM

Going to do a full tune up tomorrow to see if it helps along with the upstream o2

RamTech 03-21-2013 03:08 PM

There you go. P0133 indicates a slow response from the 1/1 O2 sensor which is a primary sensor used for calculating the fuel curve. The P0171 indicates a lean condition which means the PCM will be trying to enrich the fuel mixture. Replace the upstream sensor, clear the codes and run a couple of tanks of fuel through it and track your MPG. You should see an improvement.

plumcrazy73 03-21-2013 09:49 PM

check and see if you have a gas leak

powerram250 03-21-2013 11:12 PM

Will do the upstream tomorrow and see hopefully it will improve a good bit. I have checked for gas leaks and have none. The k&n air filter is new. Oils been changed. So hopefully the o2 will fix most of the problem. Thanks

snrusnak 03-22-2013 09:06 AM

Seems likely it's the O2 sensor. If it's still not running great after the fix you could try plugs/wires/etc, cheap tune up parts.

I believe coolant damages O2 sensors, so if the you get the same code shortly after the fix, you may have a coolant leak in the engine. Just a thought, I'm not positive it that error would be caused by this.

namretsud 04-12-2013 11:59 PM

Could also have a bad plenum gasket leak.

friendlyHP 04-16-2013 11:21 PM

sounds about right for that vehicle at that many miles though. Just listen to everybody's advice and remember the best fuel saver is your foot.

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