Engine Surge

[Koppster]

My 6.2 engine surges from time to time. Only happens at very low speed, almost always when in a parking lot making a turn in to a space, etc.

Same thing happened with my 21 LTZ 5.3. Might be me but I have paid attention and have not observed anything I'm doing.

A little scary.

Thanks
Rick

 

[MO_ZR2]

Maybe expand a bit on “surge”? Noteworthy RPM jump? Brake slippage? Never had anything like this personally.

 

[Koppster]

Maybe expand a bit on “surge”? Noteworthy RPM jump? Brake slippage? Never had anything like this personally.

The engine accelerates briefly, tends to surprise me when it happens. I don't believe my foot is on the gas when it happens.

 

[MO_ZR2]

have you had others try to park it to see if it’s consistently happening? If others see it repeat for them, then I would recommend a trip to the dealer so they can see it happen and begin to debug it. If it doesn’t happen to others…need to check brake/skinny pedal foot contact when parking my friend

 

[cgrubb1]

Mine does it at startup every now and then. Will rev up to 2000-2500 rpms for a second or 2 before it goes back down. Never done it out of park though

 

[mw90001]

What kind of floor mats do you have? Make sure nothing is inhibiting your throttle pedal.

 

[wutang61]

I will say that the throttle tuning of these trucks is heavily slanted towards economy. Big delays are built in to filter out “unintended user throttle input”.

As a result power delivery at slow speed can be Surge-y. I’d do anything to go back to a physical throttle cable in modern cars.

Anything for the CAFES and the tailpipe emissions.

 

[MAXRPM]

My 6.2 engine surges from time to time. Only happens at very low speed, almost always when in a parking lot making a turn in to a space, etc.

Same thing happened with my 21 LTZ 5.3. Might be me but I have paid attention and have not observed anything I'm doing.

A little scary.

Thanks
Rick

Did you ever figure out what is causing this surge? Mine is doing it exactly as you describe.

 

[MAXRPM]

I will say that the throttle tuning of these trucks is heavily slanted towards economy. Big delays are built in to filter out “unintended user throttle input”.

As a result power delivery at slow speed can be Surge-y. I’d do anything to go back to a physical throttle cable in modern cars.

Anything for the CAFES and the tailpipe emissions.

Is there a fix to the surge?

 

[wutang61]

Is there a fix to the surge?

A Throttle controller would negate the pre programmed delay.

Any new truck will drive like ass until the TCM completes the learn.

If you have a decent scanner you can also force a relearn. Which I would do if I ever bought a throttle controller.

 

[SGRACING]

The engine accelerates briefly, tends to surprise me when it happens. I don't believe my foot is on the gas when it happens.

I too have noticed the very same engine rpm surge, mainly in the parking lot ... strange...
It doesn't do it all the time just at low rpm.

 

[SGRACING]

A Throttle controller would negate the pre programmed delay.

Any new truck will drive like ass until the TCM completes the learn.

If you have a decent scanner you can also force a relearn. Which I would do if I ever bought a throttle controller.

Not buying the relearn thing . All my vehicles go through the learning thing and settle in unless I upset the curve. But the surge thing has happened since day one .. I have thought it would have gone away by now.. I have ten k miles now. One thing for sure the Range DFM delete makes for a smoother operating cycle !

 

[ZR2BIZON]

I can't remember what thread but the poster said it turned out to be the cruise control buttons getting accidentally activated while parking or low speed turning.

 

[Koppster]

Did you ever figure out what is causing this surge? Mine is doing it exactly as you describe.

MAXRPM, I have not figured it out, it happens rarely but as stated, exact same events on two different trucks, my ZR2 with 6.2 and my former LTZ with 5.3.

 

[MO_ZR2]

Happens to me on occasion…I wear size 12 Crispi mountain boots (stiff with thick sole) and I occasionally will press gas and break simultaneously on all three of my trucks, no joke. Took me a minute to figure it out but it is/was all lead foot related.

 

[AXE]

I can't remember what thread but the poster said it turned out to be the cruise control buttons getting accidentally activated while parking or low speed turning.

I can vouch for this sketchy phenomena cause it happened to me just a few days ago in a parking lot while making a turn. I knew I had hit my cruise cause it accelerated right when I lifted off the throttle and was running the steering wheel across my open palm. I noticed the adaptive cruise message was on when I looked down at the DIC and started to brake.

 

[MAXRPM]

Happens to me on occasion…I wear size 12 Crispi mountain boots (stiff with thick sole) and I occasionally will press gas and break simultaneously on all three of my trucks, no joke. Took me a minute to figure it out but it is/was all lead foot related.

Thanks for the laugh Bigfoot I will check my feet next time for sure!