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rough idle 2012 sierra 5.3

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rough idle 2012 sierra 5.3

Postby browneye44 [OP] » Jul 22 2012, 12:02pm

Just bought a new sierra 1500 after a couple of days noticed ebb idling rough especially I'm cold start 3 visits to service dept calls to customer datsatisfaction just being jerked around anyone experiencing this or have any advice
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Related Topics  Rough Idle   Rough Idle   Rough Idle   Rough Idle   Rough Idle   Rough Idle   Rough Engine Idle   Rough idle when cold   Rough Idle/Starting Issues   Rough Idle/Engine Shakes   2011 silverado rough idle   Changed plugs now a very rough idle   Rough Idle - first cold morning in Kansas   99 Silverado C2500 rough idle (Classic style) 
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Re: rough idle 2012 sierra 5.3

Postby VORTEC429VORTEC429 is online! » Jul 22 2012, 5:03pm

Ive had the same issue...Mine does it from time to time. Im told by 2 different dealers "its normal with afm" "thats just how these trucks are, doin all they can even at idle to save fuel" im not sure the truth in it but i guess ill find out before 5/100,000
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Re: rough idle 2012 sierra 5.3

Postby rthms20 » Jul 22 2012, 9:58pm

Thats bull. It idles running on all eight cylinders. My truck idles fine other then the slight shake that you barely feel. Thats a 5.3 thing.
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Re: rough idle 2012 sierra 5.3

Postby ASTE25ASTE25 is online! » Jul 23 2012, 5:34am

My 5.3 in my 2005 would idle rough occasionally I attributed it to lesser quality gas I may have gotten that particular fill up (same brand names gas all the time).
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Re: rough idle 2012 sierra 5.3

Postby browneye44 [OP] » Jul 23 2012, 3:08pm

Just got off the phone with a guy who strictly does dignostic work told me he was well aware of the problem since he does contract work with local dealers. Basically he said I'm screwed gm is aware of problem their solution is to hand out a service bulletin stating this is a normal condition ! Mine idled very rough on cold start evens out a bit after warm up but after spending that kind of money....time to get a lawyer sorry I switched from Ford !!
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Re: rough idle 2012 sierra 5.3

Postby tcarr25 » Jul 23 2012, 3:15pm

I hate to hear that man. I know my 04 6.0 I had and my 11 5.3 would get a little rough if they idled for an extended period but it was just a few seconds and then they even back out.
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Re: rough idle 2012 sierra 5.3

Postby FastXRF » Jul 23 2012, 5:11pm

I notice my '12 has a bit of a rough idle when I first start it from cold, but it seems to me all it is, is the computer trying to get the engine down to the base idle as fast as possible (likely an emissions thing). I can watch the tach drop then bounce back up again because the engine was too cold to idle so low, and the computer will try again gradually for a couple minutes until the engine warms up enough to stay at the low idle.
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Re: rough idle 2012 sierra 5.3

Postby ASTE25ASTE25 is online! » Jul 23 2012, 5:44pm

I felt mine do it at times, but not always. I knew it was normal so I didn't let it bother me. It really is not hurting anything.
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Re: rough idle 2012 sierra 5.3

Postby 11 Silverado » Jul 23 2012, 6:03pm

The only thing that I noticed on my 2011 Silverado 5.3 was a little rough idle when in gear and stopped at a red light etc. It only did it occasionally, and was just barely noticable. It never has idled rough when in park or neutral. Since I got the Intune, it seems to have helped a lot and I really don't notice it anymore. But maybe I have just gotten used to it. The engine should not run as rough as you are stating. I would be upset too.
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