2017 5.3L/8 speed lugging at throttle tip in

[SGS_Z71]

Drove around more today, and it is definitely better.  It is smoother, seems all around to run better.  Will see if it deteriorates on my trip next week.  But in the mean time, I’d be asking your dealers to take a look at fuel pressure drop test and show you the results.  Will report back next week after I’ve made my trip.   

[Mattiboy62]

My 2018 5.3 8spd does all of the aforementioned things that you guys have described, hard shifts, chugging, etc etc. I don’t have time to run back and forth to the dealer for nothing but excuses why it shifts like garbage. I’m gonna roll the dice with my warranty and get a tune from black bear. Can’t be healthy for any of the driveline components to be running like this. Love my truck otherwise. Very upsetting to void my warranty to make the truck run as it should when I’ve already got 53k+ invested in the purchase. Would have stuck with another Toyota Tundra if I knew I was going to have to deal with this trash. 

[SGS_Z71]

8 hours ago, Mattiboy62 said:

My 2018 5.3 8spd does all of the aforementioned things that you guys have described, hard shifts, chugging, etc etc. I don’t have time to run back and forth to the dealer for nothing but excuses why it shifts like garbage. I’m gonna roll the dice with my warranty and get a tune from black bear. Can’t be healthy for any of the driveline components to be running like this. Love my truck otherwise. Very upsetting to void my warranty to make the truck run as it should when I’ve already got 53k+ invested in the purchase. Would have stuck with another Toyota Tundra if I knew I was going to have to deal with this trash. 

Do us a favor and report back on how it goes.  Would like to see more feedback of trucks after the blackbear tune.  

[Mattiboy62]

On 2/24/2018 at 1:47 AM, SGS_Z71 said:

Do us a favor and report back on how it goes.  Would like to see more feedback of trucks after the blackbear tune.  

 

 

So this is the answer I got from Black-Bear... apparently most 2017 and all 2018 owners (Me) are Screwed cause GM has now locked the programming on most 2017’s and all 2018’s equipped with 8-spd tranny. All they can offer is the auto tune which is a engine tune only which supposedly gives better throttle response HP/TQ numbers but that’s not what I was looking for.  GM should be ashamed that a aftermarket product can make their own vehicle run better than theirs... rather than fix the problem they lock it. Now I dont know What to do. Honestly I feel it’s mostly A Transmission tuning issue... I’m not looking for HP/TQ gains I’m happy with what the truck came with as far as the #’s. I guess It’s back to the dealer. To see what they can do. IMO it’s not worth voiding my warranty unless i can tune the tranny. 

[SGS_Z71]

37 minutes ago, Mattiboy62 said:

 

 

So this is the answer I got from Black-Bear... apparently most 2017 and all 2018 owners (Me) are Screwed cause GM has now locked the programming on most 2017’s and all 2018’s equipped with 8-spd tranny. All they can offer is the auto tune which is a engine tune only which supposedly gives better throttle response HP/TQ numbers but that’s not what I was looking for.  GM should be ashamed that a aftermarket product can make their own vehicle run better than theirs... rather than fix the problem they lock it. Now I dont know What to do. Honestly I feel it’s mostly A Transmission tuning issue... I’m not looking for HP/TQ gains I’m happy with what the truck came with as far as the #’s. I guess It’s back to the dealer. To see what they can do. IMO it’s not worth voiding my warranty unless i can tune the tranny. 

Check with HP tuners, I think the TCM can be sent off and unlocked.  I remember reading about it and someone commented on the same question in one of the posts in this thread when I asked about it.

[FourThor]

 
 
So this is the answer I got from Black-Bear... apparently most 2017 and all 2018 owners (Me) are Screwed cause GM has now locked the programming on most 2017’s and all 2018’s equipped with 8-spd tranny. All they can offer is the auto tune which is a engine tune only which supposedly gives better throttle response HP/TQ numbers but that’s not what I was looking for.  GM should be ashamed that a aftermarket product can make their own vehicle run better than theirs... rather than fix the problem they lock it. Now I dont know What to do. Honestly I feel it’s mostly A Transmission tuning issue... I’m not looking for HP/TQ gains I’m happy with what the truck came with as far as the #’s. I guess It’s back to the dealer. To see what they can do. IMO it’s not worth voiding my warranty unless i can tune the tranny. 

Is this also the case for the 6 speed? I’m gonna be pretty damn annoyed if that’s the case. I feel for you man, I also have the 2018 and am just flabbergasted at the issues it has so far.


Sent from my iPhone using Tapatalk

[SILVER SLED]

The 17-18 8speeds can be tuned in the vehicle without having to remove the tcm and send it in.  Unfortunately I don't know of any hand held tuners that can tune them, only a tuning shop. 

[Mattiboy62]

. He said specifically the 8spd so you might still be in luck 

[SGS_Z71]

Update:

 

Just drove over 500 miles with all different types of driving, and I think they have fixed it!  I feel an occasional shudder but did in my last two loaners, so I would say that is “normal”.  So as of today, I am leaning towards calling this closed.  I strongly suggest you guys with issues to ask them to test the fuel pressure drop.  I was 100% convinced I was feeling a transmission or torque converter issue, but was proven wrong.  May be keeping her after all!

[13891]

2 hours ago, SGS_Z71 said:

Update:

 

Just drove over 500 miles with all different types of driving, and I think they have fixed it!  I feel an occasional shudder but did in my last two loaners, so I would say that is “normal”.  So as of today, I am leaning towards calling this closed.  I strongly suggest you guys with issues to ask them to test the fuel pressure drop.  I was 100% convinced I was feeling a transmission or torque converter issue, but was proven wrong.  May be keeping her after all!

That is good to hear.  Can you tell approximately what the ambient temperature is where you are now?  I ask because temps are over 40F here today and the symptoms are all but completely eliminated on my truck.  This is something I noticed early on in this mess.  The colder the ambient temperature is, the worse the symptoms were.  This is likely why I didn’t notice it when I initially purchased it.  It was the last week of August and of course temperatures were very warm.  We experienced warm temps right up through early/ mid November.  I suspect later this week when the cold returns so will the symptoms.  I would be curious to know if you experience similar results.  Keep us updated.

[SGS_Z71]

2 minutes ago, 13891 said:

That is good to hear.  Can you tell approximately what the ambient temperature is where you are now?  I ask because temps are over 40F here today and the symptoms are all but completely eliminated on my truck.  This is something I noticed early on in this mess.  The colder the ambient temperature is, the worse the symptoms were.  This is likely why I didn’t notice it when I initially purchased it.  It was the last week of August and of course temperatures were very warm.  We experienced warm temps right up through early/ mid November.  I suspect later this week when the cold returns so will the symptoms.  I would be curious to know if you experience similar results.  Keep us updated.

I drove in 35-38 degrees today through Michigan into northern Wisconsin.  I bought my truck in late August too.  Hmmmm.  Mine did it really bad in the 40’s down in Tennessee though before this repair, I had serious concern it wasn’t going to make it back to Michigan.  I have some more travel coming up, hopefully it will be cold so I can try testing it.  One could think that yours could be a fuel issue?... more fuel is needed in the cold.  If you can’t get enough fuel....?  Would be curious to see what the results are.  Biggest thing that helped me was being able to duplicate it for the tech.  He described it as trying to drive with a balloon behind the gas pedal to simulate tipping into the throttle.

[13891]

2 minutes ago, SGS_Z71 said:

I drove in 35-38 degrees today through Michigan into northern Wisconsin.  I bought my truck in late August too.  Hmmmm.  Mine did it really bad in the 40’s down in Tennessee though before this repair, I had serious concern it wasn’t going to make it back to Michigan.  I have some more travel coming up, hopefully it will be cold so I can try testing it.  One could think that yours could be a fuel issue?... more fuel is needed in the cold.  If you can’t get enough fuel....?  Would be curious to see what the results are.  Biggest thing that helped me was being able to duplicate it for the tech.  He described it as trying to drive with a balloon behind the gas pedal to simulate tipping into the throttle.

I kind of always felt like it may be a fueling issue but it’s always my word against theirs so it never went anywhere.  I am going to use your info to talk with the dealer tomorrow and kind of feel them out.  Hopefully they will bite on this and run with it.  If and when they do I will post the results of the testing on here for you to see.  Thanks again!

[13891]

15 hours ago, SGS_Z71 said:

I drove in 35-38 degrees today through Michigan into northern Wisconsin.  I bought my truck in late August too.  Hmmmm.  Mine did it really bad in the 40’s down in Tennessee though before this repair, I had serious concern it wasn’t going to make it back to Michigan.  I have some more travel coming up, hopefully it will be cold so I can try testing it.  One could think that yours could be a fuel issue?... more fuel is needed in the cold.  If you can’t get enough fuel....?  Would be curious to see what the results are.  Biggest thing that helped me was being able to duplicate it for the tech.  He described it as trying to drive with a balloon behind the gas pedal to simulate tipping into the throttle.

Discussed with my dealer today.  They had a couple of questions about your experience.
1 - How many miles on it when it started exhibiting the problem (approx.)
2 - Current mileage (approx.)
3 - Your vehicle has never set any codes correct through the whole ordeal correct?

4 - They wanted to know the dealer you were working with.  If you don't want to provide name could you provide town or city?

They did not perform injector balance test.  Once GM told them to stop working on it they were scared to perform any other diagnostics.

[SGS_Z71]

59 minutes ago, 13891 said:

Discussed with my dealer today.  They had a couple of questions about your experience.
1 - How many miles on it when it started exhibiting the problem (approx.)
2 - Current mileage (approx.)
3 - Your vehicle has never set any codes correct through the whole ordeal correct?

4 - They wanted to know the dealer you were working with.  If you don't want to provide name could you provide town or city?

They did not perform injector balance test.  Once GM told them to stop working on it they were scared to perform any other diagnostics.

1 - 5000 miles

2 - 13000 miles

3 - Zero codes, no CEL, etc

4 - Livonia, MI

[13891]

Thanks for the info.  Not sure if they will do anything yet.