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Old 12-30-2009, 11:44 AM   #1
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No engine power on a new JK unlimited

i just turned in a 2007 H2 SUT (lease expired) for 2010 Wrangler Unlimited Sahara. Afer driving it for only 150 miles i have to say i am disappointed in the performance of this Jeep. When I test drove the vehicle I drove the 2 door 6 spd and the auto and a 6 spd 4 door but end up buying the auto. The vehicle has no power. When you step on the pedal nothing happens. I love the look of the wrangler and was willing to accept the down grade of the interior compared to a Hummer but the power issue is distrubing me.
I read online that one of the problems is in the throttle response. Has anyone tried the Sprint Booster or a Superchip or a engine mod of any kind to help wake this engine up? I am thinking about bringing it back to the dealer and begging for and exchange to a vehicle with more power. Is there any remedy to this enging power problem? I'm not looking for a race car, need just enough power to drive it to work without being passed by a horse and buggy.

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Old 12-30-2009, 02:12 PM   #2
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This is because the pedal is electronic. You need to purchase a superchip to adjust it.

My 06 Unlimited was was very touchy to the pedal. My 09 LK is far less touchy and I was told it was because of the gas pedal being electronic.

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Old 12-30-2009, 02:33 PM   #3
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Jeep Wrangler JK Tuner Shootout - Jp Magazine


Go here, research, and make a decision!!! It's a pretty good article.
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Old 12-30-2009, 03:34 PM   #4
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Originally Posted by vincan View Post
i just turned in a 2007 H2 SUT (lease expired) for 2010 Wrangler Unlimited Sahara. Afer driving it for only 150 miles i have to say i am disappointed in the performance of this Jeep. When I test drove the vehicle I drove the 2 door 6 spd and the auto and a 6 spd 4 door but end up buying the auto. The vehicle has no power. When you step on the pedal nothing happens. I love the look of the wrangler and was willing to accept the down grade of the interior compared to a Hummer but the power issue is distrubing me.
I read online that one of the problems is in the throttle response. Has anyone tried the Sprint Booster or a Superchip or a engine mod of any kind to help wake this engine up? I am thinking about bringing it back to the dealer and begging for and exchange to a vehicle with more power. Is there any remedy to this enging power problem? I'm not looking for a race car, need just enough power to drive it to work without being passed by a horse and buggy.

I just passed 500 miles on my new '10 unlimited sahara and it really seems as though the engine in loosening up, pickup improving. I expect it will likely take at least 1,000 miles to loosen up and in the next 500 miles I'll be more aggressive on throttle input to encourage this. I also found the overdrive off button helps considerably in the 40-50 mph range. I'm just a newbie, but that's what my limited experience seems to be. Good luck
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Old 12-30-2009, 04:16 PM   #5
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but the power issue is distrubing me.

What really should be disturbing you is that you did not test drive the vehicle you purchased.
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Old 12-30-2009, 04:31 PM   #6
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For the best power delivery

you need a 2dr with the 6 spd tranny. It's the lightest of the Wranglers, and the 6 spd really takes advantage of the engine. I had an Unlimited Sahara with an auto and always felt like it couldn't get out of it's own way, made lots of revs and noise for precious little acceleration. I now have a 2dr X with 6 spd and it runs much better, and a 6spd 2dr Rubi on order, which is even better because it has 4.10 gears. Everything's a trade-off, though, as you can't beat the extra room of an Unlimited, and if it's a DD, 6 spd can get old.
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Old 12-30-2009, 07:36 PM   #7
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I agree with the complaints. I had an 03 Sahara 6 spd, 05 Rubi Unlimited 6 speed, now a '10 Sahara Unlimited Auto, and this '10 is the weakest of the 3. Often falls down shifted from 1st to 2nd. I love my jeep, but I hate how weak it is. I thought about headers, chips and stuff, but I don't think it'll make enough difference anyway, so I'm just going to live with it. Maybe someday we'll see a hemi wrangler.

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Old 12-30-2009, 08:04 PM   #8
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When I get on mine in 1st, it satisfies me. I didn't buy a sports car, I got a Jeep. I had to search for the standard both times in 08 that I got a Jeep. The first 08 had 3.21 gears. The second 08...my Rubicon has the 4.0:1 gears. It makes a difference off of the stop. The standard makes a difference in my opinion too. When I want to "get on it" to pass, with a standard I can choose to downshift 2 gears and it gets up and goes when I do that. To the auto owners out there try and have that discussion with the computer while trying to pass...giggle...giggle...snicker.
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Old 12-30-2009, 10:14 PM   #9
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I have a 2009 Sahara unlimited auto. And I have no problem with power and never any problems in the passing lane. ????? Maybe you need to learn to drive ?
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Old 12-30-2009, 10:28 PM   #10
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My '08 Rubi has no problem on the freeway, even pulling my trailer (Light) over the Sierras

You just have to learn how to use/notuse, the O/D button !!!


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Old 12-30-2009, 10:28 PM   #11
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I have a 2009 Sahara unlimited auto. And I have no problem with power and never any problems in the passing lane. ????? Maybe you need to learn to drive ?
If you have the towing package you have the lower gearing maybe? I hear the 3.21 gears tend to be sluggish in the auto. I had the towing package and the lower gearing with a standard on my Sahara Unlimited. I do notice a little difference in torque with the 4.0 gears in the Rubicon. It was worth the reduction in mpg though IMHO. Remember the OP may be used to the torque of his previous vehicle. It may be just a paradigm shift that has to be adjusted to. My guess is that the H2 has more umph but the jeep is probably more trail worthy in the physical size department.
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Old 12-31-2009, 02:48 PM   #12
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I had an H2 as well and lets face it. Its no speed demon either. Going from my Mustang GTCS to my 07 Jeep can be depressing when it comes to power. I have a 2DR with the 4:10 gears and auto. To further complicate the issue I added 3" and 35's. Its sluggish but I bought it to have fun offroad not on the freeway. First thing I would do is get a set of 4:56 or 4:88 gears which works well with 30,31 or 32" tires. If you have 33,34 or 35" tires take a look at the 5:13 or 5:38 gear sets. These gear sets are still freeway friendly and will give you back some of that torque your looking for. If thats not enough RIPP makes a supercharger that adds a solid 100 RWHP to the JK's 3.8l. Its a bolt on system that requires nothing. Simple and reliable. Good luck.
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Old 12-31-2009, 07:49 PM   #13
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Mine's an '08 with 11,100 miles.... they don't get better with mileage.

These engines are just 'dogs' at the lower RPM's. To get up the hills around here I yank mine down into second and turn the O/D off. Engine needs to scream at over 3,000 RPM to get any horsepower out of it. Worst part of the JK's are the puny engines in them, all else is fine.
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Old 01-01-2010, 09:25 AM   #14
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Mine's an '08 with 11,100 miles.... they don't get better with mileage.

These engines are just 'dogs' at the lower RPM's. To get up the hills around here I yank mine down into second and turn the O/D off. Engine needs to scream at over 3,000 RPM to get any horsepower out of it. Worst part of the JK's are the puny engines in them, all else is fine.
Strange. I have 16000 km's on my 2009 Sahara auto and I use it as my DD, half highway/town. Never do I have to shut o/d off or shift down to get more power. I have 3.73 gears and when I get on the highway I set cruise at 120km, no problem!!!!
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Old 01-01-2010, 10:10 AM   #15
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Regearing helps.
Keep the vehicle's strengths in mind though; this is what it excels at:


This is what an H2 excels at:
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Old 01-01-2010, 10:22 AM   #16
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Man, HD, that gold Hummer SUT looks stupid !!!

------------------WHEELS SHOULD BE BLACK------------------------

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Old 01-01-2010, 11:24 AM   #17
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Strange. I have 16000 km's on my 2009 Sahara auto and I use it as my DD, half highway/town. Never do I have to shut o/d off or shift down to get more power. I have 3.73 gears and when I get on the highway I set cruise at 120km, no problem!!!!
Are you a flat lander?
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Old 01-01-2010, 11:44 AM   #18
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i guess the problem with my new jeeps is that the V8 in the H2 had 125 more HP and I can feel it. As I see it either I get used to the lack of power or trade the vehicle in and lose $5000 or more. Nobody has offered a suggestion on how to increase the power other than changing the gear ratio.
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Old 01-01-2010, 12:05 PM   #19
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i guess the problem with my new jeeps is that the V8 in the H2 had 125 more HP and I can feel it. As I see it either I get used to the lack of power or trade the vehicle in and lose $5000 or more. Nobody has offered a suggestion on how to increase the power other than changing the gear ratio.
Yah, looks like you got the skinny of it. The power plant is what it is. I use mine off road as much as I am able to and it performs there very nicely including crawling real slow when necessary even as a stock jeep, it does well.
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Old 01-01-2010, 12:32 PM   #20
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Lack of Power

I had a Chevrolet Tahoe before I got my Jeep. The Tahoe sounded cooler with the 5.7 liter V-8 but it was speed limited to 100mph so it wasn't any faster than my jeep is now. I can live with the lack of horsepower because the Jeep can get me through places the Tahoe just could not go; and it is way funner to drive. I don't know what a Hummer drives like but I have no complaints on my Jeep. I do have the factory tow package so I don't know how much of a differance the tow package gears make.
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Old 01-01-2010, 12:40 PM   #21
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This is a short video of us and some friends last weekend. See if you can guess which JKs were reageared, especially the big red one toward the end.
Gears make a huge difference.

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Old 01-01-2010, 01:42 PM   #22
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Regearing counts for EVERYTHING, when you increase the tire size, over stock issue

Lockers and a lower crawl ratio counts in mud/snow/shale (rubicon)

Quote:
Front lockers and SLOW CRAWL got me up this shale climb

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Old 01-02-2010, 12:06 AM   #23
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Impressive Jimbo.
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Old 01-02-2010, 10:34 AM   #24
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Thanx jk'n, I probably should have aired down to, but I was being too lazy, my wife and I were just fishing !!


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Old 01-05-2010, 11:11 PM   #25
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i guess the problem with my new jeeps is that the V8 in the H2 had 125 more HP and I can feel it. As I see it either I get used to the lack of power or trade the vehicle in and lose $5000 or more. Nobody has offered a suggestion on how to increase the power other than changing the gear ratio.
can't think of the company name right now, but you can do the hemi conversion, end of discussion!
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Old 01-05-2010, 11:38 PM   #26
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This is a short video of us and some friends last weekend. See if you can guess which JKs were reageared, especially the big red one toward the end.
Gears make a huge difference.

not discounting the difference gears makes, but in this hill climb I see other issues that played more of a role
AT tires, not aired down, and lockers.
the stock yellow TJ at first just drove the crap out of his rig and made it. the H3 and the stockish JK both could've benefited from some MT's or at least some decent AT's, at the bare minimum airing down would have helped a bit as well. honestly the owner of the stock burgundy JKu could have spent the money on that front bumper on something a little more useful like some better tires. having the tires he has, he wont be able to make it anywhere that bumper would be needed.


back on topic. regearing will make all the difference in the world. I have a friend with an 07 2dr RUBI and he never had anything positive to say about how his jeep ran until he regeared it to 4.88's. even on 35's he says he can drive it like a hot rod and get the rear tires to break loose in turns.
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Old 01-06-2010, 05:06 AM   #27
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not discounting the difference gears makes, but in this hill climb I see other issues that played more of a role
AT tires, not aired down, and lockers.
the stock yellow TJ at first just drove the crap out of his rig and made it. the H3 and the stockish JK both could've benefited from some MT's or at least some decent AT's, at the bare minimum airing down would have helped a bit as well. honestly the owner of the stock burgundy JKu could have spent the money on that front bumper on something a little more useful like some better tires. having the tires he has, he wont be able to make it anywhere that bumper would be needed.
My climb with MTR/k tires and 4.56 gears:



Stumpy with Trxus MT and stock 3.07 gears:

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Old 01-06-2010, 06:43 AM   #28
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I just got an 2010 and I understand the concern over the lack of power. But partly I think its good to remember you can't have your "kate and edith too." This wasn't designed to be a hot rod. It does what it was designed to do very well. My Mustang GT with nitrous was terrible off-road and on rough terrain where the gearing was low. I complained in the Mustang forum about how bad it was off-road. So I imagine there are a few things you can do to make the Jeep a little quicker but remember it may not produce the results you seek and there is a trade-off for everything you do. Rots-a-ruck.
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Old 01-06-2010, 07:03 AM   #29
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HD: stumpy only has 3.07 gears??? with all the gear and techy stuff he has in that xj and he hasnt regeared it yet?? im going to have to rag on him over at NAXJA lol
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Old 01-06-2010, 07:12 AM   #30
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HD: stumpy only has 3.07 gears??? with all the gear and techy stuff he has in that xj and he hasnt regeared it yet?? im going to have to rag on him over at NAXJA lol
He's got one axle in the garage with 4.56s in it and is waiting for funds to regear the rear; he'd also like to lock it at the same time rather than pulling it apart again.
We need to find the boy a job too; he's still looking since coming back from Germany.

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