Jeep Garage  - Jeep Forum

Jeep Garage - Jeep Forum (http://www.jeepgarage.org/forums.php)
-   Grand Cherokee - WK (http://www.jeepgarage.org/f5/)
-   -   Dead-spot in gas pedal on my '05..... (http://www.jeepgarage.org/f5/dead-spot-in-gas-pedal-on-my-05-a-5188.html)

SPECIALED 12-31-2009 08:10 PM

Dead-spot in gas pedal on my '05.....
 
I seem to have this annoying dead-spot in my 2005 grand cherokee when i get to around 40 mph. I have the 5.7 liter hemi. Has anyone else experienced this? The only way to get the car moving is to put the pedal to the floor. Is this the overdrive or is it something else that needs looking into? The only mod i've done so far is flowmaster 50 series exhaust. Should i get a tuner and see if it solves the problem? Could also be time for new plugs & wires. Any advice is greatly appreciated.

HEMIBeast 12-31-2009 08:14 PM

Re: Dead-spot in gas pedal on my '05.....
 
It's most likely MDS kicking in. MDS kicks in between 40-60 mph and can be disabled with a diablo predator.

dreamer1213 12-31-2009 08:14 PM

Re: Dead-spot in gas pedal on my '05.....
 
Dead spot in the gas pedal...well...first time I've ever heard of that.

Perhaps you need to reset the PCM? Since your throttle body/gas pedal is controlled by the computer and not a cable. May be there is just a glitch somewhere. Undo the battery for like 15 mintues and put it pack together and see if that fixes it..

Scottina06 12-31-2009 08:16 PM

Re: Dead-spot in gas pedal on my '05.....
 
sounds like the typical 5.7 slow throttle repsonse. I have heard from 5.7 owners that there is a delay. It could also be the mds if yoiu are cruising on the highway

hemi.jon 12-31-2009 08:16 PM

Re: Dead-spot in gas pedal on my '05.....
 
i think i know what your talking about, if your aiming at the sluggish accel around that speed its normal. just the tranny being to low in RPMs to provide the ass, but the jeep wont downshift unless you peg it. its a fuel econ thing with the tranny control i believe. i used auto stick to speed past it.

jeepgcoman 12-31-2009 09:28 PM

Re: Dead-spot in gas pedal on my '05.....
 
Mine used to do this too. Very annoying. Here's my take on it. At that speed (around 40 mph) at light throttle is when the transmission is going nuts, IMO. It's right at/after the 3-4 shift point, MDS may or may not be trying to cycle, and the converter clutch may or may not be trying to kick in. Any slight throttle movement causes it to attempt to reverse some or all of these actions. If you have the MDS "ON" light you can see when the MDS cycles, and feel when some of the other actions occur. I have the Superchips tuner which has pretty much eliminated the problem by modifying the shift schedule and MDS parameters. I run the 91 tune. I also have a Dash Hawk on order. With that I'll be able to further monitor engine and trans. activities. I've got it on my Hemi Magnum and it's a must, IMO.

HEMIBeast 12-31-2009 09:33 PM

Re: Dead-spot in gas pedal on my '05.....
 
He has an 05 and there's no MDS light that shows when MDS is engaging. The problem isn't the transmission going nuts. It is MDS engaging.

iJeep 12-31-2009 09:49 PM

Re: Dead-spot in gas pedal on my '05.....
 
One word, autostick.

sanitarium16 12-31-2009 10:18 PM

Re: Dead-spot in gas pedal on my '05.....
 
same issue with my 4.7. They have a TSB for this and i had it done but it still does it just not as bad. I had superchips apply this TSB to my tune as well.

HEMIBeast 12-31-2009 10:20 PM

Re: Dead-spot in gas pedal on my '05.....
 
Is the TSB on the 5.7's as well? I haven't seen it.

HEMIBeast 12-31-2009 10:25 PM

Re: Dead-spot in gas pedal on my '05.....
 
2005-2010 TSB

http://www.wkjeeps.com/wk_tsb.htm

HEMIBeast 12-31-2009 10:27 PM

Re: Dead-spot in gas pedal on my '05.....
 
That TSB is for the 4.7 not the 5.7.

18-004-0902/06/09FLASH: HESITATION FEEL BETWEEN 38 TO 45 MPH (4.7L)
(superseded by 18-004-09b dated 10/30/09) X 18-004-09a04/01/09FLASH: HESITATION FEEL BETWEEN 38 TO 45 MPH (4.7L)
(superseded by 18-004-09b dated


All times are GMT -5. The time now is 11:18 AM.

Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community