Jump to content

2017 5.3L/8 speed lugging at throttle tip in

SGS_Z71

By SGS_Z71
in Troubleshooting & Recalls

Recommended Posts

SGS_Z71 Enthusiast

SGS_Z71

Posted
  • Author
Posted

So on mine today, if I brake torque it while driving down the road it will chuggle all the time.  This is the first time I’ve been able to recreate it like that.  Any thoughts?  That tells me a torque converter problem..

 

I spoke with the service manager today and the truck is going back in when I get home from Tennessee.  They are going to open a case with GM.

  • Replies 147
  • Created
  • Last Reply
sonerick Enthusiast

sonerick

Posted
Posted
20 hours ago, FourThor said:

Is the consensus really that this is software? Anyone here able to tune this issue out of their truck? Rather than take my 18 into the dealer yet again to be told that this issue is common and GM is waiting to make a statement I'd rather just get it fixed myself if a tune works.

This thread has the answer you are looking for:

 

SGS_Z71 Enthusiast

SGS_Z71

Posted
  • Author
Posted

Well, here we go again.  Dropped the truck off at the dealer this morning.   I’m going to bet they throw a torque converter at it.

SGS_Z71 Enthusiast

SGS_Z71

Posted
  • Author
Posted

Update - got an email from the service manager after 5 days that they haven’t been able to duplicate yet, and based on the data sent to GM that everything was in spec and no repairs should be attempted.  They wanted me to come in to drive.  I went up and took the trans tech for a ride and it did it within the first two minutes, and kept doing it.  We swapped seats and it did it for him, just the same.  I could tell he was embarrassed, so I let the inconvenience slide.  I also told him that I haven’t filed a complaint with GM yet as I know it dings them, he appreciated that.

 

So... more waiting, but off the record he said I think you’re right, it’s a torque converter.  

 

Service manager is getting annoyed with me and my documenting conversations back on email, so I must be doing something right.

 

Stay tuned!

SGS_Z71 Enthusiast

SGS_Z71

Posted
  • Author
Posted

Update #2 for today:

 

The service manager contacted me and said he went for a ride with the tech and he asked him to check the fuel injectors as it reminded him of when one went bad in his truck.  They ran a balance test and didn’t like what they saw so they ordered all new injectors.  See attached balance table.

 

No codes/CEL, etc.

 

I will report back on this once I have the truck back or more info.  Hopefully this is a smoking gun and can help others.

 

 

D017AA1D-E389-437D-9AC7-0D6B852C9FBC.jpeg

SGS_Z71 Enthusiast

SGS_Z71

Posted
  • Author
Posted
9 hours ago, Tahoe02 said:

If that doesn't work I think I would insist on the torque converter replacement. Standing by to read your next up date.

Agree 100%.

 

It makes sense.  This same tech in November told me to try to tanks of premium to see if it made a difference.  He might have been onto something then.  

AaronIROCZ Enthusiast

AaronIROCZ

Posted
Posted
On ‎2‎/‎6‎/‎2018 at 4:24 PM, FourThor said:

Is the consensus really that this is software? Anyone here able to tune this issue out of their truck? Rather than take my 18 into the dealer yet again to be told that this issue is common and GM is waiting to make a statement I'd rather just get it fixed myself if a tune works.

In my case yes it is definitely software. My 2016 6.2 8-speed had harsh shifting, for example when you slow down for the person in front of you to turn off the road onto a side street and you slow to about 10-15 mph and accelerate once they make the turn you get a rather bad harsh shift that resembles being lightly rear ended. I took it to the dealer in Feb of 2017 and they updated the transmission software along with the engine software, this helped with the harsh shifting. However I now feel the chugging and hesitation with throttle tip in at a stop sign or stop light almost all of the time now. It NEVER did this at all prior to the software update. It is going in tomorrow for this issue as well as the truck at times does not move in reverse at first start up at times, it acts like it is in neutral I rev it up and nothing, other times it bangs into gear that results in me squealing the tires while backing out of my garage. SO I will update if I get anything different done to my truck or if they fix it, which from your responses I highly doubt anything will help.

SGS_Z71 Enthusiast

SGS_Z71

Posted
  • Author
Posted

For what it’s worth, I have had the delayed engagement in reverse and also delayed acceleration at times.  Pulling out into traffic sometimes can be interesting.  I hoped to tune that crap out someday.  For now, I need to figure out my hestitation/chugging issue.

BamCam Enthusiast

BamCam

Posted
Posted
On 2/16/2018 at 9:33 PM, SGS_Z71 said:

Update #2 for today:

 

The service manager contacted me and said he went for a ride with the tech and he asked him to check the fuel injectors as it reminded him of when one went bad in his truck.  They ran a balance test and didn’t like what they saw so they ordered all new injectors.  See attached balance table.

 

No codes/CEL, etc.

 

I will report back on this once I have the truck back or more info.  Hopefully this is a smoking gun and can help others.

 

 

D017AA1D-E389-437D-9AC7-0D6B852C9FBC.jpeg

Your story is sounding more and more like my brother's and you are going down the same rabbit hole.  They too were suspecting injectors and were going to replace all but later called and said they were not.  Did GM put a stop to that for some reason?...not going to cover under warranty?...we don't know.  At that point is when GM field guys pull data from truck and left never to be heard from again and to date still no direction to dealer for ""fix".  That is why lemon law was initiated.  I hope you have better luck and wish you the best.

SGS_Z71 Enthusiast

SGS_Z71

Posted
  • Author
Posted
9 minutes ago, BamCam said:

Your story is sounding more and more like my brother's and you are going down the same rabbit hole.  They too were suspecting injectors and were going to replace all but later called and said they were not.  Did GM put a stop to that for some reason?...not going to cover under warranty?...we don't know.  At that point is when GM field guys pull data from truck and left never to be heard from again and to date still no direction to dealer for ""fix".  That is why lemon law was initiated.  I hope you have better luck and wish you the best.

 

We shall find out.  That was what transpired late on Friday.  I sure hope mine doesn’t head the same way as your brother’s.  I honestly don’t want to get rid of it, but I won’t accept performance as is.  I’d be ok if I got all my money back I guess.

SGS_Z71 Enthusiast

SGS_Z71

Posted
  • Author
Posted

Update:

 

Got it back today and it seems to be a lot better, if not fixed. I still feel an occasional shudder, but I did in the last two loaners I had.  I will be making a 1000 mile trip next week, which will be the real test.  Here is the data from my work order:

DC950A06-2780-4705-81D7-23DA535CF289.jpeg

13891 Enthusiast

13891

Posted
Posted
3 hours ago, SGS_Z71 said:

Update:

 

Got it back today and it seems to be a lot better, if not fixed. I still feel an occasional shudder, but I did in the last two loaners I had.  I will be making a 1000 mile trip next week, which will be the real test.  Here is the data from my work order:

DC950A06-2780-4705-81D7-23DA535CF289.jpeg

I hope this takes care of it.  Keep us in the loop.  I will use this to go back to the dealer if it corrects it.

SGS_Z71 Enthusiast

SGS_Z71

Posted
  • Author
Posted
9 minutes ago, 13891 said:

I hope this takes care of it.  Keep us in the loop.  I will use this to go back to the dealer if it corrects it.

Me too.  It was the smoothest drive I’ve had in a long time, I can say that.  I just have doubts that they fixed the root cause versus just a symptom of it.  I find it hard to believe I had that many bad injectors.  Also, don’t know if anyone noticed, but the low/high pressure drops are tied to each side of the engine 1-3-5-7 and 2-4-6-8.... curious right?

13891 Enthusiast

13891

Posted
Posted
1 hour ago, SGS_Z71 said:

Me too.  It was the smoothest drive I’ve had in a long time, I can say that.  I just have doubts that they fixed the root cause versus just a symptom of it.  I find it hard to believe I had that many bad injectors.  Also, don’t know if anyone noticed, but the low/high pressure drops are tied to each side of the engine 1-3-5-7 and 2-4-6-8.... curious right?

That is interesting.  I wonder what spec or allowable is?  Unfortunately in this time of “value improved” components it would not surprise me if there is a bad batch of injectors floating around and they have either not identified them or enough people have not made enough noise.

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.5k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,903
    Total Members
    8,960
    Most Online
    RyGuy43
    Newest Member
    RyGuy43
    Joined

  • Who's Online   5 Members, 0 Anonymous, 463 Guests (See full list)

  • Latest Articles

  • Posts

    • AlVeron
      Manufactuer's Defect - Paint Failure - Cherry Red High Country 2021 Suburban

      By AlVeron · Posted

      This is NOT impact damage nor neglect. There were previous class action lawsuits because of such paint preparation st GM manufacturing plant. Not just the Cherry Red Color. This paint is applied in three processes to obtain the desired color.  The manufacturer will cover for 36 months or 36k miles only. That rust is actually corrosion because of the paint process failure. Corrosion is covered for 100,100 miles or a certain months. However their corrosion doesn't include this type. Go figure. Clearly manufacturer knew from previous paint issues. This started 3 weeks ago out of the blue.  
    • richard wysong
      Wow I'm in a pickle. (Broke down truck) and a story.

      By richard wysong · Posted

      Is it time to put a piece of tape over the CEL? 
    • davester
      2015 Silverado 3500 right rear turn indicator failure

      By davester · Posted

      consider doing electrical testing?  I would guess some power or ground wire/connection has a problem.   alldata.com has wiring diagrams, connector pinouts and diagnostic procedures you can use to find where the problem is.
    • davester
      My First Project and GMC has me stumped

      By davester · Posted

      can you tell if the reader is actually trying to get codes, and the pcm is reporting none, or is your reader just silently failing because it's not communicating with the pcm?
    • Atlas
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Atlas · Posted

      Any joy with this truck seems to be short-lived.   The CEL for P0172 ("bank 1" too rich) is now "intermittent".   I'm not sure where to check, or re-check, and my energy to keep chasing problems with junk is wearing thin. The P0172 seems to set as I'm coming to a stop, completely off the throttle, when fully warm. At least, that's what it's done the 3? times it's set.   Everything appears normal on the scanner EXCEPT long term fuel trim. There's only one bank on this vehicle because it's an OBD 1.5 with only one upstream O2 sensor. At idle, it's around -16.4% and will dip to -18% occasionally at idle or off-throttle. LTFT approaches 0 when throttle is held at 2500rpm. Short term appears normal, much closer to zero all the time. The LTFT tells me the engine is running rich at idle but compensating at higher load. But, why?   The EVAP purge valve doesn't appear to be leaking/sucking fuel vapor continuously. Is it sticking just as I come to a stop and the engine is choking on fuel vapor and sets the P0172? But that doesn't explain the persistently negative LTFT. Disconnecting the purge valve doesn't seem to make any difference.   I suppose that leaves another dang issue with the fuel injector. A leaking fuel pressure regulator, a new leak in the spider, or a leaking fuel injector/poppet valve I didn't see, or a small crack in one of the spider legs.   The vacuum line leading to the fuel pressure regulator doesn't have raw fuel in it. It doesn't even smell like fuel when it's pulled off, not until you suck air through it, then you can tell it leads to a fuel component. I'd consider that normal? Nothing is signaling this is a FPR issue from the outside, at least.   The oil smells like fuel but it's not building volume. I've noticed most oil in most engines smells like fuel to some degree so it's hard to say if the smell is an issue or not. Or if the engine just still smells like fuel because the crankcase was full of it a few hundred miles ago. But it's been changed twice since that original issue of the leaking fuel line dumping fuel into the intake.   Patience is running very thin. Every win seems to be accompanied by two steps backwards, or another issue that leads to removing at least the top half of the intake manifold. Enough! LOL

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...