Announcement

Collapse
No announcement yet.

5.3l Chevy Tahoe No Guts on STEEP Pull...

Collapse
X
Collapse
First Prev Next Last
 
  • Filter
  • Time
  • Show
Clear All
new posts

    5.3l Chevy Tahoe No Guts on STEEP Pull...

    Okay guys, I’m having an odd issue.

    Today I towed my trailer and full gear up about an 11% grade. No codes come up on the DIC, this never happens any other time, only when I tow up this mountain. It’s a rutted up, rough driveway up a mountain. Basically it feels absolutely gutless, even in manual 1st.

    Is the motor due for a rebuild, too much weight at that grade and a dead stop? Gearing?

    I’m at a loss. I don’t think it’s fuel, because I had a full tank, new fuel pump and lines. Maybe something like a solenoid that could be doing this?

    #2
    I used this Tahoe prior and didn’t notice an issue until last time and this time. I put my foot to the floor and it feels like it has zero power.

    Comment


      #3
      Knock sensors picking up rattles and klunks and pulling all timing? Exhaust touching the frame and rattling is enough for the knock sensors to pick up.

      Comment


        #4
        Originally posted by Rennat_2006 View Post
        Knock sensors picking up rattles and klunks and pulling all timing? Exhaust touching the frame and rattling is enough for the knock sensors to pick up.
        Wouldn’t that cause it to sputter and run like shit?

        Comment


          #5
          How much weight is trailer and full gear?

          Comment


            #6
            Originally posted by FleshEater View Post

            Wouldn’t that cause it to sputter and run like shit?
            No just runs like a slug

            Comment


              #7
              Originally posted by Crankylove View Post
              How much weight is trailer and full gear?
              This time we unloaded the machine at the bottom of the mountain. Trailer was about 1,000lbs. Gear was clothes for 3 guys, tools, fluids, 6 cases of beer and 5 cases of water.

              If it’s the knock sensor, how do I remedy that?

              Comment


                #8
                Originally posted by FleshEater View Post
                Okay guys, I’m having an odd issue.

                Today I towed my trailer and full gear up about an 11% grade. No codes come up on the DIC, this never happens any other time, only when I tow up this mountain. It’s a rutted up, rough driveway up a mountain. Basically it feels absolutely gutless, even in manual 1st.

                Is the motor due for a rebuild, too much weight at that grade and a dead stop? Gearing?

                I’m at a loss. I don’t think it’s fuel, because I had a full tank, new fuel pump and lines. Maybe something like a solenoid that could be doing this?
                Maybe because it is really hot the fan clutch was locked up and the pcm pulled some timing?

                Comment


                  #9
                  Originally posted by DMG View Post

                  Maybe because it is really hot the fan clutch was locked up and the pcm pulled some timing?
                  It’s a 2010, GMT 900 with an electric fan...

                  The knock sensor makes sense. The trailer bouncing could even set it off.

                  Comment


                    #10
                    Might be a dumb question, but was traction control going nuts? Did it drive fine everywhere else? I’m thinking with that grade, on a rough road, it could be slipping and tc trying to keep it from slipping.

                    Comment


                      #11
                      Originally posted by FleshEater View Post

                      It’s a 2010, GMT 900 with an electric fan...

                      The knock sensor makes sense. The trailer bouncing could even set it off.
                      I don’t think a trailer bouncing will set off a knock sensor. They are separated by rubber motor mounts and buried in the valley of the motor. A sensor could be going bad though.

                      This sounds more like torque management plus not quite the right gear ratio for the job.

                      Comment


                        #12
                        Originally posted by DMG View Post

                        I don’t think a trailer bouncing will set off a knock sensor. They are separated by rubber motor mounts and buried in the valley of the motor. A sensor could be going bad though.

                        This sounds more like torque management plus not quite the right gear ratio for the job.
                        +1
                        A knock sensor affects timing. But only at that instant when it detects the engine knocking. if it adjusted timing to the point that you lacked power you woild probably hear/feel the engine bucking or run rough.

                        I think your trans decided to try it in a higher gear. Shift manually or stop the skinny pedal till she kicks down

                        Comment


                          #13
                          Originally posted by Rttoys View Post
                          Might be a dumb question, but was traction control going nuts? Did it drive fine everywhere else? I’m thinking with that grade, on a rough road, it could be slipping and tc trying to keep it from slipping.
                          Traction control never kicked on.

                          It towed fine through all the mountains, plenty of power.

                          Comment


                            #14
                            Originally posted by DMG View Post

                            I don’t think a trailer bouncing will set off a knock sensor. They are separated by rubber motor mounts and buried in the valley of the motor. A sensor could be going bad though.

                            This sounds more like torque management plus not quite the right gear ratio for the job.
                            Now, what if the motor mounts would be bad, which mine probably are the original mounts with 132k on them? This car towed this up the driveway perfectly fine when they had it smoothed over at the beginning of the year. Now that it's all rutted up and washed out, I'm having issues.

                            If a sensor was going bad, I feel it would give intermittent issues, but it doesn't.

                            Comment


                              #15
                              Originally posted by Fishnbeer View Post
                              +1
                              A knock sensor affects timing. But only at that instant when it detects the engine knocking. if it adjusted timing to the point that you lacked power you woild probably hear/feel the engine bucking or run rough.

                              I think your trans decided to try it in a higher gear. Shift manually or stop the skinny pedal till she kicks down
                              I was manually shifted in 1st, pedal to the floor.

                              I'm going to put new motor mounts and transmission mount on and see if it helps for the next tow.

                              Comment

                              Working...
                              X