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rev limiter/delayed shift

calgator73

By calgator73
in Engines & Drivetrain

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calgator73 Senior Enthusiast

calgator73

Posted
Posted

I'm not sure if something is wrong or not. I've had a 2007 denali with the 6l80 and a g8 with the same. Downshifts from 30-40 are sometimes hard but always precise. On my last tank of E85 in my 2014 (steady cruising @ 45) I floored it. Truck downshifted and engine revved correctly. When it was time to upshift it practically fell on it's face. Not sure if it's a rev limiter issue or some kind of delayed shift. Tried again today on regular and once in four attempts did I get it to act weird. Not getting any indication of traction issues (no idiot light blinking) Thoughts?

Cliff14Denali Enthusiast

Cliff14Denali

Posted
Posted

I had that happen to me as well. Truck went to shift WOT into 2nd gear and just hesitated/vibrated into 2nd gear.

calgator73 Senior Enthusiast

calgator73

Posted
  • Author
Posted

Today part throttle acceleration from a stop. At around 35 all power was pulled back for about a second or two then it shifted to 2nd

00Silverado4x4 Senior Enthusiast

00Silverado4x4

Posted
Posted

With all the torque management that must be in these trucks, it doesn't surprise me the engine feels doggish at WOT. In my truck's case I get better accel with only 3/4 throttle vs WOT. Guess we all need get a tune & enjoy.

  • 1 month later...
bboyce536 Enthusiast

bboyce536

Posted
Posted

Sorry for digging up an old thread, but the other day merging on the freeway my truck did this. My 2nd to 3rd upshift, my truck hit the rev limiter in 2nd and just lost all power for almost half a second before shifting. Not sure what was going on there...

calgator73 Senior Enthusiast

calgator73

Posted
  • Author
Posted

I think it might be related to that bulletin (I'll have to dig it up again) but the dealer could not duplicate and it set no codes. I also had the sloppy (sounded/felt like a slip shift) 2-3 at times but only when tranny was hot. Have to wait until summer camping season I guess to replicate consistently.

calgator73 Senior Enthusiast

calgator73

Posted
  • Author
Posted

I think it might be related to that bulletin (I'll have to dig it up again) but the dealer could not duplicate and it set no codes. I also had the sloppy (sounded/felt like a slip shift) 2-3 at times but only when tranny was hot. Have to wait until summer camping season I guess to replicate consistently.

http://www.gm-trucks.com/forums/index.php?/topic/-Transmissions-Issues/Problems
bboyce536 Enthusiast

bboyce536

Posted
Posted

Link won't work. I have read up on some transmission threads with them clunking, but this seemed significantly different. I have numerous times used manual mode to shift and haven't upshifted quickly enough and had it hit the rev limiter and that is exactly what it felt like on the freeway...except I was in drive. Honestly think it is a combination of Tq. management and low line pressure.

bboyce536 Enthusiast

bboyce536

Posted
Posted

Yea 3/4th does better than wot at a stop. Either way i cant spin the wheels tuned

Are you talking about our 14 trucks? Only reason I ask is because if I mash mine to the floor from a stop I can leave a 50-75 foot black 11 and I am not tuned.

02suburbanZ71 Senior Enthusiast

02suburbanZ71

Posted
Posted

Im talking about spinning wheels in my 02. But yes i've driven many 2014 silvys and they do get best off the line with 3/4th pedal at least thats with my experience with them

calgator73 Senior Enthusiast

calgator73

Posted
  • Author
Posted

Link won't work. I have read up on some transmission threads with them clunking, but this seemed significantly different. I have numerous times used manual mode to shift and haven't upshifted quickly enough and had it hit the rev limiter and that is exactly what it felt like on the freeway...except I was in drive. Honestly think it is a combination of Tq. management and low line pressure.

Here you go...http://www.gm-trucks.com/forums/topic/157944-transmissions-issuesproblems/?p=1532501...

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