Hello, to all well this is my problem with my 2007 tahoe 4x4 5.3flexfuel built 3/07 i bought it in september 2007 i been with the truck for about 2 months and i have noticed a rough idle, and will not go away some times is very rough sometimes is not....i took it in to the dealer 4 times and didnothing just a stupid scan.....also in those 4 visits i told the about a shifting problem. when i am at a complete stop and then go from 1st to 2nd shift at about 2300 rmps i feel whe the rpms drop kind of like a pull back then go it also does it for 2nd to 3rd gear is this normal? this is my first suv so i dont know if its normal but it doesnt feel right because its very anoying also when in trafic ant a stop and go situation i hit 10mph and i let go of the accelerator the truck will do a jerky shift, and when im over 10mph and stop then go it will do a small bank into 2nd gear. have any of you guys had these problems or are these normal?this is very annoying that the techs say its normal also i almost forgot the transmission oil kinf of smells like candy is that normal?
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PLEASE HELP..........ZX I KNOW YOU ARE LIKE THE KING HERE CAN YOU HELP ME? IVE READ MANY MANY POST AND IT LOOKS LIKE YOU ARE THE MASTER.....OR ANYONE PLEASE HELP THESE A HOLES AT THE DEALER ARE DOING NOTHING BUT SCANING AND TEST DRIVE AND THE TRUCK STILL THE SAME....
Without being able to drive the truck so I can experience the symptoms first hand I can only say that:
The rough idle is sometimes normal and can be the result of a number of things that are essentially minor or even non-issues such as fuel quality or slight water or condensation contamination, certain environmental conditions can cause a rough idle. If the ECM detects even a slight misfire as a result of an engine fault it will set a code and light SES.
Try using a good fuel system cleaner such as Chevron Techron for this.
The power being pulled back slightly also maybe the torque management system, this system is designed to smooth shifts and prevent transmission damage, it reduces engine power slightly just before the transmission makes a gear change, most people don't notice this or find it objectionable but not all.
Sometimes the 4L60E transmission will have a firm shift as well, this is a normal (albeit somewhat annoying) attribute as well.
My advice is to have the dealer make sure that the ECM and TCM modules have the latest software calibrations installed.
The new GM brand Dexron-VI transmission fluid has the cotton-candy odor added to make it easier for a technician to discern if the fluid is burnt (I am not joking). The synthetic GM Goodwrench gear lube has a grape smell added for the same reason, so long as it does not have a burnt smell you are good to go.
YEAH ZX IS A GRAT GUY....all of the responces from the techs were just B/S and they just sent me home i took it in 4 times and my truck still has a slight rough idle i did put some techron on 2 full tanks i did help a bit should i put some more or just let it smooth out on its own?