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excessive fuel consumption

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Old Nov 29, 2010 | 08:57 PM
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jimbo98xj
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From: slidell, LA
Year: 1998
Model: Cherokee
Engine: 4.0L inline 6 cylinder
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 Nov 29, 2010 | 09:04 PM
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From: Broward County Fl.
Year: 1989 xj sport 2dr
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have you checked all vacuum lines , maybe os
2 sensor gone bad
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Old Nov 29, 2010 | 09:07 PM
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From: York PA/State College PA
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Is it lifted with big tires?
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Old Nov 29, 2010 | 09:09 PM
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From: slidell, LA
Year: 1998
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Engine: 4.0L inline 6 cylinder
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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 Nov 29, 2010 | 09:09 PM
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From: slidell, LA
Year: 1998
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Engine: 4.0L inline 6 cylinder
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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 Nov 29, 2010 | 09:14 PM
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Year: 1989 xj sport 2dr
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Engine: 12 hole bosch Injectors
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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 Nov 29, 2010 | 09:14 PM
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ok cuz bigger tires can lower your MPGs
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Old Nov 29, 2010 | 09:15 PM
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From: Whittier, Ca
Year: 1989
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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 Nov 29, 2010 | 09:17 PM
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From: Kalamazoo, MI
Year: 2000
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Engine: 4.0L with throttle body spacer and cold air intake, bored throttle body, #784 injector upgrade
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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 Nov 29, 2010 | 09:22 PM
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From: slidell, LA
Year: 1998
Model: Cherokee
Engine: 4.0L inline 6 cylinder
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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 Nov 29, 2010 | 09:25 PM
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From: slidell, LA
Year: 1998
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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 Nov 29, 2010 | 09:27 PM
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From: Broward County Fl.
Year: 1989 xj sport 2dr
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Engine: 12 hole bosch Injectors
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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 Nov 29, 2010 | 09:31 PM
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From: slidell, LA
Year: 1998
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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 Nov 29, 2010 | 09:33 PM
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From: Broward County Fl.
Year: 1989 xj sport 2dr
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Engine: 12 hole bosch Injectors
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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 Nov 29, 2010 | 09:37 PM
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From: slidell, LA
Year: 1998
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Engine: 4.0L inline 6 cylinder
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i guess ive got to go to autozone tomorrow and get that check engine light checked
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