2012 chevrolet silverado 4 wheel 5.3 intermediately miss

Question

I have a 2012 chevrolet silverado 5.3 that does not show a code. I took to dealer and they changed plugs and wires. Not resolved
At 1500 rpm on a slight pull with temperatures outside above 92, it appears to miss intermediatley
When cool the problem does not exist
Problems go away if throttle is opened
Any idea?

Answer 1

This might be something your going to have put up with or wait till it gets worse. Here is a Bulletin Chevy put out about some of the characteristic

# PIP4112N: Normal Characteristic - Sag Or Hesitation On Acceleration - (Jan 17, 2014)

Subject:            Normal Characteristic - Sag Or Hesitation On Acceleration

Models:             2008-2014 Buick Enclave
                    2010-2014 Buick LaCrosse
                    2011-2014 Buick Regal
                    2012-2014 Buick Verano
                    2013-2014 Buick Encore
                    2006-2009 Cadillac XLR, XLR-V
                    2006-2011 Cadillac STS, STS-V
                    2007-2014 Cadillac Escalade, Escalade EXT, Escalade ESV, SRX
                    2008-2014 Cadillac CTS
                    2013-2014 Cadillac ATS, XTS
                    2006-2014 Chevrolet Corvette
                    2007-2013 Chevrolet Avalanche
                    2007-2014 Chevrolet Silverado, Suburban, Tahoe
                    2008-2014 Chevrolet Equinox, Malibu
                    2009-2014 Chevrolet Traverse
                    2010-2014 Chevrolet Camaro, Cruze, Express
                    2011-2014 Chevrolet Caprice
                    2012-2014 Chevrolet Captiva Sport, Impala, Orlando, Sonic
                    2013-2014 Chevrolet Trax
                    2014 Chevrolet SS
                    2007-2014 GMC Sierra, Yukon, Yukon XL
                    2008-2014 GMC Acadia
                    2009-2014 GMC Terrain
                    2010-2014 GMC Savana
                    2008-2011 HUMMER H2
                    2007-2010 Pontiac G6
                    2008-2009 Pontiac G8
                    2008-2009 Pontiac Torrent
                    2007-2009 Saturn Aura
                    2008-2010 Saturn Outlook, Vue
                    Equipped With a Gasoline Engine and Automatic Transmission

 

This PI was superseded to update model list. Please discard PIP4112M.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern

Some customers may comment on a sag or hesitation when accelerating under the following conditions:

When coasting with a closed throttle and then aggressively applying the throttle. Examples of this maneuver include a rolling stop or a lane change maneuver. In this type of maneuver, even though the accelerator is applied aggressively, the throttle blade is opened slowly for up to 0.7 seconds to help minimize drive-line lash and clunking.

Also in a vehicle equipped with a six speed automatic transmission when making a hard, complete stop with a closed throttle, immediately followed by an aggressive throttle opening the transmission down-shifts may not be completed by the time the throttle is opened. As a result approximately 0.5 seconds of ?zero? torque may be commanded to allow the shift to first gear to occur.

Recommendation/Instructions

Both of the above conditions are a result of Torque Management and both of these conditions should be considered normal and no repairs should be attempted.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.