Menu

There is another issue with my 2001 Gmc Sonoma

Home Forums Stay Dirty Lounge Service and Repair Questions Answered Here There is another issue with my 2001 Gmc Sonoma

  • Creator
    Topic
  • #852272
    Mike LydenMike Lyden
    Participant

      About a week or so ago I had posted about my 2001 GMC Sonoma stalling and not starting. It is now still awaiting fuel pump replacement as we are positive that is what it is. Another issue that I have with it is something in the front end it seems. When you are driving you acts normal with no issues. When you apply the brakes and slow down at any time the brake pedal “throbs” and you can feel it. It acts like it is going over small speed bumps. I have changed brake pads, rotors, calipers, tires where changed before this winter. One person told me it could be the speed sensor but it doesnt do anything at speed while driving only when you apply the brakes. The lines have been checked and bled. The brakes act fine and stop very well. Recently ball joints were done and it didnt do that before that was done but my neighbor who has done those said he doesnt think that would do that and has ridden in the truck with me and can feel it just riding in it too when i use the brakes and heard the thump it makes too that you can feel in the pedal. Any idea what this could be. Could the axle on the one side that is the only thing I not sure if the mechanic tried looking at. It also comes from the passenger side. driver seems “normal”

    Viewing 15 replies - 1 through 15 (of 15 total)
    • Author
      Replies
    • #852276
      Nightflyr *Richard Kirshy
      Participant

        Have you inspected the ABS sensors and tone rings?

        #852277
        Nicholas ClarkNicholas Clark
        Participant

          nightflyr is right. I would check there first. But be careful that you didn’t torque the lug nuts down so hard that you warped the rotors.

          #852327
          Mike LydenMike Lyden
          Participant

            It did it both before and after replacing the rotors. I originally thought the rotors where warped so i changed both. The ABS system isnt even working. Five years ago now the Abs computer or whatever you call it started to make a hum or buzz noise and I took the ABS fuse out and it stopped. The brakes worked fine just no ABS and I have changed the brakes a couple times without any issues. I admit I am not the most knowledgeable car repair person so I not sure what a tone ring is but I can have the mechanic that has it now check it when he tears the rest of it down to change the fuel pump. My neighbor and i changed the brakes and bled them not long ago and he said the one abs sensor wasnt plugged in and he did plug it in but the abs system wasnt even working due to the pump and motor that i took the fuse out. I was told it would cost alot to put a new abs and honestly i think the truck brakes lasted alot longer without the abs. I am not thrilled with abs brake systems at all way they make you feel you are going to wreck and do not have contril to me

            #852350
            EricTheCarGuy 1EricTheCarGuy
            Keymaster

              You may think you’ve disabled the ABS but what you describe sounds like an ailing ABS sensor sending false readings. It could also be a dirty or damaged tone ring. Based on your description, it sounds to me like an ABS issue. More info here.

              http://www.ericthecarguy.com/faq/solving-brake-problems

              Please keep us updated on what you find.

              #853613
              Mike LydenMike Lyden
              Participant

                Still am having issues withe the truck as far as the brakes. It is defintiely coming from the passenger side wheel area. have had tire off and the rotors are new and so are the pads and everything there. Is it possible that something like a tie rod or even front axle could be bent even? I would think though if that was the issue it would do something like that all the time. It only makes this thudding noise as if one side of the tire is flat and the rest is perfectly round. THe truck stops fine and slows down too but when you hit the brake pedal it still does that.. the abs light is on as is the brake and engine light but all three have been on since i pulled the fuse for the abs control module. A tthe time it went bad the price for a new one was almost 1000 for it my mechanic said but i seen one at autozone that was 259 99. If i got a new one is it hard to change. I would not know what all would have to do to change it. Can you just switch that out and plug it all back in and put fuse in and all is good or does anything like brakes need to be adjusted somehow. I have never messed with the ABS system and still not sure what the tone rings are

                #853625
                Nightflyr *Richard Kirshy
                Participant

                  Might look here for the module
                  http://www.carid.com/2001-gmc-sonoma-brake-parts/a1-cardone-abs-control-module-82183979.html

                  As to where to look for the tone ring:
                  Appears yours in on the CV axle

                  Also inspect the ABS wheel sensor.

                  A more complete description of your vehicle would be helpful.
                  2WD / 4WD, engine, transmission.

                  BTW you have CEL and ABS warning
                  Might get those checked with a scanner to see what exactly they are.

                  Attachments:
                  #853647
                  Mike LydenMike Lyden
                  Participant

                    Well that would explain my thoughts on the axle I was talking about. That is where i suspected it. THe tone rings are on the ball part on the end then of the CV axle. THe sensor was somehow umplugged and plugged it back in but it still does it. THe ABS< Engine and the brake lights have bene on for 5 yrs tho when i disconnected the ABS module. I am thinking I may need to replace the CV axle. I searched tone rings for parts and it dont have listed. CV axle is tho so is it possible that on this truck which is a 2001 GMC Sonoma 4×4 with a 4.3L V6 Engine VOrtec , the cv axle and tone rings is one unit that you have to replace all together?

                    #853648
                    Mike LydenMike Lyden
                    Participant

                      I would problaby need to replace the ABS module the abs sensor and the cv axle if cant get just the tone rings unless that is something the dealership would have to ge which is more expensive im sure

                      #853651
                      Nightflyr *Richard Kirshy
                      Participant

                        I believe the tone ring is part of the CV axle assembly on your vehicle, so it may not be serviceable.
                        But if the ring is intact and shows no signs of wear or damage and the axle is good working order..no reason to replace it.

                        If the sensor is still functional is another thing.

                        You seem to know that the ABS module is bad, if in fact it is not functioning.
                        I might start there.

                        #853653
                        MikeMike
                        Participant

                          Bit of a left field suggestion here.

                          I once diagnosed a similar Sonoma, it turned out that the vacuum line connection at the power brake booster was barely hanging on, and the clamp was cocked and loose. Depending on how the engine was torqued over on its mounts, a small vacuum leak developed at the booster connection which caused weird sensations at the brake pedal. Everything worked fine after the vacuum line was properly seated and the clamp installed properly.

                          #853712
                          Mike LydenMike Lyden
                          Participant

                            It is true the ABS module is bad but it has been disconnect by pulling the big fuse it mad a humming hiss noise from it and i never had anyissues with the brakes till this. WHen you are driving down the road and you apply the brake pedal it makes a rub and thump almost and the way it feels in the pedal if you think about it how i am trying to explain it now that i see that picture you including the the cv axle it could be as that part turns where tone rings are some thing is wrong at least perhaps even with that axle. Here in ohio lots pot holes i hit when it started doing it maybe bend some parts even. My neighbor said it maybe the cv axle unit also. It only does this on the passenger side and you can feel it and so can a passenger on that side. WHen you slow down and come to a stop it as if you are riding on like a round solid ball like a basketball that is completely solid lets say. But one side of it is flat and the rest is round. THus when your are slowing down it thuds on one side like it seems like it riding on a flat part then get on the round for 3/4 of the turn of it. The other odd symptom is that it only does this when you apply the brake pedal and slow down. While driving it is fine. Again the rotors brakes and calipers have been recentlly replaced and all lines bled. I am leaning myself to the cv axle just needs replaced. ARe there bearings in there too? maybe if so they are bad and casuing the thump and all that

                            #853721
                            Nightflyr *Richard Kirshy
                            Participant

                              There are a couple of variants, but typical CV axles look like this.

                              Only way to know, would be to go in and do a complete inspection of the axle and its operation.
                              Might consider mounting a GoPro or other type camera to video the wheel in motion during braking to see what is actually happening.

                              #853734
                              Mike LydenMike Lyden
                              Participant

                                Thank you evil-i it wouldnt surprise me at this point if it was both the cv axle and a vaccum line. I have replaced some vaccum lines under hood that have rotted and fallen apart. ANother actual issue is with the heater controls it only only defrost but blows out the vents too which right now is ok since it still heats up the truck and defrosts it well. HOwever i know one of the actuators is bad and it could be just a vaccum line there i read too. engine code has read there a vaccum leak wish it said where exaclty at somehow.

                                #853735
                                Nightflyr *Richard Kirshy
                                Participant

                                  Gotta pay your dues..
                                  Diagnostic computers can only tell you so much, the rest is up to you.

                                  #853736
                                  Mike LydenMike Lyden
                                  Participant

                                    Going off the pictures here and my suspicions I have it could be, I would think that the race, cage and balls is like a ball bearing and it is bad on that side. THe tone rings must be the ABS sensor rotor listed on the 3rd picture and could also be that. I have called and they said you have buy the whole unit to replace and it just as well as one complete thing.

                                  Viewing 15 replies - 1 through 15 (of 15 total)
                                  • You must be logged in to reply to this topic.
                                  Loading…
                                  toto slot toto togel situs toto situs toto https://www.kimiafarmabali.com/
                                  situs toto situs toto