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  #1  
Old 10-05-2011, 04:48 PM
Superdave450 Superdave450 is offline
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Default 4th gen trucks surging/shuddering at idle?

Hey guys I've had a 2010 for 20 minths now. When the truck was new it used to surge or shudder at idle when you just took your foot off the brake and let it roll. It didn't do it all the time and couldn't get it to do it for the dealer. Eventually it went away but once in awhile its still fainly there. i recently took a new 2011 for a drive and sure enough it did it just like when mine was new. Has anyone one else noticed this? is it an issue? I always figured it was something in the tranny. The engine RPMs always stay steady.
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Old 10-06-2011, 01:54 PM
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I never noticed that on mine.
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Old 10-13-2011, 10:58 AM
shujat shujat is offline
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Superdave, that is crazy, I notice the same thing! A matter of fact as soon as I posted the same thing, I saw your post, so I had to reply, thinking I was going crazy! My guess its a late downshift, but I have no idea either and its concerning me too.
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Old 10-13-2011, 11:16 AM
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Minagera Minagera is offline
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I notice mine does it when the MDS cuts in. Also I have noticed on mine at a stop, in gear, when it idles down to 500 rpm it does a shutter like it has a miss. I think the MDS is kicking in there too, but I could be wrong.
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Old 10-13-2011, 09:16 PM
Superdave450 Superdave450 is offline
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It's not the MDS. At idle the MDS wont come on. I figured it's just another Ram quirk and not a big deal. It is enoying however.
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Old 10-19-2011, 04:11 PM
Guzoontite Guzoontite is offline
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I have a 2011Ram1500 with the 5.7L. About 50% of the time when I am driving and come to a stop, the idle will drop down to 500 rpm. The other half of the time, it will idle at the "normal" rpm (about 700 rpm). One pattern I have noticed is that it will only go down to 500 rpm if the AC is off, but it does not happen every time the AC is off and it only drops down to 500 rpm is when I am driving and come to a stop. When it is idling at 500 rpm, if I shift into any other gear (i.e. neutral, rev, park) it will immediately go back up to 700 rpm and stay there, even when I put it back into drive. The same thing happens if touch the gas paddle at all, it will idle back up to 700 and stay there.

As a side note, when it is idling at 500 rpm, it is not running rough or anything. It is still running just as smooth as when it idles at 700 rpm. The only difference I notice is at 500 rpm there is a noticeable engine power drop. For example, when I am sitting still and I let off the brake, the truck will not move forward as quickly as when its idling at 700 rpm, and depending on the grade of the road it may not even roll forward at all.
Has anyone else noticed this issue? Could it be a problem or is it normal for this truck? Any help would be much appreciated.

Last edited by Guzoontite; 10-19-2011 at 04:13 PM.
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Old 10-24-2011, 11:30 PM
Fyrmedic510 Fyrmedic510 is offline
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I have noticed this on my truck. It only happens on morings or after the truck is completely cold. When I leave for work in the morning, I usually start the truck, let it sit for 1-2 minutes, then go. When I hit the first stop sign from my house and any stop light until the truck begins to warm, I get the surging. Its only when I take the foot off the gas and start rolling, its a constant shudder/ surge. If I hit the gas, it goes away, and if I stop, it goes away and idle smooth. Very weird haha. Seems to be like just a quirk. It has never done it when warm, or the engine has fully warmed up. Only cold starts.
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Old 10-25-2011, 12:23 AM
ken99 ken99 is offline
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I don't want to hear this. My personal 2010 hasn't exhibited this problem, but I have 2001 RAM 1500 work truck that did this shutter at idle thing from day one. Eventually turned out to be a defective torque convertor that I replaced at ~65,000 miles, beyond the existing 2001 warranty. I'll try to see if I can remember the error code and description that eventually manifested.
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Old 10-28-2011, 01:16 AM
Fyrmedic510 Fyrmedic510 is offline
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Quote:
Originally Posted by ken99 View Post
I don't want to hear this. My personal 2010 hasn't exhibited this problem, but I have 2001 RAM 1500 work truck that did this shutter at idle thing from day one. Eventually turned out to be a defective torque convertor that I replaced at ~65,000 miles, beyond the existing 2001 warranty. I'll try to see if I can remember the error code and description that eventually manifested.
That would make sense, seeing as a lot of people on here are having torque converter issues. I could see that being it, but I will try and keep updates coming in. I only have 700 miles on the truck and hope to never hear the grind/ growl from the TC that some are hearing. Strange though that it only does it for the first 5-10 minutes until it gets warm. Then smooth as butta! It doesn't really bother me, as long as it doesn't do it all the time.
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Old 10-28-2011, 01:25 AM
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My '09 does the 500 & 700 rpm thing whether it is at the first Stop sign or the 40th
I just thought it a strange occurrence & i don't worry about it
My mileage is now over 50,000 miles
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