Odd hesitation/miss fire during acceleration

[miles5241]

Hello Everyone!

 

First off I have a 2015 Silverado 5.3 4wd. So when I first brought the truck home after about 50 miles I developed a misfire. I brought it in and they found a bad spark plug and bad coil. This has been great until about 2k miles later and I started to develop what I thought was it cutting throttle after it shifts, shifts drops into 1700 RPM range stutters then and gives a misfire type feel. Bring it in and told it was the torque management system doing what its supposed to. I accepted this and kept driving it.

 

After this last weekend I had the opportunity to drive it 200+ miles at speeds of 70-75 mph and what I noticed that the same hesitation/misfire would occur if I give it a certain amount of gas at that speed. At this speed the RPMs were right in that 1700 RPM range that I was noticing the "Misfire" after a shift. Well after coming back down to speed it would consistently happen happen while accelerating from a dead stop at a "normal" pace. This was after running the ruck for 2 hours on the highway. No CEL. So I take it back to the dealer to get some service done and have them to explore this again...The answer I get was they could not replicate the issue and the only thing they think it may have been is the transition between 8/4 cylinders and since I don't have exhaust flap I may be noticing it more, I have an aftermarket exhaust. This was after 2 days and the shop foremen driving it home for the night and back the next morning. Which my response was the truck was in here prior to the exhaust and know what the transition feels like, and what is occurring is disruptive and can be felt by everyone in the vehicle. Of course at this point there isn't anything they can do since they can't replicate it and there is no code. They want me to drive with a tech to see if its my driving style. I had 2 others drive it and it happened to them too...

 

So not sure what to do or what it can be...everything points back to ignition/fuel in my mind since it had issues from the factory.

 

 

What you guys think?

[WendysOrBust]

These new direct injection engines do not respond well to 87 or cheap gas. Try running some good quality 93/91 or e85.

[miles5241]

These new direct injection engines do not respond well to 87 or cheap gas. Try running some good quality 93/91 or e85.

 

I've been running 93 the past few tanks, thinking that was perhaps what it was, issues still continue. I want to bring it to the dealer and have them ride with me for a solid 20-30 minutes, since it seems to happen more when the weather is warm and the truck has been warm for sometime. The past few mornings have been cool and the issues seems to have gone away until it warms up in the afternoons.

[Kerrslight]

Did you ever figure out a solution to this? I feel like I'm experiencing a similar issue. While I am accelerating every now and then the truck feels like it "plateaus" then gets back on it

[GMC207]

My 2015 is doing the exact same thing. I haven't noticed it once I'm up to speed, but from a stop it does it almost every time once the truck is warmed up. It like studders in the intersection. The passenger can even feel it.

[Maxmayo]

My 2015 is the same! The dealership has tested the gas, cylinder compression, electrical systems, replaced the tourqe converter, polished transmission rods snd finally replaced the transmission. The problem still exists! I have driven 3 different loaner trucks and they drive fine.

 

Has anyone found a solution to this issue?

[joeisalsocool]

I can confirm that using 89 instead of 87 removed all hesitation, plateaus, and studders.

I ran 89 for 2 tanks earlier this year to test, then switched back to 87 (same gas station for all).

Difference is night and day. Most of my commute is city, and I could tell right away that there was substantially less power, specifically during shift changes.

Do yourself a favor and start drinking 89. Your truck will thank you in the long run.

I opted against 93 only because of price. An extra $15/tank isn't worth the hassle.

[Devildog82]

I have a 2015 Silverado that does the same thing. It sputters and tugs when it shifts in to 2nd or 3rd gear.. This is extremely annoying and embarrassing for it is noticeable by passengers. I have taken this truck to the dealership and they always tell me that they dont have a code to go after and that the truck is fine.. I have owned many vehicles and non have done this crap and i almost find it insulting when they tell me that everything is ok.. Has anyone found a solution to this problem?? My next step is to switch to higher octane gas and maybe change to a better spark plug and cables.. I am giving myself. little bit of time to try and fix this, for if I cant I will probably sell it or trade it in for something else.. This problem is making me crazy for its annoying and its everything but an enjoyable ride... Any advice is appreciated..

[lloydsmale]

there is a service bulletin and a computer reprogram that takes care of this. At least in the case of the 17s. Mine did the same and after reprograming it went away. It is your torque converter lockup kicking in and out.

[Gofas]

Damn another issue to complain about.  Just as I said my truck is running great I expierence this engine miss when getting on freeways and accelerating from stops.

[jason7]

hi there, ive got a 2016 siverado with 24000 miles on it now, its the same way. stumbles in 2-3 shift, acts like it dont know what gear it wants. i bought me a tuner, corrected the problem for the most part, but if you slow down and then try to get back in it , better hope nobodys coming. i will say the tuner has alot of options, the best one is that you can disable the AFM, so that your running 8 cylinders all the time. ive got 94 gmc with the true throttle body, it blows anything away they got coming out theses days. Drive by wire is crap. my advice is if your in the market for GM trucks, 3/4 ton is the way to go,you get the bigger motor and dont have the 4/8 cylinders flex fuel crap...DURAMAX,,, YEP, YEP , CRAZYMONEY THOUGH,

[Cwjames]

A little late joining in, but I purchased a 2017 sierra 1500 in June of this year.  Amazing truck!  It took a week or two to really tune into an issue similar to all of yours.  The morning drive to work was great, and generally the evening drive as well.  Though the days there were lunch errands to run, I noticed this funny hesitation, it drove like my old '89 on a rainy day!  Tuning into this, I pushed the issue and would unnecessarily drive the truck at random times. (This is summertime in northern Michigan temps).  I had pinned it down to any startup 3-7 hrs after a full temp drive.  Any sooner, all was fine, any later, no issue.  Once fully warmed up, I have no issue.  It's an odd, partially cooled engine issue, only happening at low rpm.  Slow acceleration through the parking lot and onto the road.  I could push through it by stomping on the accelerator, but it just makes for nonsense, uncomfortable accelerations.  I have watched the dash for the v4-v8 shift, there is no correlation.  Never happens at speed, like on the highway in some reports.  I also tow boats and campers with no issues once warm.

 

I took it it to the dealer, they could not reproduce, of course, and did a system update in hopes of fixing the problem, claiming the transmission needed to learn my driving habits.  No fix!

 

Back two more times, they claim it's an emissions regulation that I cannot get around, and the Colorado's are worse.  Bunch of BS.  Supper happy with the truck in all other aspects, but this is annoying!

 

I have parked the truck for the winter, don't want the tons of salt dumped on our winter roads to eat the body up, so nothing to report on cold weather conditions.

 

Just plain frustrating!

[DustyC]

I have seen similar issues on my 17 with under 2k miles. 

 

[Paintor]

Can you disable Stabyltrak and see if that corrects your problem? Computer may be causing your problem with Stabyltrak....causing your motor to cut out...possibly shifting errors as well..slipping your 6L80 trans.....could be from a bad sensor...ground...software...

 

If that fixes your problem...only keep it on in bad weather.

Edited November 21, 2017 by Paintor

[billybob denali]

Dealer told me that my 2017 Denali 1500 with new 8 sp tranny, its the tranny and GM has no answer to this problem. I did not have this issue with my 2015 1500 Denali(6 sp)

was told to drop down a gear or push in button for hauling a trailer and the mis-fire /hesitation will disappear .. well, I'm not going to burn more gas using the towing

feature, GM just needs to come up with a fix... $60+K truck and it shutters....