I NEED MPG!!!!!!!!
Seasoned Member
Joined: Jun 2010
Posts: 448
Likes: 0
From: Charleston, SC
Year: 1990 - 2000
Model: Cherokee
Engine: 4.0
If you have noticed any recent loss in mileage and it has been a while (50k+ miles) since your last O2 sensor, you may want to replace as well. Mine went bad and cost me ~2 MPG for a while before I caught it.
Newbie
Joined: Nov 2010
Posts: 14
Likes: 0
From: Gloucester, ENGLAND
Year: 1993
Model: Cherokee
Engine: 4.0L
think about changing your tps...as preventative maintenence, i just replaced mine....HUGE difference!!!! also check your throttle body studs...mine were not tight, torqued them to spec and topped off the tank with mid-grade gas....so far, this fill-up, i've managed to drive 83 miles on a little over 1/8th of a tank!!!! it's blowing my mind!!! 4.0 with auto trans on 30x9.5 tires.
As a newbie to Jeeps I love reading all the posts but wtf is 'tps' anyway
Newbie
Joined: Apr 2010
Posts: 11
Likes: 0
From: charlotte nc
Year: 1996
Model: Cherokee
Engine: 4.0
dodge neon 703 fuel injectors for like $40ish in a junk yard. should gain at least 1mpg
CF Veteran
Joined: Oct 2009
Posts: 2,867
Likes: 16
From: Fauquier County, Virginia
Year: 1991
Model: Cherokee
Engine: I-6 4.0 HO
I gained 2-3 with mine. Also, swap your mechanical fan with a an electric one. Get a 16" fan with some serious cfm (at least 2500 if you're towing) and build it into your mech shroud. Then just wire it up with a thermo-switch. Maybe buy one of those deflectors that mounts on the front of the Jeep to give it a curved look. I dunno man, if you're running stock you get about 20 mpg highway without towing. Don't expect to get like 30 mpg, but be glad the Jeep will most likely get you there and back with no issues.
Senior Member
Joined: May 2010
Posts: 889
Likes: 2
From: Detroit, MI
Year: 1994
Model: Cherokee
Engine: 4.0
Seriously,
you can rent a car for $30 a day, I would bet you could pay for it in the gas you save and you have the peace of mind if it fs'up its their baby.
I started renting cars for trips after the S15 Jimmy blew a tranny 500 miles from home. The money I spent going after it would have paid for the rental car 3x over.
Do a tune up and make sure the timing is set as advanced as you can get without it pinging or being hard to start too.
you can rent a car for $30 a day, I would bet you could pay for it in the gas you save and you have the peace of mind if it fs'up its their baby.
I started renting cars for trips after the S15 Jimmy blew a tranny 500 miles from home. The money I spent going after it would have paid for the rental car 3x over.
Do a tune up and make sure the timing is set as advanced as you can get without it pinging or being hard to start too.
I agree...but the OP has to tow a trailer and rental cars don't have that setup...at least not in the $30 a day variety.
Senior Member
Joined: May 2010
Posts: 889
Likes: 2
From: Detroit, MI
Year: 1994
Model: Cherokee
Engine: 4.0
BTW, if you keep the RPMs below 2000, you'll be surprized at the mileage you get. I can pull 19 with mine in mixed driving. I'll bet it gets 22 or so on the E-way. That ain't bad.
Don't know why, but that seems to be the magic number.
Don't know why, but that seems to be the magic number.
Newbie
Joined: Jun 2010
Posts: 18
Likes: 0
From: CA
Model: Cherokee
Engine: 4.0
Remove the four bug catchers on the roof (plus roof rack and/or cross bars), air up the tires to 35 PSI, (swap to skinny tires if you have them), tape the body seams, drive like your grandmother used to (or still does).
Higher octane fuel has fewer BTUs per gallon. If you run higher compression, or more advanced timing, you will get better mileage and need the extra octane to reduce/eliminate pre-ignition and detonation (both bad). If you notice any pinging climbing the mountains, bump up a grade to prevent it. Otherwise, stick with regular.
Have a safe trip.
Higher octane fuel has fewer BTUs per gallon. If you run higher compression, or more advanced timing, you will get better mileage and need the extra octane to reduce/eliminate pre-ignition and detonation (both bad). If you notice any pinging climbing the mountains, bump up a grade to prevent it. Otherwise, stick with regular.
Have a safe trip.
Member
Joined: May 2010
Posts: 151
Likes: 0
From: bullville,ny
Year: 1998
Model: Cherokee
Engine: 4.0
well i dindnt have time to read all the posts so sorry if im repeating what somone already said.I would change the ignition system run the e3 spark plugs and like 8mm wires and im shore somone sells a hoter coil.Hoter spark means better fuel burn
CF Veteran
Joined: Oct 2008
Posts: 2,127
Likes: 2
From: Hell, CA
Year: 1989
Model: Cherokee
Engine: 4.0L I6
You should come and play at the dunes on your way!
Less skinny pedal helps, for sure. The accell super-tune kit is decently priced online. Comes with 8.8mm wires, cap/rotor and plugs.
Ford/other 4 hole injectors.
Upgraded TB from strokedjeep.com
Less skinny pedal helps, for sure. The accell super-tune kit is decently priced online. Comes with 8.8mm wires, cap/rotor and plugs.
Ford/other 4 hole injectors.
Upgraded TB from strokedjeep.com
CF Veteran
Joined: Jan 2009
Posts: 1,964
Likes: 6
From: Baltimore, Maryland
Year: 1994 1993
Model: Cherokee
Engine: 4.0
