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XJ Ask the Question Thread
CF Veteran
Joined: Aug 2010
Posts: 8,357
Likes: 103
From: Canton, MI
Year: 1999
Model: Cherokee
Engine: 4.0
Ethanol in the US is a joke for a couple of reasons. Actually it's nearly criminal. Ethanol has a lower energy density than gasoline, so it's no surprise that most vehicles have worse fuel economy running on E10 blends. Certain engines, have actually been known to have economy worsened to the point that the overall rate that gasoline is burnt has actually increased! Go figure huh. The great "environmental" irony is that ethanol burns cleaner than gasoline - this is true - however in the US (and Canada, by extension) ethanol is derived from corn. As you've probably noticed after eating corn on the cob, corn is incredibly tough. To process the sugars into ethanol and break down the fibrous matter, the corn is made into a slurry and cooked in coal-fueled furnaces. So not only are engines using more gasoline, but we're also firing massive coal plants! Yeah that sounds green to me! In addition to this, the whole nightmare is actually driving up world food prices because we're using food for fuel... and world fuel prices because we're using more fuel because the food doesn't burn well enough! (Technically the corn used in ethanol isn't "food grade", but tell that to cows. As well the amount of arable land is very limited and this is a colossal waste of natural resources, and stuff like fertilizer) Literally the only parties that benefits from ethanol are corn farmers, who receive a nice government subsidy to waste gas instead of feeding people.
Brazil, on the other hand, is doing it right and using sugar cane, which is easier to process and much more efficient in terms of resource use to produce a certain amount of sugar (way sweeter than corn...). The US and Canada would be doing the same thing if not for some political bull****. In vehicles that can run it, sugar cane-derived E85 is much cheaper and has an overall lower environmental impact than running pure gasoline or E10.
Brazil, on the other hand, is doing it right and using sugar cane, which is easier to process and much more efficient in terms of resource use to produce a certain amount of sugar (way sweeter than corn...). The US and Canada would be doing the same thing if not for some political bull****. In vehicles that can run it, sugar cane-derived E85 is much cheaper and has an overall lower environmental impact than running pure gasoline or E10.
Herp Derp Jerp
Joined: Nov 2011
Posts: 18,251
Likes: 17
From: Parham, ON
Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
::CF Moderator::
Joined: Aug 2011
Posts: 43,971
Likes: 1,578
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
AFPR? I know what it stands for, but why not a fixed 80 or 100 or something?
I'm not in the know, I just want to bump up the regulator pressure on my '88 XJ by 10-20 psi, I know to keep an eye on the lines and connections for bulging, leaks and other signs of possible failure, I will be using a wideband to tune for my cam and manifold swap anyway, but I am somewhat new on extensive mods, I don't know if fuel pump constant pressure ratings are typically much higher than their regulated pressures, or what the deal is, is would seem like the higher you could run the better off you'd be, better atomization, higher flow.... And if that's the case my extrapolation begs the question; Why don't manufacturer's run higher pressures?
I'm not in the know, I just want to bump up the regulator pressure on my '88 XJ by 10-20 psi, I know to keep an eye on the lines and connections for bulging, leaks and other signs of possible failure, I will be using a wideband to tune for my cam and manifold swap anyway, but I am somewhat new on extensive mods, I don't know if fuel pump constant pressure ratings are typically much higher than their regulated pressures, or what the deal is, is would seem like the higher you could run the better off you'd be, better atomization, higher flow.... And if that's the case my extrapolation begs the question; Why don't manufacturer's run higher pressures?
aka Auxiliary Fuel Pressure Regulator when used in the return line after the stock FPR.
Junior Member
Joined: Jun 2010
Posts: 60
Likes: 0
From: Grenada, West Indies
Year: 1987
Model: Wagoneer
Engine: 4.0L FI 6cyl [still king of the hill ]
Member
Joined: Dec 2013
Posts: 176
Likes: 0
From: VA, USA
Year: 2001
Model: Cherokee
Engine: 4.0 L, Inline Six
Hi!
So I've seen these front sun shade for the XJ. They almost extend the roof, and go right over the windshield anybody know what their called?
Thanks Yall!
So I've seen these front sun shade for the XJ. They almost extend the roof, and go right over the windshield anybody know what their called?
Thanks Yall!
CF Veteran
Joined: Oct 2012
Posts: 2,314
Likes: 3
From: Canton, GA
Year: 1996
Model: Cherokee
Engine: 4.0
Junior Member
Joined: May 2008
Posts: 15,016
Likes: 11
From: +34° 25' 35.67", -81° 21' 12.04"
Year: 1993
Engine: 4.0
Seasoned Member
Joined: Dec 2013
Posts: 473
Likes: 0
From: SATX
Year: 1999
Model: Cherokee
Engine: 4.0 I6
weird goings on with my temp gauge
my temp gauge acts funny. when the engine is at operating temp the gauge will sometimes read really low like startup temp and then later on in my drive it will go up to the 190 range and then it goes back to cold range and back again intermittently. never reads too hot and jeep runs fine. mechanically haven't had issues but I'm wondering if its a sensor and which one? or if its the sending unit (wire connection). anybody have thoughts?
