Secret vacuum line to save mpg
CF Veteran
Joined: Apr 2010
Posts: 2,209
Likes: 3
From: st.george utah
Year: 1996
Model: Cherokee
Engine: l6 4.0
A new guy writes in with questions that, to him, are real. Not only do the kids on the block here make sure he will never ask another question here, BUT they also offer some sage advise that will destroy his Jeep if he pays attention to these *****! Nice "brotherly" site! Good job kids.



Junior Member
Joined: Jul 2009
Posts: 96
Likes: 0
From: Quantico, VA and West Chester, PA soon to be Pensacola, FL
Year: 1998
Model: Cherokee
Engine: 4.0 L 6 Cyl.
You guys a jerks...don't tell him to do things like pour salt water in the engine...someone's gonna actually do it. You're supposed to use grape soda...the bubbles clean up all the engine sludge increasing fuel economy.
CF Veteran
Joined: Oct 2011
Posts: 4,440
Likes: 3
From: Seal Beach, CA
Year: 1996
Model: Cherokee
Engine: 4.0 HO Straight Six
Originally Posted by Tjheems
You guys a jerks...don't tell him to do things like pour salt water in the engine...someone's gonna actually do it. You're supposed to use grape soda...the bubbles clean up all the engine sludge increasing fuel economy.
Seasoned Member
Joined: Feb 2010
Posts: 254
Likes: 0
From: Tuscaloosa Alabama ROLL TIDE ROLL
Year: 1989
Model: Cherokee
Engine: 4.0
It's all about the black football in the bumper or the black soft ball under the hood. Need to smash that thing with a hammer a few good times. Don't do to much damage just enough for the let the air in.
Then mount it on the roof just drip holes in the fire wall and run the lines into the cab and then more holes in to the roof. Be sure the holes are 3-4 inches wide
Then mount it on the roof just drip holes in the fire wall and run the lines into the cab and then more holes in to the roof. Be sure the holes are 3-4 inches wide
Seasoned Member
Joined: May 2011
Posts: 268
Likes: 0
From: Waterford, PA
Year: 1999
Model: Cherokee
Engine: 4.0L
Originally Posted by Old Thom
A new guy writes in with questions that, to him, are real. Not only do the kids on the block here make sure he will never ask another question here, BUT they also offer some sage advise that will destroy his Jeep if he pays attention to these *****! Nice "brotherly" site! Good job kids.

CF Veteran
Joined: Oct 2009
Posts: 2,867
Likes: 16
From: Fauquier County, Virginia
Year: 1991
Model: Cherokee
Engine: I-6 4.0 HO
A new guy writes in with questions that, to him, are real. Not only do the kids on the block here make sure he will never ask another question here, BUT they also offer some sage advise that will destroy his Jeep if he pays attention to these *****! Nice "brotherly" site! Good job kids.


By the way the OP was talking a few posts back, he knows all this soda in the engine, salt in the intake, flux capaciter up-da-butt stuff is a joke. It's called "F-U-N".
Seasoned Member
Joined: Oct 2010
Posts: 486
Likes: 2
From: Colorado Rocky Mountains
Year: 1999
Model: Cherokee
Engine: 4.0 I6
My rocker panels gave me an idea the other day. It got me up to around 35mpg in 4WD. I don't even bother to take it out of 4WD any more I get such good mileage. The trick is to take a good look at your jeep, decide which parts are essential and which parts you like, then take a hack saw and cut the rest off. If you use power tools it won't work. Learned that the hard way.
Be careful, whatever you do don't break any glass. That stuff can cut you.

Be careful, whatever you do don't break any glass. That stuff can cut you.
Last edited by Potatowalker; Nov 28, 2011 at 10:16 AM. Reason: safety
Registered Users
Joined: Aug 2009
Posts: 791
Likes: 0
From: Ny
Year: 1995
Model: Cherokee
Engine: 4.0ho
take sand, any kind of sand, and suck it slowly into the intake tube (take it off after the filter)
have someoen in the jeep holding the revs around 2500 - 3000 and put about 10 handfuls of sand thru the intake, this will port and polish your head, aswell as polish off any build up in the combustion chamber.
have someoen in the jeep holding the revs around 2500 - 3000 and put about 10 handfuls of sand thru the intake, this will port and polish your head, aswell as polish off any build up in the combustion chamber.
Registered Users
Joined: Aug 2009
Posts: 791
Likes: 0
From: Ny
Year: 1995
Model: Cherokee
Engine: 4.0ho
stickers add 10 hp each if you eat them while adding fuel to your ride, and you make sure atleast 4 people can see you.
CF Veteran
Joined: Jan 2009
Posts: 1,964
Likes: 6
From: Baltimore, Maryland
Year: 1994 1993
Model: Cherokee
Engine: 4.0
Hello and welcome to the forum. Now that we have all had some fun with the "vacuum line" secrets I will jump in with a more serious reply and say..Perhaps your cousin misunderstood and this person he was talking to was referring to using some sort of hydrogen generator which can possibly increase your gas milage that much. Havent heard of anyone putting one in an XJ but know some people who have used this technology in other vehicles with success. Though not in cold weather.
Senior Member
Joined: Mar 2011
Posts: 522
Likes: 0
From: Las Vegas
Year: 1992
Model: Cherokee
Engine: 4.oL H.O. 784 injectors, EV6 to EV1 connectors, APN header, Dynomax exhaust
Originally Posted by 94XjSport94
As far as soda goes, is it Pepsi or Coke products? I can never remember
Just find your friend with a YZ250 mx bike and get the purple powerband off it.
Add it to your XJ and its like adding a SuperCharger, +200 HP, and it actually brings the
MPG up to around 34 mpg.
You know its true.
Just be careful with the extra power.....
This poor fellow tried it and you see what happened to him.

Add it to your XJ and its like adding a SuperCharger, +200 HP, and it actually brings the
MPG up to around 34 mpg.
You know its true.
Just be careful with the extra power.....
This poor fellow tried it and you see what happened to him.



