Jump to content

2021 Silverado 6.2 rough idle ?

Rcfire
 Share

Recommended Posts

Rcfire Enthusiast

Rcfire

Posted
Posted (edited)

So new here and have a question.  I have a 2021 Silverado with the 6.2.  It runs great but at idle at stop lights etc it has a rough idle almost like a misfire.  I have the afm turned off and it is not equipped with the auto start stop.  I have taken it in to the dealer and the dealer says can not duplicate but it’s very obvious.  I only run 93 octane fuel.  Truck has 4000 miles.  Is this a sign of a lifter failure coming in the future ?  Do these trucks  just idle like this ?  Any help ? 

Edited by Rcfire
  • Replies 31
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

Popular Posts

JAEDEE
JAEDEE

Bought my truck brand new with 5 miles on it.  I mentioned it to the dealer when I test drove it.  He told me they "all do it".  26k miles later and it stills does it, but I'm not worried about it bec

Z45
Z45

2021 Sierra Denali 6.2L and it idles so smooth you can't tell its running.  10,000 trouble free miles since 12/07/20....   I been adding a bottle of this every tank full for the better of th

Rcfire
Rcfire

Yes I only run 93 

Posted Images

Robby James Enthusiast

Robby James

Posted
Posted

Mine idles like that, I am just getting the high pressure fuel pump replaced under warranty and am hoping this resolves the issue, but I doubt it.

Rcfire Enthusiast

Rcfire

Posted
  • Author
Posted (edited)

Keep me posted.  How did you get them to at least do that.  When I took mine in they act like they can’t feel it 

Edited by Rcfire
GETGONE Enthusiast

GETGONE

Posted
Posted

The 6.2 has DFM, not AFM. How do you have it disabled? I'm guessing it's a post May build since you say it doesn't have auto stop/start.

Robby James Enthusiast

Robby James

Posted
Posted
On 10/2/2021 at 9:04 PM, Rcfire said:

Keep me posted.  How did you get them to at least do that.  When I took mine in they act like they can’t feel it 

Puddle of petrol pics on garage floor...lol

Of course they could not replicate leak on rack so I had to mention wife and son having headaches from the gas smell and that theybetter find something to fix.

Praying this was the culprit, post is below yours.

Mudcon Enthusiast

Mudcon

Posted
Posted

It is normal for the 5.3 and the 6.2.  They all have the rough idle you feel at stops.

Z45 Senior Enthusiast

Z45

Posted
Posted

2021 Sierra Denali 6.2L and it idles so smooth you can't tell its running.  10,000 trouble free miles since 12/07/20....

 

I been adding a bottle of this every tank full for the better of the 10,000 miles.  My nephew took one of mine and added to his wife's Cadillac SRX (75,000 miles) and it starting running smoother overnight to the point he bought a couple cases and adds it to every tank in the SRX and his Ecoboost Edge.

 

UCLCN_300px.gif

  • Like 1
Robby James Enthusiast

Robby James

Posted
Posted

Mine is at idle when  in gear, feels like a distinct miss been that way since new.

13k on it now.

Rcfire Enthusiast

Rcfire

Posted
  • Author
Posted
10 hours ago, GETGONE said:

The 6.2 has DFM, not AFM. How do you have it disabled? I'm guessing it's a post May build since you say it doesn't have auto stop/start.

Yes I am sorry 

 

10 hours ago, GETGONE said:

The 6.2 has DFM, not AFM. How do you have it disabled? I'm guessing it's a post May build since you say it doesn't have auto stop/start.

Yes DFM I am sorry. I have it disabled with the pulsar 

Rcfire Enthusiast

Rcfire

Posted
  • Author
Posted (edited)
11 hours ago, GETGONE said:

The 6.2 has DFM, not AFM. How do you have it disabled? I'm guessing it's a post May build since you say it doesn't have auto stop/start.

Yes I am sorry DFM.  I have it turned off with the pulsar 

 

11 hours ago, GETGONE said:

The 6.2 has DFM, not AFM. How do you have it disabled? I'm guessing it's a post May build since you say it doesn't have auto stop/start.

Yes DFM I am sorry. I have it disabled with the pulsar 

Edited by Rcfire
Rcfire Enthusiast

Rcfire

Posted
  • Author
Posted
1 hour ago, Black02Silverado said:

Mine is a smooth idle. 

 

Not starting anything but do you run 93 octane?

Yes I only run 93 

  • Like 1
Rcfire Enthusiast

Rcfire

Posted
  • Author
Posted
1 hour ago, elcamino said:

2021 Sierra Denali 6.2L and it idles so smooth you can't tell its running.  10,000 trouble free miles since 12/07/20....

 

I been adding a bottle of this every tank full for the better of the 10,000 miles.  My nephew took one of mine and added to his wife's Cadillac SRX (75,000 miles) and it starting running smoother overnight to the point he bought a couple cases and adds it to every tank in the SRX and his Ecoboost Edge.

 

UCLCN_300px.gif

Thank you I will try that 

Rcfire Enthusiast

Rcfire

Posted
  • Author
Posted
1 hour ago, Robby James said:

Mine is at idle when  in gear, feels like a distinct miss been that way since new.

13k on it now.

That is exactly how mine is.  Have you ever had it in the shop for them to look at that ?  I just hate dealing with the dealerships but dang it’s drives me nuts when it does that.  I feel like a brand new truck should idle smooth 

Black02Silverado Senior Enthusiast

Black02Silverado

Posted
Posted
7 minutes ago, Rcfire said:

Thank you I will try that 

I run it as well in my Silverado and wifes Suburban.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.3k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,724
    Total Members
    8,960
    Most Online
    No1UKnow
    Newest Member
    No1UKnow
    Joined

  • Who's Online   6 Members, 1 Anonymous, 1,094 Guests (See full list)

  • Latest Articles

  • Posts

    • Chuck FB
      OCI, not when but why?

      By Chuck FB · Posted

      I certainly could be wrong but I hear of pickups far newer than that 2007 cutoff which may not be going to the wrecker but are having engine work done and be that a reman engine or new engine or trying to repair the existing engine. Some of it would be design issues as per the cylinder deactivation system that GM has and one of those lifters wiping out the cam and the question of oil changes moving the needle or not on that whole mess, or in the case of Ford pickup engines that have the long timing chains and wearing them out and the roller followers and phasers and some of that certainly goes back to oil change intervals. But in those various cases the truck has all sorts of life left in it and so the unfortunate owner and may be original owner or used market owner that is pouring money into repairs so the truck is not seeing the salvage yard yet but damage is happening by infrequent oil changes. A friends son had bought a 2018 I think it is half ton GM and it had some sort of extended or used dealer warranty on it and of course the lifter issue bites and its rattling and so the dealer had to swallow the bill and was at least 7000.00 and I think they only replaced what they felt they had to replace so yeah, I can see that being a ticking time bomb in the not too distant future. Would frequent oil changes cure all these engineering "marvels", probably not but some engine designs have shown that they do much better if the oil is changed a lot more often then if the manufacturer service claims are followed. New trucks cost so much that there is an incentive to keep the existing truck on the road by repairing. 
    • davester
      Tranmission stays in Low

      By davester · Posted

      get a good code reader, and find out what problems the truck has noticed by reading codes. cheap ones can only get basic engine codes, you may want to get one that can get codes from all the computers in your truck.
    • asilverblazer
      OCI, not when but why?

      By asilverblazer · Posted

      This is sort of my point, salvage yards aren't overflowing with all these 'poorly' maintained trucks - excellent/good/servicable condition otherwise, salvaged only as a result of a bad engine from poor oil change regiment.    In my area, there are no 2007 to newer gm trucks/suvs in any salvage yards. A few are in the 'recyclers' with very obvious reasons for being there - wrecked.
    • asilverblazer
      Stabilitrak conversion to Z71

      By asilverblazer · Posted

      Stabilitrack was a stability control, traction control system, that functioned independently from the transfer case.   Z-71 has nothing to do with the transfer case or differential.   If it does have an AWD system, my memory recalls this being specific to the Denali trim, converting won't be as simple as swapping out mechanical parts like differentials and transfer cases. It will require reprogramming at a minimum. Long story short, not likely worth it.   Pulling a fuse, may disable the AWD system, it might also prevent any other transfer case functions.   However, the AWD case was generally based on the same transfer case you refer to in the 2006 Suburban. If it still has a 4-High and 4-Low where the transfer case locks and splits power 50-50 front to rear, what are you gaining by changing anything? A true-rear wheel drive only, what good will that serve? Not enough to go through the trouble of changing out all the parts.    Generally, all the factory systems will handle a 33" tire and re-gearing. Probably a 35" tire too, if you aren't driving like a caveman. If 35" tires are in the plan...   If you do plan on driving like a caveman or are fully committed to 35" tires, an entire re-think of the build is probably in order. Starting with square one, an IFS front end isn't going to be the best starting point for 35's and caveman driving. 
    • PunchT37
      Oil Consumption

      By PunchT37 · Posted

      1/2 qt over full ain`t gonna hurt $h!t. Most times, a whole qt won`t either. Most have windage trays now. As long as the crank isn`t slapping itself in the oil, it`s not the end of the world.   We used to overfill 1 qt at the track, at race time. Better to have it over full than having the pan sucked dry at 6500 rpm`s.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...