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  #25  
Old 09-24-2011, 03:38 AM
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Re: Jerking motion upon engine start? Easy fellas

Quote:
Originally Posted by Deserthucker View Post
First safety
We all should be using the park brake(E Brake) every time we park. Then you will not notice the jerk..
+1. use the park-brake.
The v6 also does it once in a while. Looks to me it is related on how it is parked before shutoff. When park-brake is applied before putting gear in P, there seem to been no bump at startup.
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  #26  
Old 09-25-2011, 08:10 PM
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Re: Jerking motion upon engine start? Easy fellas

This has scared the crap out of me on a couple instances as well. I have watched it jump forward 2-2.5 inches up an incline and roll back. I was demonstrating the remote start to a co worker sitting outside at a luncheon and my stomach shot up to my throat as it came .5 inches from hitting a "Reserved Parking" sign pole on the bumper..I have wondered ever since if some day it while jump in gear and not engage the park pawl at all and simply drive away. Lawsuit???
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  #27  
Old 09-25-2011, 08:11 PM
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Re: Jerking motion upon engine start? Easy fellas

I love this car but for gods sake, please no more issues!!!
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  #28  
Old 09-25-2011, 08:45 PM
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Re: Jerking motion upon engine start? Easy fellas

My 2011 Grand Cherokee Overland V6 did the lunge as well. Intermittent but scary.
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  #29  
Old 02-10-2012, 02:20 PM
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Re: Jerking motion upon engine start? Easy fellas

Mine has done this a few times. Its a V6. 900 miles on it.
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  #30  
Old 02-10-2012, 03:16 PM
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Re: Jerking motion upon engine start? Easy fellas

I've never noticed this before, but I keep my foot on the brake during start-up until I shift into gear.
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  #31  
Old 02-10-2012, 04:24 PM
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Re: Jerking motion upon engine start? Easy fellas

You have to keep your foot on the brake. You cant start the vehicle without your foot on the brake.

You can feel it. I dont think the vehicle moves any noticable amount. Its like when you stop and the wheels are planted but the momentum still brings the body up a little. Thats what its like. I will mention it to the dealer so I can have it in writing in case one day it goes ape sh!t. LOL
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  #32  
Old 02-10-2012, 04:35 PM
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Re: Jerking motion upon engine start? Easy fellas

Quote:
Originally Posted by mistadobalina View Post
You have to keep your foot on the brake. You cant start the vehicle without your foot on the brake.
I'm well aware of that, which is why this has never happened to me. People having their Jeeps surge 3" must be taking their foot off the brake right after they press the start button.
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  #33  
Old 02-10-2012, 10:39 PM
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Re: Jerking motion upon engine start? Easy fellas

or using remote start
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  #34  
Old 02-11-2012, 11:10 AM
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Re: Jerking motion upon engine start? Easy fellas

Never seen it happen with remote start either...
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  #35  
Old 02-12-2012, 04:16 AM
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Watched mine leap forward with remote start on the ice yesterday. It was a big enough Jerk that it actually slid 1.5"-2". Now I know it does not sound bad but that ain't right! Honestly it's not like the dealer will ever find the problem so it's not worth my time for them to Jerk me around. If anything I will bring it in and have them make notice of it every oil change this way if something ever does happen (not likely) I will be able to blame JEEP
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  #36  
Old 02-14-2012, 09:32 AM
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Re: Jerking motion upon engine start? Easy fellas

Case Number: S1121000013
Release Date: 09/07/2011
Symptom/Vehicle Issue:
At start up, the customer may complain of a vehicle bump or the vehicle feels as though it lunges.
Discussion:
The MP3023 two-speed transfer case is an "on-demand" active four-wheel drive transfer case that provides optimum traction for a wide range of conditions, while maximizing driver convenience. When operating in 4WD Auto mode, this sophisticated system anticipates and prevents slip by redirecting torque as necessary through the use of an internal clutch.
If a turn is made, there will be a slight difference in rolling radius between the front and rear axles. The difference in rolling radius results in the axles rotating at different speeds. If the driving conditions or road surface requires the 4WD system to engage, the application of the transfer case clutch will attempt to prevent the axles from turning at different speeds. This will cause the driveline to "wind up." The extreme case of this is "crow hop" which is the binding experienced when making a tight turn while driving in low range when the transfer case is locked.
In high range, the clutch is automatically applied during various driving situations. If the clutch is applied while the vehicle is brought to a stop and there is any driveline windup present, the clutch will actually hold the vehicle in position after the transmission is shifted to park. In this specific situation, driveline windup is holding the vehicle stationary, not the park pawl.
By design, if the transfer case clutch is engaged when the ignition key is turned to OFF, the system leaves it engaged. This is a precautionary measure to ensure that if four wheel drive was required to get to a specified location, the transfer case remains in 4WD with the ignition key OFF so that the parking system is more effective due to the additional traction that the front wheels can provide.
On the next ignition cycle sequence, the system now has to reestablish the proper high range default position. The transfer case may move the clutch back to the default starting position, getting it ready for the next drive cycle. Because the clutch may have had to be released, the driveline would then "un-wind" allowing the parking pawl to hold the vehicle stationary. When this occurs, the customer may experience a slight bump or it may feel as the vehicle lunges at start up. This condition is normal and cannot be eliminated.



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