tips for better mpg
Member
Joined: Jan 2013
Posts: 193
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From: long island NY
Year: 1998
Model: Cherokee
Engine: 4.0
Herp Derp Jerp

Joined: Nov 2011
Posts: 18,251
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From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
CF Veteran
Joined: Feb 2012
Posts: 1,206
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From: Southern Oregon
Year: 1990
Model: Cherokee
Engine: 4.0
Soooo..... anything?
CF Veteran
Joined: Oct 2012
Posts: 1,277
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From: Orlando/Winter Garden
Year: 1998
Model: Cherokee
Engine: I6
Yea man, well, atleast the ones forsale. I got mopar cap, rotor & wires but if I were to buy new ones, odds are it'll be accel...unless anyone got a recommendation on another brand that would be better??
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
It's not pressure, it's vacuum. The higher you keep the manifold vacuum, by using the skinny pedal sparingly, the better the fuel economy.
Read this about all the diagnostics you can do with a vacuum gauge. A testing type gauge can be purchased for less than $20.
http://www.classictruckshop.com/club...ts/vac/uum.htm
Senior Member
Joined: Jan 2011
Posts: 730
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From: Joliet, Il
Year: 1996
Model: Cherokee
Engine: HO4.0 I6
I recently had exhaust work done at the dealership and pretty confident they put in a new downstream 02 sensor in the new cat I received. My question is, is it important to have matching 02 sensors? Both the same Brand? Or can I just buy any Upstream one I want (I know to still buy a quality piece).
Member
Joined: Jan 2013
Posts: 193
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From: long island NY
Year: 1998
Model: Cherokee
Engine: 4.0
I recently had exhaust work done at the dealership and pretty confident they put in a new downstream 02 sensor in the new cat I received. My question is, is it important to have matching 02 sensors? Both the same Brand? Or can I just buy any Upstream one I want (I know to still buy a quality piece).
Another fairly cheap gain is the injector swap. After I switched to the 703's I gained almost 2 mpg. Not bad for a $65 mod. Its one of those things where everyone gets different numbers though.
CF Veteran
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From: Bergen County, New Jersey U.S.A.
Year: 1990 Laredo
Model: Cherokee
Engine: 4.0 Inline 6 Renix
CF Veteran
Joined: Feb 2012
Posts: 1,206
Likes: 2
From: Southern Oregon
Year: 1990
Model: Cherokee
Engine: 4.0
So I was looking at this thread for more mpg tips
https://www.cherokeeforum.com/f51/bu...location-2599/
And it made me think after you relocate the IAT sensor you have a hole that needs to be plugged right? But I was thinking this would be a good spot to hook up that vacuum gauge cruiser was talking about earlier, there wouldn't be a problem with the vac gauge being hooked up there would there?
https://www.cherokeeforum.com/f51/bu...location-2599/
And it made me think after you relocate the IAT sensor you have a hole that needs to be plugged right? But I was thinking this would be a good spot to hook up that vacuum gauge cruiser was talking about earlier, there wouldn't be a problem with the vac gauge being hooked up there would there?
Last edited by PNWjeeper; Feb 2, 2013 at 12:20 AM.


