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05-04-2012, 06:45 PM
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#31
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AFSOC Retired
Join Date: Aug 2005
Location: Colorado
Posts: 11,737
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Quote:
Originally Posted by jlaudio_jeep
Well if you install a short ram intake and a free flowing exhaust you should get an extra MPG or 2 at the most but its louder and a lot of money that could have been spent on gas.
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Quote:
Originally Posted by Knuckelhead
I don't think so... IMO
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Quote:
Originally Posted by jlaudio_jeep
You saying more or less?
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Less...
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05-04-2012, 06:48 PM
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#32
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Registered User
Join Date: Jul 2010
Location: Winston-Salem
Posts: 126
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Quote:
Originally Posted by SlackJaw
in all seriousness, I'd like to hear back how that helps.
The TJ is utilitarian, it do what it do. It don't care how aerodynamic you try to make it.
Personally, I think proper maintenance is the best you can do....you are already on course with o2 and plugs...will be interested to hear back after the o2 change if you find cat codes. I have those, just haven't got round to replacing them. I don't have high hopes that my mpg are going to improve 
Other than that, all the things the jeep is whispering in your ear for you to do to her, chip away at that mpg. |
Proper maintenance is what I'm leaning on. After replacing the o2 sensor and plugs I'm going to take a look at the cat.
__________________
2004 Jeep Wrangler Rubicon, 4" Rough Country N2 lift, 35" Mickey Thompson MTZ, off-brand winch and bumpers (replacing soon)
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05-04-2012, 06:52 PM
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#33
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Registered User
Join Date: Mar 2006
Location: Dallas, TX
Posts: 6,181
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Try a different gas from a different location. I noticed that if I use a gas that has Ethanol added I don't get as good MPG.
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05-04-2012, 07:13 PM
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#34
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Registered User
Join Date: Jun 2009
Location: Bloomington, Illinois
Posts: 248
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Quote:
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Originally Posted by Knuckelhead
Less...
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I don't know on a jeep but I got an improvement of 4 MPG on my car when I did a short ram and exhaust.
It's hard to get better MPG when you drive a brick wall.
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05-04-2012, 07:14 PM
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#35
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Registered User
Join Date: Jan 2011
Location: Baltimore, Maryland
Posts: 2,420
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So if I don't have a check engine light, I could still get a code on a code reader? We've got one, apparently a good one, but I haven't used it yet. I guess I just thought that if there were a code you would automatically get a check engine light. Not true?
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[SIZE="4"]KevKaos[/SIZE]
[SIZE="4"]Honey Badger Wheelin'[/SIZE]
[FONT="Arial Black"][SIZE="5"][COLOR="Red"]RED JEEP CLUB # 621[/COLOR][/SIZE][/FONT]
It's not much, but check out my build thread;
[url]http://www.jeepforum.com/forum/f22/kevkaoss-05-red-rubicon-build-thread-1170741/[/url]
[QUOTE=krashnpa;12397572] I know kev was riding his tank skid and belly pretty good on some of the blacks up at RC, but he doesn't back down from the line either.[/QUOTE]
[QUOTE=squazz;13612008]so I use my original nuts?[/QUOTE]
You should, in no way, take any of this personally. It's just business. So to recap, I come in peace, I mean you no harm, and you all will die. Gallaxhar out.
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05-04-2012, 07:15 PM
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#36
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Registered User
Join Date: Mar 2006
Location: Dallas, TX
Posts: 6,181
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Quote:
Originally Posted by jlaudio_jeep
I don't know on a jeep but I got an improvement of 4 MPG on my car when I did a short ram and exhaust.
It's hard to get better MPG when you drive a brick wall.
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That has a tractor engine. 
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05-04-2012, 07:33 PM
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#37
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Read tech links in my sig
Join Date: Dec 2005
Location: Colorado
Posts: 21,685
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Quote:
Originally Posted by KevKaos
So if I don't have a check engine light, I could still get a code on a code reader? We've got one, apparently a good one, but I haven't used it yet. I guess I just thought that if there were a code you would automatically get a check engine light. Not true?
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a bad cat or sluggish O2 sensor or bad cat doesn't necessarily have to throw a code. the idea is that something will, but notice the 3rd cat on the 00+'s isn't monitored. regarding the O2 sensors, the PCM is checking for the difference of O2 and temperature between the upstream and downstream sensors. The PCM will trim the A/F ratio a little bit to heat up, or cool down, the cats as needed to maintain optimal emissions. If one of them or both sensors goes bad slowly, it may be possible the voltage is still within spec, so no code is thrown, but the PCM thinks the cats aren't running optimally...so it dumps extra fuel into the engine constantly to heat the cats up...and bingo bad gas mileage and eventually 3 melted cat internals. ...or at least something like that could be the case based on what i keep reading between experiences here and what the FSM says. i don't believe the downstream O2s have no effect on A/F ratio like some claim...the FSM, and a PCM tuner (jgorm here), suggest downstream O2 sensors will trim fuel around stoich as necessary to keep the cats at optimal operating temp....thats how they monitor the "health" of the cat.
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05-04-2012, 08:37 PM
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#38
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Web Wheeler
Join Date: Sep 2011
Location: Tulsa, OK
Posts: 3,157
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And that is what pisses me off about the whole system and/or dx'ing it.
I have no way of certainty that a 432/420 means my cats are bad....or my o2 are bad...could just be running rich for some entire other reason? 
Anyway...gonna check all the other reasons before pulling the entire exhaust.
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05-04-2012, 08:49 PM
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#39
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Registered User
Join Date: Dec 2011
Posts: 35
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I have an 06 rubicon lj with a six speed. I checked my mpg every tank on a 2000 mile round trip from Seattle to Death Valley. The best I ever got was 18 on the freeway and the worst was 12 on the trail. I was loaded down with gear but stock otherwise.
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2006 White LJ Rubicon - Stock
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05-04-2012, 08:59 PM
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#40
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Registered User
Join Date: Dec 2011
Posts: 609
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1st things first, OP ...
1. Check to see that the speedometer is calibrated properly. If not, my personal favorite is the SpeedoHealer. Takes 5 minutes to install and can be recalibrated for any size wheels/tires. If you ever change in the future, reprogramming it is a snap.
2. Once you know the speedo is correct, do the normal stuff you know the previous owner didn;t do because he/she knew they were about to sell the Jeep: Oil change. New plugs, plug wires, air cleaner, cap and rotor, and maybe even a new coil. (How many miles on it?) Also, you might want to change the tranny fluid, differential, and radiator fluids because the first owner probably did none of these and it's really pretty cheap if you do it all yourself.
3. Okay, now you've done all the fluids, tune up, etc. Check the mileage now. If it's still bad, like the guy said before, it's probably O2 sensors. Either get an electronic gizmo to read the error codes, or take it to someone who can.
My guess is that by the end of this list, you'll see a slight bit better mileage, but let's face it ... it's a Jeep. Anything over 10 is probably about right.
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F U
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05-04-2012, 09:04 PM
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#41
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Registered User
Join Date: Jun 2009
Location: Bloomington, Illinois
Posts: 248
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All you need is an eBay Bluetooth OBD scan tool and a smartphone. Download the torque app and you can check codes and clear them. You can also use your phone to view gauges your dash doesn't display. It's very cool and can be transferred to any OBD vehicle.
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05-04-2012, 09:10 PM
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#42
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Read tech links in my sig
Join Date: Dec 2005
Location: Colorado
Posts: 21,685
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Quote:
Originally Posted by jlaudio_jeep
All you need is an eBay Bluetooth OBD scan tool and a smartphone. Download the torque app and you can check codes and clear them. You can also use your phone to view gauges your dash doesn't display. It's very cool and can be transferred to any OBD vehicle.
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ever heard of a Scangauge?
http://www.scangauge.com/products/scangaugeii/
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05-04-2012, 09:13 PM
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#43
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AFSOC Retired
Join Date: Aug 2005
Location: Colorado
Posts: 11,737
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Quote:
Originally Posted by jlaudio_jeep
I don't know on a jeep but I got an improvement of 4 MPG on my car when I did a short ram and exhaust.
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And this isn't a car forum...
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05-04-2012, 09:14 PM
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#44
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Watching Big Brother?
Join Date: May 2009
Location: 34*24'N, 119*42'W, SoCal
Posts: 3,893
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Quote:
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Originally Posted by jlaudio_jeep
I don't know on a jeep but I got an improvement of 4 MPG on my car when I did a short ram and exhaust.
It's hard to get better MPG when you drive a brick wall.
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This is not your car, none of what you mentioned will help the op, and that includes the Bluetooth, smart phone, blah, blah, blah.
It's great that you're wanting to contribute, but until you spend more time erring to know the 4.0L, it's better to read more and post less. I mean that in the nicest possible way. 
__________________
Gear-Calculator Stu Can Help You Part Names and Numbers Dealer Supplied Parts and ask for "Jeep Club" Prices
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Originally Posted by Ron Paul
“Liberty is lost through complacency and a subservient mindset. When we accept or even welcome automobile checkpoints, random searches, mandatory identification cards, and paramilitary police in our streets, we have lost a vital part of our American heritage. America was born of protest, revolution, and mistrust of government. Subservient societies neither maintain nor deserve freedom for long.”
― Ron Paul
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"Did you exchange your walk-on part in the war for a lead role in a cage?"
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05-04-2012, 09:22 PM
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#45
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Web Wheeler
Join Date: Sep 2011
Location: Tulsa, OK
Posts: 3,157
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lol, all the aholse show up around 10 on Friday 
I think we pretty much covered all this.
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>
Horrible mpg in a new-to-me Jeep
