Jump to content

rev limiter/delayed shift

calgator73

By calgator73
in Engines & Drivetrain

Recommended Posts

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...

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Latest Articles

  • Posts

    • newdude
      Seems to be Missing a lot of Updates

      By newdude · Posted

      Based on what I can tell, yes.   As for updating it, its a mixed bag.  Updates do fix a lot of issues, but occasionally can create some oddities.  They do more good than harm though overall.     Here's what the most current one does and a  V171 Improvements Important: Improvements will vary by model, build configuration, system, and sales region. Not all vehicles have all features. OnStar and Wi-Fi may not work after remote start CarPlay may not automatically reconnect Part of the Driver Attention messaging screen may be in English even though the language is set to something else XM may not work After a dead 12V the radio may set to Arabic at each startup Bluetooth contacts might not be able to sync with the vehicle During an OTA the 12V battery may drain Customer might see a screen telling them to return to the dealer After changing the Wi-Fi SSID or password a device may not disconnect If a device is connected on the 2.4Ghz band, nothing will connect to the 5Ghz one, which could show as slow Wi-Fi speeds Customers might have noticed Wi-Fi dropping in certain areas and reconnecting later Customer might see the top of the screen blinking during Android Auto Android Auto may not connect CarPlay audio might momentarily cut out The "Add Phone" button may be grayed out The radio may not start up   V167 Most Notable Improvements:   Outside Air Temperature is incorrect. -You may see a popup message for Engine Shift. (Corvette Only) After changing the exhaust sound they get a popup that "mode change not applied", even though it was. -When changing volume, the volume bar is for Traffic instead of Audio. -(Corvette Only) Improvements to the placement of buttons and text. -If the customer receives the message "Apple CarPlay Could not connect", the cursor might move in the opposite direction than expected when using the control knob. -Android Auto automatically starts playing their music, even though they have turned that off in settings. -Intermittently they have a red OnStar LED with no OnStar function and/or no audio. -The minimum length of the Wi-Fi password was increased to 12 characters. -The popup message "Driver Attention Check, check your mirrors or Super Cruise will shut down" may not have come up on the display when it should have. -Startup animation added for 20th anniversary of the V-Series on Cadillacs. -The Navigation app received location improvements when going under long underpasses. -In the Navigation app there are filters for charging points that the vehicle cannot use.   V164 Most Notable Improvements Most notable improvements contained in this release may include: Apps Intermittently, an “SD Card Removed” message will pop up in the Navigation app. While in the audio app, the radio may stop working. Trailer Tire Pressure sensors may not be learned in the Trailer app. Not being able to return to the home screen while in the Camera app. After an ignition cycle, the radio might go to a black screen or stop working if using Sirius XM. Spotify icon truncated on Audio app.   SXM When changing power modes with the ignition switch, the HVAC pop up might appear. During startup, the radio will show the brand splash screen then go blank. Receiving a confirmation pop-up when changing drive modes. A “Return to Dealer” message may appear on the radio screen. SuperCruise setting toggle may not work. System After an ignition cycle, the radio might go black or stop working if using Sirius XM (SXM). Settings When performing a factory reset, the radio may stop working. After performing a factory reset, the radio may stop working when trying to switch users. When trying to go into the Language section quickly after startup, the radio may stop working. Projection Wireless CarPlay cannot be connected after unpairing another wireless Android Auto device. When the Android Auto screen comes up to connect wirelessly, the screen may freeze if the Cancel button is pressed. Removed the Apple CarPlay Cannot Connect screen when a device fails to pair during the autoconnect process. CarPlay information may not show up in the audio app. Near Field Communications (NFC) chime may be heard when NFC does not work. The Cannot Connect screen does not pop up after the first connection on wireless CarPlay fails. Apple CarPlay is now functional in Guam. Over the Air (OTA) When a software update is cancelled, the downloading logo may still be displayed. Energy When using the Energy app, the radio may stop working. When plugging in the vehicle, the display might show “Now” instead of “Charging Upon Plug In.” Instrument Cluster Voice recognition can be started while on an OnStar or phone call. When downloading contacts, there is a progress bar and circles on the Recents page of the cluster. The temperature on the cluster and the display may be different. After receiving and ending a call on the secondary paired phone, the cluster may get stuck on the phone menu. Bluetooth Intermittent Bluetooth connection loss.
    • AndrewF
      Front End Rattle

      By AndrewF · Posted

      Looking for help troubleshooting a metallic like front end rattle. Figured I’d see if anyone had thoughts before I schedule an appointment with the dealer.   The rattle is fairly loud and occurs primarily when the front driver side wheel hits a bump, even fairly minor road seams. Sometimes does it when the passenger hits a bump but I don’t believe when the rear hits. Rattle still occurs when foot is pressing brake peddle so I think that rules out the caliper rattle I’ve read about. I’ve also checked the running boards and they are tight.   Most noticeable at slow speeds.    Any insight is appreciated. 
    • KARNUT
      What did you do to your "other" car (aka musclecar) today

      By KARNUT · Posted

      We try to make cruise the coast. It’s where our favorite casino is. I only want to spectate. Never took a car. Always had one to take. I belonged to a club once. Even when I used to drag raced. It was during test and tune. Probably because I’m not a night owl, party person. 
    • RyanbabZ71
      What did you do to your "other" car (aka musclecar) today

      By RyanbabZ71 · Posted

      We had a pretty big cars and coffee in Indy this past weekend.  Pretty much anything and everything was there.  
    • Atlas
      What did you do to your "other" car (aka musclecar) today

      By Atlas · Posted

      Good looking Olds, and TRX!   I haven't been into car shows either. I'm probably not a convert but I did push myself this year to attend a few select events to challenge some assumptions and try to experience car-based social clubs in a different way. I joined up with the local Hagerty group for some cars/coffee events, group drives. A month ago I showed my '94 Camaro I rescued last fall at Radwood. Had a good time, but, there was some sitting around with the car and that's the part of shows I don't enjoy as much. I prefer to be a spectator, walk the show, grab a burger, go home.   Radwood was the only era-limited event, but where it had strict model year limitations, it made it up in variety. Having Jason Camissa there was also a hoot.   Where I see old 50's car shows, doo-wop and winga dinga music stuff fading out, same with "only" vintage muscle clubs, it seems to be the activity-based clubs/events which are gaining strong popularity. Places where all cars and interests come together.

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...