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I have had this problem for quite some time. I've been trying to narrow it down one test and one part at a time with no luck. It will occasionally drive great with no problems but other times it surges while accelerating and driving down the road. I've had the timing checked, replaced the spark plugs, replaced the wires a while back, replaced the EGR valve, and replaced the cap and rotor. The truck will idle fine except for the occasional rough idle in gear during the times the truck is running badly. Any suggestions would be appreciated. Thanks.
Hello all, I am having a bit of trouble with my truck when under light throttle. Between 1000-1700rpm when driving with no load my 5.3L starts to surge about 50rpm with a increase in felt power when it happens. I am also hearing a vibration or light grinding sound. From my reading I’m thinking this could be a torque converter issue maybe the shift solenoid. When the truck is in tow mode I don’t notice the issue but if I leave grade braking on when the truck downshifts it does not feel normal or what I’m used to when I tow. It’s somewhat harsher. Thank you all for your time I sure appreciate everyone. Update: I just noticed when I go between Drive and Reverse it’s takes it a second to move then it jumps a little. Checked trans fluid looks good.
It hesitates a little on almost every take off from a stop. Much more pronounced if I throttle it more. I.E. it is impossible to just launch out from a light most of the time. It's just sluggish until it kicks in after a second. The worst is around 45-50 in OD under partial load just trying to maintain speed... It misses enough to shake the whole truck and I have to punch it to get out of OD so I don't feel it anymore. I'm sure it's missing a little at other times but I can't feel near as much if the torque clutch is not engaged. I got a new MAF free from my neighbor so I threw it on today but it made no difference. My long term fuel trims are near zero at idle but jump up near 20 under acceleration and while driving they maintain around 15 or more. Do I just need new injectors? I have gotten a lean code both banks before but it's been a few months since that came up. New fuel pump only about a month old. Made no difference at all. I also did intake manifold gaskets this year. No change really. Need more ideas. Thanks!!
Hi all, Pseduo newbie here. Not new to mechanics or even GM trucks, just new to the GMT900 platform. Hoping you guys could help me out. I've searched google and this forum looking for answers, but have not been able to find anything similar to what I'm experiencing. Please forgive me if I missed an obvious thread. I'm not entirely sure what I need to be searching for. Was hoping you guys could steer me. We bought a low miles (71K) 2009 Silverado from a dealer recently, and it started having transmission issues within 1,000 miles. It came with a dealer-provided lifetime power-train warranty, but so far, the experience with the dealer defines the very essence of poor experience. They basically drive it a couple miles, not even far enough to get it warmed up, and then spit out the trusty old "could not replicate". So, I'm looking for a direction to point them, or maybe even a TSB? 2009 Silverado 1500 CCSB Z71, LC9/6L80E. Factory tow package. What is happening is this: When the transmission has warmed up, and you're going generally over 50mph, but sometimes slower, when coming to a stop the truck will surge and try to pull for a brief moment. And sometimes it will do this 2-3 times in rapid succession. It isn't really that the engine is surging, it feels more like the torque converter is locking/ unlocking rapidly. But, it will pull, even with you off the gas, and holding the brake. And if you watch the tachometer, it seems to synchronize with the downshifts the transmission makes as you're slowing. In a few cases, it has taken up all the drivetrain slack pretty suddenly and led to some fairly audible clunking/jerking. I should note, this transmission also has the very hard 2-3 shift, but, again, the dealer "can no replicate", at least not on their dime. Now, I saw some reference on a Pontiac forum, under the 6l80E in the G8, reference a software update released for 2009 trucks, but could not find anything about it anywhere else. I asked the dealer to check for software updates, but was told there was none. Has anyone had a similar experience with the TC locking/unlocking? Thanks in advance.