Jump to content

2011 Sierra Surging Ahead

urbancowboy

Recommended Posts

urbancowboy Enthusiast

urbancowboy

Posted
Posted

Noticed this a few times now and now more frequently. Whenever I come to a stop the truck wants to surge ahead, like it speeds up on its own. Very dangerous to be frank especially when approaching someone at a stop light. 2011 sierra, crew cab 5.3. Anyone else notice this with their truck?

  • Replies 52
  • Created
  • Last Reply
doublejz New Member

doublejz

Posted
Posted
Noticed this a few times now and now more frequently. Whenever I come to a stop the truck wants to surge ahead, like it speeds up on its own. Very dangerous to be frank especially when approaching someone at a stop light. 2011 sierra, crew cab 5.3. Anyone else notice this with their truck?

 

My 2011 Silverado 5.3 ext. cab is doing the same thing. It's annoying as hell... as you have to be prepared for a speed up when you're trying to stop.

GasHog369 Senior Enthusiast

GasHog369

Posted
Posted

My dad tells me the same thing is happening in his '11... I thought it was just him hitting gas and brake together.. Maybe not?

jblakeney Senior Enthusiast

jblakeney

Posted
Posted

Ahhhhhhhhh, nothing like a wire in between your foot and the throttle blade..... geeeeeeeees what was so wrong with the cable????? We had cables for years and no issues.... when the broke the throttle slapped shut.

 

Just another piece of electronics that can cause problems and cost 400 bucks. I like my cable....

 

Jbo

pm26 Senior Enthusiast

pm26

Posted
Posted
Ahhhhhhhhh, nothing like a wire in between your foot and the throttle blade..... geeeeeeeees what was so wrong with the cable????? We had cables for years and no issues.... when the broke the throttle slapped shut.

 

Just another piece of electronics that can cause problems and cost 400 bucks. I like my cable....

 

Jbo

 

Yes, it sounds like it could be a faulty potentiometer at the base of the accelerator pedal.

 

I have a throttle cable in my car and it has not failed in 312,000 miles. :thumbs:

 

My truck has not given me any trouble either and I believe it has the drive-by-wire arrangement.

&CDFiXER% Enthusiast

&CDFiXER%

Posted
Posted

I've noticed mine doing this as well. I can't seem to get it to reliably repeat.

scz71864 Enthusiast

scz71864

Posted
Posted

i know what your talking about, its like when it down shifts or it goes out of AFM, it throws the car forward, it dont think its the gas petal

wavery Enthusiast

wavery

Posted
Posted
its downshifting and the torq is still locked it sounds like...

 

^ ^ what he said ^ ^

 

(maybe :thumbs: ) could be lots of things and very tough to diagnose unless they have found a common fix for it.

 

I think that I would print out this thread and take it with me to the dealer so you can show him that this may be a common but unreported issue. If the Service Adviser says, "Gee..... I've never heard of this before"... which may be true...... you can whip out these posts. Sorta odd that this issue is appearing on 2011 vehicles only.

 

Just don't take the attitude that they may be trying to hide something. You may be the 1st one to have actually taken your vehicle to this particular dealership (or any dealership, for that matter) for that issue.

davisenglish@hotmail.com Enthusiast

[email protected]

Posted
Posted

My 2011 1500, 5.3, 6 spd, crew does exactly what you guys have described. Has since it left the lot, but something to add; At most cold starts, with my foot firmly on the brake, I drop it into drive and it lurches ahead. I don't know exactly how these two issues could be related, but i suspect they are.

 

The rev issue when downshifting is manageable if you expect it, but none the less dangerous and puts unnecessary wear on brakes. I'm going to do some testing with and without tow/haul and see what i can find before i go to the dealer.

AlaskanSilverado07 Enthusiast

AlaskanSilverado07

Posted
Posted

I traded in my 2009 Silverado 1500 for a 2011 Avalanche...what a mistake. The 2009 transmission performed flawlessly and it too was the six speed...however, the 2011 is not good at all. It will be interesting to see how they do over time. Had I known how poorly the 2011 transmission has performed in the last 2500 miles since new, I would have even considered buying a different brand. I'm not impressed and have owned Chevy's since 1979!

tjm80 Enthusiast

tjm80

Posted
Posted
Noticed this a few times now and now more frequently. Whenever I come to a stop the truck wants to surge ahead, like it speeds up on its own. Very dangerous to be frank especially when approaching someone at a stop light. 2011 sierra, crew cab 5.3. Anyone else notice this with their truck?

 

I know exactly what you're talking about. Thought maybe it was something I was doing.

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

    250.4k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    342,791
    Total Members
    8,960
    Most Online
    d.lowrey
    Newest Member
    d.lowrey
    Joined

  • Who's Online   0 Members, 0 Anonymous, 3,207 Guests (See full list)

    • There are no registered users currently online

  • Latest Articles

  • Posts

    • Grumpy Bear
      J&L OIL SEPARATOR CO

      By Grumpy Bear · Posted

      Just did an injector/HPFP replacement on Pepper at 192,400 miles; close enough to 200K, RIGHT? (If 200K is considered life end and to me it isn't). But hey, to each his own.    Have never run a catch can on this vehicle. Back side of every valve looked like a new valve spray painted semigloss black. Port walls looked 'neat' (all a normal result of passive EGR via VVT) Zero build up even in AFM cylinders. Just color. It uses no measurable oil and never has.    At 155,000 I put her on E-85 and a borescope of the cylinders at plug change showed very clean pistons and valve faces. The replaced injector tips looked new. (It was the pump piston seal that was leaking). Oh well, have six good backups.    Still gets 28 mpg on gas (highway average) and over 20 (highway) on alky. UOA's look good and runs as good now as it did when I bought it. Better in fact.    What improvement would a Catch Can provide this motor?     And given all this I expect that IF I installed one I'd see some water/gas/oil vapor accumulation. Byproducts of normal combustion.   Having said that, IF my motor used an appreciable amount of oil I'd consider it a useful 'crutch' until I had the situation corrected OR if bore polished, until I junked it or rebuilt it to stave off repeated plug fouling.    I'm not telling you what I THINK. But what its DONE.          
    • Grumpy Bear
      Starting a new thread regarding mounting my 2014 OEM wheels to my 2026

      By Grumpy Bear · Posted

      Love the look. I'm a SCSB lover myself.    Two items. 1.) A spacer changes scrub radius but this also changes when we use wheels of different offsets. A little isn't a big deal. 2.) Steel wheels, alloy wheels all have different thickness. Same effect on the stud and lug nut as a spacer. When hub centric the wheel isn't supported by the stud. It's supported by the hub. The stud just keeps it all together.  
    • JAI3
      2016 Sierra 5.3L L83 new injectors now runs rich.

      By JAI3 · Posted

      I had a evap sol go bad a couple weeks ago. . I replaced it.  While watching live data at the time I saw I had some cylinder 1 misfires. No MIL but on live data I could see ~50 at startup and about 70 more after an hour a drive all on cyl 1.  I also noticed that the LTFT were -5% to -15% always.  And that bank 2 is always -3% richer than bank 1. Even across all driving modes, city, highway, etc it’s always 3% richer than bank 1. So I start with the misfire. Swapped coil, plug, and plug wires from 1 to 3. No follow. I got an Injector reseal kit, pulled the D/s injector rail, swapped #1 and #3 injectors, resealed them, reinstalled and retested.  The misfire followed to 3. So I ordered and replaced all 8 injectors, spark plugs, and plug wires. Also replaced the 1 time use fuel pipes under the intake manifold.  Injectors that were in the truck since new were  Part # 12668390.  I replaced them with # 12742701 Got from RockAuto. Pretty certain they’re genuine and the correct ones. I called a friend at a parts store who told me “the 12742701 were the correct superseded part # for the originals I was replacing”. So started truck after replacing all that and it’s running -15 - -30 LTFTs. I reset the fuel trims with GDS2 and drove it for a 60 miles trip each way. There have been no changes in the LTFTs.  I checked if the HPFP was leaking into the crankcase. I removed the pvc and watched the trims. No difference.  I checked the alcohol content and it was at 10%  I’m out of ideas here. Truck seems to run great. Just always rich on the fuel trims.  Anyone with any help or ideas would be greatly appreciated.  I ran an injector balance test just for the heck of it and it came back this. I’m confused.  I have gds2 and some other diag tools if anyone knows of anything I should test next.
    • Coastie05
      Will not stay in Reverse

      By Coastie05 · Posted

      Definitely needs to go back to the dealer. 
    • Grumpy Bear
      Wow I'm in a pickle. (Broke down truck) and a story.

      By Grumpy Bear · Posted

      No, but don't skimp on safe! 😉 

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...