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Topic Review (Newest First)
04-07-2012 11:19 AM
thomslife I am having the same problem when shifting into 4th and 5th. Not all the time and from what I have read it is not a fuel issue but a engine management issue (ECU?). I can not get it to reproduce itself for the dealer. I do have a habit of babying the thing so I will try to be a little more agressive.

2011 JK with 11,000 miles.
01-11-2012 09:54 PM
yingxuy I do some digging around some more experience, more than others, usually more, if your jeep is babied conclusion. ECU should learn your driving style, and make appropriate adjustments.
01-10-2012 06:57 AM
andre1002
Quote:
Originally Posted by kjeeper10 View Post
The Official Superchips Forum

Read this and tell me what you think.

I had/have the same issue at times. More so in the summer.
Yesterday I filled up at Mobile. Happened twice. I got this nasty hesitation-not sure what gear-was either 3rd or fourth.

Originally I thought it was the DBW delay. But that is now min with my SB/SC combo
Pretty intresting to see that so many people have the same problem and when I go to the dealership the service manager clames hes never heard of the problem. I find that hard to belive. I would try the SC/SB combo but SC isnt supporting the 2011's yet.
01-10-2012 05:51 AM
kjeeper10 http://www.superchips.com/forum/view...=8799&start=15

Read this and tell me what you think.

I had/have the same issue at times. More so in the summer.
Yesterday I filled up at Mobile. Happened twice. I got this nasty hesitation-not sure what gear-was either 3rd or fourth.

Originally I thought it was the DBW delay. But that is now min with my SB/SC combo
01-10-2012 05:09 AM
SeaComms Mine has just started doing it - cruising slowly at a constant 60km/hr (bout 35mph) in 4th is the most noticeable. So peddle is steady, flat road etc, and it feels like it misses every now and then.

It only started doing it after the last fill up, so I am thinking it may be fuel related. Missus just filled up today at a different servo so will see if it makes any difference.
01-10-2012 03:50 AM
andre1002 Sorry to bring up this old thread but, I just started having this problem again for the 3rd time in the last few months. The dealer said they dont know what is causing it and so they dont know how they would even correct the problem. They did acknowledge there is a studder and that its not normal.. Did anybody here figure out what is causing this? Throttle by wire? driving like a pansey? High altitude driving? All of the above? Damm its very frustrating.
09-08-2011 04:42 PM
Celtic I don't have that problem and my son son tells me I really baby it because I rarely shift above 2200 RPMs. I get 21 - 25 MPG city - highway consistently.

Mine is a 2011 JK 2 dr 6 speed with 3.21s and stock wheels and tires.

It has a little over 12000 miles on the odometer. I use any gas that's available.

I have driven / owned racing Corvettes, Camaros, CTSs and many other highly throttle responsive vehicles so I recognize hesitation when it happens.

As I mentioned above, my Jeep does not hesitate. I hope the OPs dealer gets to the bottom of it in case it happens to any one else down the road.
09-08-2011 03:46 PM
RB-10rubicon Mine did it again yesterday but went away this morning i drove alittle more aggressive after i felt it
09-08-2011 03:24 PM
ESP Thanks for the update.
09-08-2011 03:21 PM
danzy55 Well stopped by a local dealer yesterday explained the issue and had a tech ride with me and drive it, he agreed and felt the hesitation when shifting but had no clue as to what was going on....??? I'll be dropping it with them for a few days to get some warranty paint issues fixed and they are going to look into it. I'll post once I pick it up and see let you know if they consider this normal.
09-07-2011 12:32 PM
kjeeper10 Read this and tell me what you think.
Now- I'm not trying to push this thing on anybody. gives a pretty good idea on what
I'm talking about.

http://project-jk.com/jeep-jk-write-...rite-up-review
09-07-2011 12:23 PM
kjeeper10
Quote:
Originally Posted by ESP123
Here's what it feels like. Your accelerating holding the gas pedal down with constant force. The RPMs are climbing and you continue to hold constant force against the gas. The Jeep reaches said RPMs and it feels like a rope is being pulled on your jeep from behind for a split second. It's noticeable and the jeep slows down for a second while your still accelerating. Pushing the clutch in or letting off the gas pedal after this happens stops it and it feels normal then on for the other gears.
I agree, what if you (in neutral) step on the gas, there should be a slight delay. It does
Feel like a hesitation like described. It only happens when you let of the throttle and apply again (in between gears).
When I removed the booster, I tried just "getting on it" like people say to do. I can't mimic what this thing does. Still a hesitation or delay, very annoying IMO
I very used to the direct throttle that was in my Tj.
09-07-2011 11:26 AM
ESP Here's what it feels like. Your accelerating holding the gas pedal down with constant force. The RPMs are climbing and you continue to hold constant force against the gas. The Jeep reaches said RPMs and it feels like a rope is being pulled on your jeep from behind for a split second. It's noticeable and the jeep slows down for a second while your still accelerating. Pushing the clutch in or letting off the gas pedal after this happens stops it and it feels normal then on for the other gears.
09-07-2011 09:52 AM
kjeeper10 In all seriousness..

I think it all depends on what you drove previous to the jeep, for most complaints come from Tj owners. No secret that the jk has a slight delay in throttle response. How I understand it is, the JK throttle response was programmed in the ECU to help with the "jerkiness" complaints when off road.
I never thought my Tj was "jerky" but then again, some don't feel the delay in the Jk. I think it all depends on how you drive also. I'm heavy on the gas to start but let off and drive the speed limit just cruising.

Appologies if this makes no sense, I'm trying
09-07-2011 09:38 AM
daggo66
Quote:
Originally Posted by kjeeper10 View Post
The complaints come from jeeps with lower miles, unless there is a known problem, I can't see the filter being it. Those filters are in the tank and supposed to last for a very long time.

Will see what his dealer says
I agree. I wasn't saying that I thought it was the fuel filter, just saying age has nothing to do with it. I have never noticed any of the hesitation you guys are talking about.
09-07-2011 09:10 AM
kjeeper10
Quote:
Originally Posted by ESP123
Thanks for the response Kjeeper. I'm interested to see what he finds out after taking to the dealer today too. The same problem can sometimes get several "this is what causes it from dealers and others". I think the part about babying it may have something to do with it as that is pretty much what I've done. I don't jack rabbit start it and I accelerate slowly. I've done this since I bought it brand new so that may be part of it. However, I don't switch gears around 2500rpms. I do a little higher as mentioned. The stuttering happens when accelerating through 2400-2600 prior to shifting. Is it more likely that it may be the fuel filter then Daggo?
The complaints come from jeeps with lower miles, unless there is a known problem, I can't see the filter being it. Those filters are in the tank and supposed to last for a very long time.

Will see what his dealer says
09-07-2011 08:59 AM
ESP Thanks for the response Kjeeper. I'm interested to see what he finds out after taking to the dealer today too. The same problem can sometimes get several "this is what causes it from dealers and others". I think the part about babying it may have something to do with it as that is pretty much what I've done. I don't jack rabbit start it and I accelerate slowly. I've done this since I bought it brand new so that may be part of it. However, I don't switch gears around 2500rpms. I do a little higher as mentioned. The stuttering happens when accelerating through 2400-2600 prior to shifting. Is it more likely that it may be the fuel filter then Daggo?
09-07-2011 08:54 AM
kjeeper10
Quote:
Originally Posted by daggo66
Well then you should have mentioned sooner that Evan the sales guy said it was normal.
Evan the sales boy was a cool cat
09-07-2011 08:53 AM
kjeeper10
Quote:
Originally Posted by daggo66
Have you guys tried getting the RPM's up a little more before shifting? 2500 is a little low unless you are cruising on flat ground or going downhill.
Very true also, 2800-3000 is where I shift
09-07-2011 08:52 AM
daggo66 Well then you should have mentioned sooner that Evan the sales guy said it was normal.
09-07-2011 08:50 AM
kjeeper10 Ok.. Let me make it more clear.

It is NORMAL, this was one of the first questions I asked Evan, the sales guy, 2 days after I bought my 07 "why does it hesitate when I change gears around 2000-2500" he told me it was completely normal and a complaint that's brought up often. Ok-fill me in? "what your feeling is the slight delay in throttle caused by the drive by wire thats innewer vehicles"
I did some more digging around and came to the conclusion that some experience it more than others, usually more if your jeep is babied. The ECU is supposed to learn your driving style and adjust accordingly.
After a while it gets let's pronounces or some just get used to it.
I did not, programmers will also better the throttle response, I was inpatient and really did not want a tuner for my 6 speed, that's why I bought the SprintBooster. Night and
Day-instant throttle response, problem solved
09-07-2011 08:41 AM
daggo66 Have you guys tried getting the RPM's up a little more before shifting? 2500 is a little low unless you are cruising on flat ground or going downhill.
09-07-2011 08:40 AM
daggo66
Quote:
Originally Posted by Motorbreath View Post
No way a fuel filter goes bad that fast, unless you put 75k on it in the past year. Even if it was the fuel filter, you would notice it all the time not just between certain gears. Acceleration would be sluggish all around. Nice input though, not trying to bash. Merely my 2 cents.
Fuel filters don't "go bad", they clog. Debris in the fuel can clog a brand new filter.
09-07-2011 08:32 AM
ESP
Quote:
Originally Posted by danzy55 View Post
ESP123 I have the exact issue right around 2500rpm and just seems to be from 2-3 and 3-4th. I'm going to run by the dealer today and get their 2 cents I'm sure they will say that's normal..
When I get back I'll post what the dealer has to say about it, gotta go in anyway since I have some factory paint issues to get taken care of, makes you wonder if anyone at the Jeep plant does final inspection.

Thanks everyone for the input glad I'm not the only one unfortunately that has this issue.
Lets us know what you find out danzy55.
09-07-2011 08:24 AM
danzy55 ESP123 I have the exact issue right around 2500rpm and just seems to be from 2-3 and 3-4th. I'm going to run by the dealer today and get their 2 cents I'm sure they will say that's normal..
When I get back I'll post what the dealer has to say about it, gotta go in anyway since I have some factory paint issues to get taken care of, makes you wonder if anyone at the Jeep plant does final inspection.

Thanks everyone for the input glad I'm not the only one unfortunately that has this issue.
09-07-2011 06:50 AM
kjeeper10
Quote:
Originally Posted by Thracks
It's probably just the way the engines are. My Wrangler does that same thing. It suddenly gets a burst of power 2 seconds after the shift.
Throttle by wire bullshat,

It bothered me more coming from driving a Tj. If that's what these guys are experiencing-dunno.

1or2 sec delay makes the jeep feel sluggish . Even just maintaining a speed, I have to be on the throttle, It's annoying.

Love the SprintBooster-googleit
Best (only) mod I've done so far.
Makes my jeepy more alive.

It boost the throttle response. I removed it when my jeep when in for service, those 2 days were horrible love the thing.

.
09-07-2011 03:56 AM
Thracks It's probably just the way the engines are. My Wrangler does that same thing. It suddenly gets a burst of power 2 seconds after the shift.
09-06-2011 07:36 PM
ESP
Quote:
Originally Posted by Motorbreath View Post
After 45 mins?
Yep.
09-06-2011 07:00 PM
kjeeper10
Quote:
Originally Posted by Motorbreath

No way a fuel filter goes bad that fast, unless you put 75k on it in the past year. Even if it was the fuel filter, you would notice it all the time not just between certain gears. Acceleration would be sluggish all around. Nice input though, not trying to bash. Merely my 2 cents.
Agree.
09-06-2011 06:57 PM
Motorbreath
Quote:
Originally Posted by Razinhell
In my arm chair mechanic experience is it possible that the fuel filer can sometimes cause problems such as this? I know in diesels anytime we experience some sort of stutter under acceleration, some have found relief after changing out a fuel filter.
No way a fuel filter goes bad that fast, unless you put 75k on it in the past year. Even if it was the fuel filter, you would notice it all the time not just between certain gears. Acceleration would be sluggish all around. Nice input though, not trying to bash. Merely my 2 cents.
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