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Old 10-06-2010, 11:01 AM
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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.
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Old 10-06-2010, 11:03 AM
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Re: Erratic jerking while cruising

what weight oil aare you using? Could be the MDS...
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Old 10-06-2010, 11:08 AM
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Re: Erratic jerking while cruising

I have 5W30 oil, 5W20 is impossible to source in Dubai.
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Old 10-06-2010, 11:20 AM
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Re: Erratic jerking while cruising

wow.....thats crazy..all that oil in the middle east and no 5w20?
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Old 10-06-2010, 11:21 AM
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Re: Erratic jerking while cruising

have you tried resetting the throttle control?
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Old 10-06-2010, 11:33 AM
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Re: Erratic jerking while cruising

Quote:
Originally Posted by Scottina06 View Post
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.
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Old 10-06-2010, 11:42 AM
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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?
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Old 10-06-2010, 12:30 PM
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Re: Erratic jerking while cruising

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Originally Posted by mmain View Post
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!
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Old 10-06-2010, 08:03 PM
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Re: Erratic jerking while cruising

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
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Old 10-06-2010, 08:06 PM
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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
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Old 10-06-2010, 08:36 PM
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Re: Erratic jerking while cruising

Quote:
Originally Posted by Marlin View Post
"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
beat me to it
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