Jeep Garage  - Jeep Forum

Jeep Garage - Jeep Forum (http://www.jeepgarage.org/forums.php)
-   Engine Performance/Intake/Exhaust (http://www.jeepgarage.org/f196/)
-   -   Horrible fuel economy on a 2000 jeep grand cherokee laredo 4.0 (http://www.jeepgarage.org/f196/horrible-fuel-economy-on-a-2000-jeep-grand-cherokee-laredo-4-0-a-6778.html)

violant00 02-21-2010 03:12 PM

Horrible fuel economy on a 2000 jeep grand cherokee laredo 4.0
 
Just bought a 2000 jeep about a month ago and i've noticed that i literally have been getting only 9 - 12 mpg highway. Any ideas on why this might be happening other then in need of a spark plugs replacement air filter change and oil change?

violant00 02-21-2010 03:17 PM

Really bad fuel economy 2000 jeep grand cherokee
 
Just bought a 2000 jeep about a month ago and i've noticed that i literally have been getting only 9 - 12 mpg highway. Any ideas on why this might be happening other then in need of a spark plugs replacement air filter change and oil change? :slapfight:

robpp 02-21-2010 03:39 PM

Re: Really bad fuel economy 2000 jeep grand cherokee
 
o2 sensors will cause a big decrease in fuel mileage. could be anything bro.

violant00 02-21-2010 03:43 PM

Re: Really bad fuel economy 2000 jeep grand cherokee
 
I figure I change everything then doesn't look like who ever else had the car didn't change the things they are supposed to change after certain miles.

robpp 02-21-2010 03:48 PM

Re: Really bad fuel economy 2000 jeep grand cherokee
 
im like that with a used vehicle as well. things like the plugs, wires, cap, rotors, clean the TB, drain and refill every fluid......

but dont overlook those o2 sensors.......

206WJ 02-21-2010 04:04 PM

Re: Really bad fuel economy 2000 jeep grand cherokee
 
I agree too. It seems like people just don't really care about cars. Do the fluids, Spark Plugs, and o2 sencors first, and see what happens. Also check your air pressure in the tires. That can make a big difference too.

violant00 02-21-2010 05:10 PM

Re: Really bad fuel economy 2000 jeep grand cherokee
 
i'll check out the o2s first if i don't see a difference i'll do everything else. The car got 120500 miles on it runs beautiful no shakes no noises the only thing is the darn mpgs that are killing me.

Scottina06 02-22-2010 12:04 AM

Re: Horrible fuel economy on a 2000 jeep grand cherokee laredo 4.0
 
is it the 4.7?

ItsAJeepThing 02-22-2010 12:17 AM

Re: Horrible fuel economy on a 2000 jeep grand cherokee laredo 4.0
 
reset ur mpg on the computer
i get 9mpg in the city and i have i6 4.0

Black Ops Auto Works 02-22-2010 08:26 AM

Re: Horrible fuel economy on a 2000 jeep grand cherokee laredo 4.0
 
Quote:

Originally Posted by violant00 (Post 155266)
in need of a spark plugs replacement air filter change and oil change?

I would it couldn't hurt!!!

grdaemon 02-22-2010 09:00 AM

Re: Really bad fuel economy 2000 jeep grand cherokee
 
Is changeing the O2s a PITA?

FlyinRyan 02-22-2010 09:00 AM

Re: Horrible fuel economy on a 2000 jeep grand cherokee laredo 4.0
 
What mileage?

check tire pressure, change oil and plugs, inspect air filter.

if all of those check out OK then it is likely a plugged catalytic converter or a bad O2 sensor.


All times are GMT -5. The time now is 03:29 AM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community