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excessive fuel consumption

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Old 11-29-2010, 08:57 PM
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Default excessive fuel consumption
i need some help guys my jeep is going threw gas like crazy
could yall give me some reasons why it would be doing this
thanks
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Old 11-29-2010, 09:04 PM
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have you checked all vacuum lines , maybe os
2 sensor gone bad
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Old 11-29-2010, 09:07 PM
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Is it lifted with big tires?
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Old 11-29-2010, 09:09 PM
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Originally Posted by freegdr
have you checked all vacuum lines , maybe os
2 sensor gone bad
well i have one line im going to replace this weekend
and i just replaced both of my o2 sensors
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Old 11-29-2010, 09:09 PM
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Originally Posted by OOdynamite
Is it lifted with big tires?
no it just has a 3 inch lift
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Old 11-29-2010, 09:14 PM
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broken vacuum line introduce more air into the mixture the ecm will add more fuel to compensate
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Old 11-29-2010, 09:14 PM
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ok cuz bigger tires can lower your MPGs
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Old 11-29-2010, 09:15 PM
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O2 sensor, Vacuum leak, Thottle Position Sensor?

Great explanation on sensors below:

http://www.lunghd.com/Tech_Articles/...iagnostics.htm
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Old 11-29-2010, 09:17 PM
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Originally Posted by jimbo98xj
no it just has a 3 inch lift
3 inches of lift is enough to change what little aerodynamics our vehicles have. The larger tires you can fit under it change the amount of fuel you use to. Check your o2 sensors, plugs, wires, air filter.
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Old 11-29-2010, 09:22 PM
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Originally Posted by freegdr
broken vacuum line introduce more air into the mixture the ecm will add more fuel to compensate
alryte i broke the plastice tube running from the top back part of the engine that runs to the manifold i think your saying that could be the problem
by the way i have a 98 xj
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Old 11-29-2010, 09:25 PM
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Originally Posted by 00jeepXJ
3 inches of lift is enough to change what little aerodynamics our vehicles have. The larger tires you can fit under it change the amount of fuel you use to. Check your o2 sensors, plugs, wires, air filter.
alryte i have changed the spark plugs the wires the 02 sensors and the air filter and the throttle position sensor
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Old 11-29-2010, 09:27 PM
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Originally Posted by jimbo98xj
alryte i broke the plastice tube running from the top back part of the engine that runs to the manifold i think your saying that could be the problem
by the way i have a 98 xj
is there suction present when motors running
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Old 11-29-2010, 09:31 PM
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Originally Posted by freegdr
is there suction present when motors running
yes there is
i bought a rubber tube and slipped the plastic tube inside the rubber one on both sides
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Old 11-29-2010, 09:33 PM
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not if you fixed it so it not leaking vacuum any more see if theres ant trouble codes
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Old 11-29-2010, 09:37 PM
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i guess ive got to go to autozone tomorrow and get that check engine light checked
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