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-   -   Erratic jerking while cruising (http://www.jeepgarage.org/f5/erratic-jerking-while-cruising-13661.html)

mmain 10-06-2010 11:01 AM

Erratic jerking while cruising
 
I have a 2005 Hemi 5.7, which has a noticeable jerking motion (to the driver) whilst cruising at say 40-60 mph. It is as though the vehicle is behaving like I was moving the gas pedal rapidly back and forth, which of course I am not. Any suggestions where to start looking? No fault codes evident.

Scottina06 10-06-2010 11:03 AM

Re: Erratic jerking while cruising
 
what weight oil aare you using? Could be the MDS...

mmain 10-06-2010 11:08 AM

Re: Erratic jerking while cruising
 
I have 5W30 oil, 5W20 is impossible to source in Dubai.

Scottina06 10-06-2010 11:20 AM

Re: Erratic jerking while cruising
 
wow.....thats crazy..all that oil in the middle east and no 5w20?

Scottina06 10-06-2010 11:21 AM

Re: Erratic jerking while cruising
 
have you tried resetting the throttle control?

SvenskaJeepGuy 10-06-2010 11:33 AM

Re: Erratic jerking while cruising
 
Quote:

Originally Posted by Scottina06 (Post 280159)
wow.....thats crazy..all that oil in the middle east and no 5w20?

all that oil, but no refineries. i am sure you can locate it through some kind of car dealer over there.

mmain 10-06-2010 11:42 AM

Re: Erratic jerking while cruising
 
Even the dealers don't stock 5W20 here, in fact they offer 5W40, although you can find 5W30 with a little effort in oil change shops. How do I reset the throttle control?

StoneCold 10-06-2010 12:30 PM

Re: Erratic jerking while cruising
 
Quote:

Originally Posted by mmain (Post 280173)
Even the dealers don't stock 5W20 here, in fact they offer 5W40, although you can find 5W30 with a little effort in oil change shops. How do I reset the throttle control?

Same here. Dealers only have 5w40. And we've no excuses. The oil rig is about 150 miles away and the refinery only 50!:confused:

jeepgcoman 10-06-2010 08:03 PM

Re: Erratic jerking while cruising
 
1 Attachment(s)
IMO, it is probably the MDS. It will not work properly with a heavier oil. The dealer put 10W-30 in mine when I bought it, and when it worked, it was alot like what you're describing. Try driving it in 4th and see if it goes away. Bet it does. There is, however, another possibility though. It could be the EGR valve going bad. If it's the EGR valve though, it'll probably surge at low speeds/light throttle (20-40 mph) too. How many miles on it? If driving in 4th doesn't make it go away. Also, are you getting an MIL's or DTC's.

Since you have an 05, you may want to add an MDS "ON" light. I came up with this almost 5 years ago when I was active in the LX forums and wanted to know when the MDS was active on my Hemi Magnum. Here's the "how to" reference, if you're interested. It will work on 05-07 Hemi's. It was one of the first things I added it to my 06 GCO.

http://www.lxforums.com/board/showth...ight=MDS+light

Marlin 10-06-2010 08:06 PM

Re: Erratic jerking while cruising
 
"Erratic jerking while cruising"?

I do it all the time, mainly when there's a really hot girl in a sports car cruising beside me on the freeway :D

Devilsmed98 10-06-2010 08:36 PM

Re: Erratic jerking while cruising
 
Quote:

Originally Posted by Marlin (Post 280451)
"Erratic jerking while cruising"?

I do it all the time, mainly when there's a really hot girl in a sports car cruising beside me on the freeway :D

beat me to it :p


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