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Old 03-12-2011, 02:22 PM   #1
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Power problem

This weekend we just drovedown to gulfport, 12 hour drive, we had a serious problem with gas mileage and just staying up to speed.

I have had my 33's and lift for awhile (3 1/4)

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Old 03-12-2011, 05:25 PM   #2
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Whoot!

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Old 03-12-2011, 06:02 PM   #3
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I didn't want to enter, because my '08 JKU Rubi cruises at 70 in O/D, (2000 rpm) on level freeways and when it gets hilly, I drop out of O/D and cruise at 60/70 3000 rpm-

My tires are Hankook 33.2" MTs at 30 psi for freeway travel and I have no trouble with power-

It's definately not a racer, but it's comfy on long trips-

No engine changes and 4.10 gears and dual Flowmaster 40 cat-back exhaust !!

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Old 03-12-2011, 06:09 PM   #4
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Are you saying something has changed? Did you have this problem before too, or have you driven this same stretch with no problems previously?
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Old 03-12-2011, 08:36 PM   #5
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I'll echo what Jimbo said.

I have an 07 door, Superchipped on 35's with 4.10 gearing. Flat highway I cruise at 1900rpm@70 in OD. Long hills it downshifts to 3rd, depending how hard I'm on it. My gas mileage is approx 16-17mpg if I keep my Jeep onroad...possibly better for long road trips.

No issues with power or low end at all. I can smoke these 35's if I want
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Old 03-12-2011, 11:12 PM   #6
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Quote:
Originally Posted by MTH
Are you saying something has changed? Did you have this problem before too, or have you driven this same stretch with no problems previously?
Something has changed, commonly its easy going and i average 18-20 mpg's this time i averaged 12
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Old 03-12-2011, 11:14 PM   #7
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Quote:
Originally Posted by JIMBOX
I didn't want to enter, because my '08 JKU Rubi cruises at 70 in O/D, (2000 rpm) on level freeways and when it gets hilly, I drop out of O/D and cruise at 60/70 3000 rpm-

My tires are Hankook 33.2" MTs at 30 psi for freeway travel and I have no trouble with power-

It's definately not a racer, but it's comfy on long trips-

No engine changes and 4.10 gears and dual Flowmaster 40 cat-back exhaust !!

JIMBO
I recently put a flowmaster super 44 on mine, it sounds great.. Im terrified that the exhaust may be the problem even though i dont see how it possibly could be
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Old 03-12-2011, 11:15 PM   #8
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I forgot to mention im a stick shift, 3.73 gears
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Old 03-13-2011, 12:38 AM   #9
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Quote:
Originally Posted by Schwheelz

I recently put a flowmaster super 44 on mine, it sounds great.. Im terrified that the exhaust may be the problem even though i dont see how it possibly could be
Oh jeez what else did you forget to mention I'm just playing with you.

Did you install or Super 44 or did a shop do it? I'm asking because a bad exhaust flow will indeed rob you of MPG's and performance. I have trouble figuring out how a muffler can get installed wrong but you never know.

Are you factoring in offroad use into your MPG calculations? I mentioned I got 16mpg…but that's onroad only. I play in the woods 2-4 times a month, so my "real world" actual MPG is more like 13 or 14. This matches up with you. (you have 3.73 pushing 33's…I have 4.11 pushing 35)

Unless you've had a sudden decrease, don't worry. If so, do that key trick thing and see if you toss any codes. That muffler MIGHT be playing games with an 02, or the CAT, maybe that evap sh*t too. Bang your air filter on the ground too. If it's real nasty replace it.

That's really it for the cheap stuff. How many miles you got on the clock?
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Old 03-13-2011, 12:54 AM   #10
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Not joking...but fire up your jeep and get down by the tailpipe and suck it in

It smell normal?
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Old 03-13-2011, 07:11 AM   #11
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Quote:
Originally Posted by GroundHawg

Oh jeez what else did you forget to mention I'm just playing with you.

Did you install or Super 44 or did a shop do it? I'm asking because a bad exhaust flow will indeed rob you of MPG's and performance. I have trouble figuring out how a muffler can get installed wrong but you never know.

Are you factoring in offroad use into your MPG calculations? I mentioned I got 16mpg…but that's onroad only. I play in the woods 2-4 times a month, so my "real world" actual MPG is more like 13 or 14. This matches up with you. (you have 3.73 pushing 33's…I have 4.11 pushing 35)

Unless you've had a sudden decrease, don't worry. If so, do that key trick thing and see if you toss any codes. That muffler MIGHT be playing games with an 02, or the CAT, maybe that evap sh*t too. Bang your air filter on the ground too. If it's real nasty replace it.

That's really it for the cheap stuff. How many miles you got on the clock?
I installed the muffler myself so theres not a problem there, i dont know of this key trick your talking about though.

23,000 miles and the reason i posted is because i had a sudden decrease:P
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Old 03-13-2011, 07:13 AM   #12
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Quote:
Originally Posted by GroundHawg
Not joking...but fire up your jeep and get down by the tailpipe and suck it in

It smell normal?
It smells just fine to me... Not a bad idea, ill have a fewother people give it a shot! Im confused because theres definitely more airflow
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Old 03-13-2011, 08:23 AM   #13
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Is this ALL of a SUDDEN and one tank--could be a gas pump problem at the station-

I don't beleive in Flowmaster HP/mileage increases, but my 3.8 performance has gotten better since my Flowmaster 40 cat-back install. and as I said last week-coming back from Nevada from 4200 ft to 7000 ft to sea level the total (math) avg was 15.02 mpg and from Auburn to SF bay area the OBC showed 16.9 mpg (level 90 miles)-so unless you installed the FM backwards (heaven forbid), it's pretty unusual for it to be the muffler trouble-

Hope you find out soon what it is-

Good luck

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Old 03-13-2011, 10:11 AM   #14
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Did you use all six gears? j/k... lol!
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Old 03-13-2011, 11:40 AM   #15
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The key trick is how our Jeeps self diagnosis themselves.

While in the Jeep, push down the brake.

Now put your key in the ignition and turn it to ON 3 times quickly. The trick here is to turn it fast enough so the Jeep doesn't have time to chime. Push in on the key so it doesn't catch on any positions.

If you hear a chime, you're going too slow. If the motor cranks, you went far.

On the third turn, leave it in the ON position and watch the odometer. It'll either display codes, or say d0ne, which means no errors. Tell us any codes the Jeep displays.

Like the others...I'm thinking this isn't exhaust related. You did the install, and the exhaust smells normal. You've got a clogged air filter, or an 02 or MAP sensor or something of that sort going out I think.
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Old 03-13-2011, 11:52 AM   #16
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Was towing RV in my Silverado a few years back, developed a sudden loss of power & horrid mpg. Went camping at the beach for a few days and barely had the power to make it back over the Coastal range.

Got to my mechanics, they listened to my sad story, opened the hood & pulled out the air cleaner....flopped it down on the ground.....enough dirt fell out to plant a potato patch...

plus the fuel filter proved to be heavily contaminated....how both happened at once was never established....other than it was WAY too long since either had been serviced.
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Old 03-14-2011, 12:41 AM   #17
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Quote:
Originally Posted by JIMBOX
Is this ALL of a SUDDEN and one tank--could be a gas pump problem at the station-

I don't beleive in Flowmaster HP/mileage increases, but my 3.8 performance has gotten better since my Flowmaster 40 cat-back install. and as I said last week-coming back from Nevada from 4200 ft to 7000 ft to sea level the total (math) avg was 15.02 mpg and from Auburn to SF bay area the OBC showed 16.9 mpg (level 90 miles)-so unless you installed the FM backwards (heaven forbid), it's pretty unusual for it to be the muffler trouble-

Hope you find out soon what it is-

Good luck

JIMBO
We went through well over $200 of gas on the trip.. We got worse gas mileage than our 30,000lb diesel rv that we drove the same road on.
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Old 03-14-2011, 12:42 AM   #18
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Originally Posted by E64RIT
Did you use all six gears? j/k... lol!
I attempted to!
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Old 03-14-2011, 12:48 AM   #19
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Quote:
Originally Posted by JeeperJake
Was towing RV in my Silverado a few years back, developed a sudden loss of power & horrid mpg. Went camping at the beach for a few days and barely had the power to make it back over the Coastal range.

Got to my mechanics, they listened to my sad story, opened the hood & pulled out the air cleaner....flopped it down on the ground.....enough dirt fell out to plant a potato patch...

plus the fuel filter proved to be heavily contaminated....how both happened at once was never established....other than it was WAY too long since either had been serviced.
I know it makes sense to be the air filter.. But before the trip i made all the necessary adjustments for the trip,

Changed diff fluids, aired up tires, cleaned out air filter with a high pressure hose.

The only thing that i just remembered that was odd was the jeep needed some oil, i was semi low so i topped it off (2 quarts)... I just remembered this considering that while im typing this a man that just blew a head gasket drove by in his truck, now hes goingto need some oil in about 30 seconds and a tow truck in a minute :P
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Old 03-14-2011, 05:17 AM   #20
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Quote:
Originally Posted by JeeperJake View Post
Was towing RV in my Silverado a few years back, developed a sudden loss of power & horrid mpg. Went camping at the beach for a few days and barely had the power to make it back over the Coastal range.

Got to my mechanics, they listened to my sad story, opened the hood & pulled out the air cleaner....flopped it down on the ground.....enough dirt fell out to plant a potato patch...

plus the fuel filter proved to be heavily contaminated....how both happened at once was never established....other than it was WAY too long since either had been serviced.
All of my vehicles get a new air filter every 5000 miles when they get a drink of mobil one. Dirty are clean, doesn't matter they still get a new filter. Most of the dirt in a air filter is microscopic so you can't see it any way. If dirt falls out real big time you are in a bad need for a new filter. Fuel filters are run about 30 to 50 k if I have no problems.
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Old 03-14-2011, 05:24 AM   #21
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Talking

Oh took my jeep on her first road trip last week and she made 19.4 mpg on mostly all highway. And I am running them big massive 32 inch tires I think on massive factory 18 inch wheels, with 373 trace lock gears. Seems to pull real good down the road with cruse set to 75 mph even bucking some wind and only downshifts on long steep grades. I will never change tire size, cause you are just opening up a can of worms! If it ain't broke, don't fix it!
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Old 03-14-2011, 08:34 AM   #22
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Originally Posted by KSCRUDE

All of my vehicles get a new air filter every 5000 miles when they get a drink of mobil one. Dirty are clean, doesn't matter they still get a new filter. Most of the dirt in a air filter is microscopic so you can't see it any way. If dirt falls out real big time you are in a bad need for a new filter. Fuel filters are run about 30 to 50 k if I have no problems.
Not a bad thing to run by
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Old 03-14-2011, 08:35 AM   #23
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Oh took my jeep on her first road trip last week and she made 19.4 mpg on mostly all highway. And I am running them big massive 32 inch tires I think on massive factory 18 inch wheels, with 373 trace lock gears. Seems to pull real good down the road with cruse set to 75 mph even bucking some wind and only downshifts on long steep grades. I will never change tire size, cause you are just opening up a can of worms! If it ain't broke, don't fix it!
But its so fun...

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