Is this normal and is it from the engine or trans? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Houston Ben · 08-11-2014, 09:29 AM

Hey all,
I have had this question in my head for a long time but just been ignoring it. I have a 2011 5.3 w/6L80. You know those times where you slam on the gas and the tranny kicks down but for whatever reason (someone cut you off) you have to let back off real quick? Well when I do that my tranny seems to not know what to do for a few seconds but there is still all this buildup in the engine (high rev)and then it sounds like my truck farts and all that pent up energy is released, is this normal?

**truckdude239** · 08-11-2014, 04:46 PM

no...

woodwright · 08-11-2014, 10:39 PM

Yeah, vehicular flatulence is never good

Houston Ben · 08-11-2014, 10:56 PM

Lol, it seems to release through the exhaust but sounds funny

**Hart_Rod** · 08-12-2014, 11:23 AM

Can be adjusted in your tune...

Houston Ben · 08-12-2014, 12:24 PM

Guess I will have to wait till I get HP tuners because I hate driving to my tuner.

BR3W CITY · 08-12-2014, 12:55 PM

Not a single code or anything happens during this? I can honestly tell you I've never heard of a problem like that...
IF there was a way for power to "build up", then it would all be lost in heat and slip at the convertor if it didn't know where to go. Unless that noise is you massively slipping past the convertor...

The valves go through their events each power cycle, so its not like you can actually "trap" air or fluid anywhere to build up.

When you stab the gas and lift off right away, there is something called DFCO with is basically decel fuel cutoff or enrichment. Depending on your fueling and how that is setup, you could be in a fueling situation that triggers the odd behavior. Without a log or the tune live it may be hard to tell.

Houston Ben · 08-12-2014, 03:44 PM

Thanks for all the replies, much appreciated. No codes at all, it's weird... only happens when I stomp on it, tranny kicks down but I let off the gas before the power kicks in. it almost sounds like an air brake like the big rigs have. Other than that she drives good.

BR3W CITY · 08-12-2014, 08:54 PM

Quote:

Originally Posted by Houston Ben

Thanks for all the replies, much appreciated. No codes at all, it's weird... only happens when I stomp on it, tranny kicks down but I let off the gas before the power kicks in. it almost sounds like an air brake like the big rigs have. Other than that she drives good.

Its also possible that there is a problem in the tune with the lockup settings,or a problem with your tcc wiring.

08-11-2014, 09:29 AM	#1
Houston Ben Registered User Join Date: May 2013 Location: Houston Texas Posts: 713	Is this normal and is it from the engine or trans? Hey all, I have had this question in my head for a long time but just been ignoring it. I have a 2011 5.3 w/6L80. You know those times where you slam on the gas and the tranny kicks down but for whatever reason (someone cut you off) you have to let back off real quick? Well when I do that my tranny seems to not know what to do for a few seconds but there is still all this buildup in the engine (high rev)and then it sounds like my truck farts and all that pent up energy is released, is this normal?

08-11-2014, 04:46 PM	#2
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,230	Re: Is this normal and is it from the engine or trans? no... __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube

08-11-2014, 10:39 PM	#3
woodwright Enjoying left field Join Date: Jun 2008 Location: Dillon Montana Posts: 900	Re: Is this normal and is it from the engine or trans? Yeah, vehicular flatulence is never good __________________ Clint 70 Chevy 4WD "Ultimate Work Truck" SOLD

08-11-2014, 10:56 PM	#4
Houston Ben Registered User Join Date: May 2013 Location: Houston Texas Posts: 713	Re: Is this normal and is it from the engine or trans? Lol, it seems to release through the exhaust but sounds funny

08-12-2014, 11:23 AM	#5
Hart_Rod ************* Join Date: Apr 2005 Location: Pensacola, FL Posts: 17,837	Re: Is this normal and is it from the engine or trans? Can be adjusted in your tune... __________________ Rob - https://www.instagram.com/hart_rod_c10 As Iron Sharpens Iron, So One Man Sharpens Another. Proverbs 27:17 FOR SALE: DBW pedal bracket - http://67-72chevytrucks.com/vboard/s...d.php?t=651123 FOR SALE: Hood Brackets http://67-72chevytrucks.com/vboard/s...d.php?t=679945 1987 Silverado SWB - 34.5K original miles http://67-72chevytrucks.com/vboard/s...d.php?t=801834 1969 SuperBurb - http://67-72chevytrucks.com/vboard/s...d.php?t=200387 1968 Farm truck - http://67-72chevytrucks.com/vboard/s...d.php?t=358692 1968 SWB - http://67-72chevytrucks.com/vboard/s...d.php?t=551258 1948 Chevy - http://67-72chevytrucks.com/vboard/s...=122164&page=3

08-12-2014, 12:24 PM	#6
Houston Ben Registered User Join Date: May 2013 Location: Houston Texas Posts: 713	Re: Is this normal and is it from the engine or trans? Guess I will have to wait till I get HP tuners because I hate driving to my tuner.

08-12-2014, 12:55 PM	#7
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: Is this normal and is it from the engine or trans? Not a single code or anything happens during this? I can honestly tell you I've never heard of a problem like that... IF there was a way for power to "build up", then it would all be lost in heat and slip at the convertor if it didn't know where to go. Unless that noise is you massively slipping past the convertor... The valves go through their events each power cycle, so its not like you can actually "trap" air or fluid anywhere to build up. When you stab the gas and lift off right away, there is something called DFCO with is basically decel fuel cutoff or enrichment. Depending on your fueling and how that is setup, you could be in a fueling situation that triggers the odd behavior. Without a log or the tune live it may be hard to tell. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

08-12-2014, 03:44 PM	#8
Houston Ben Registered User Join Date: May 2013 Location: Houston Texas Posts: 713	Re: Is this normal and is it from the engine or trans? Thanks for all the replies, much appreciated. No codes at all, it's weird... only happens when I stomp on it, tranny kicks down but I let off the gas before the power kicks in. it almost sounds like an air brake like the big rigs have. Other than that she drives good.



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