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1985 s10 tahoe 2,8l 4×4 problems

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  • November 4, 2015 at 3:02 pm #843663
    jasonjason
    Participant

      hi everyone i have a couple of questions for my s10 tahoe i have been having lots of problems with it here lately its been acting up a lot when i start from a dead stop and accelerate it back fires and seems like all power is cut out for a second and jerks hard front to back also i switched from reg motor oil to synthetic and it seems like i lost a lot of up hill power. and when i down shift the trans it sounds like gears are rubbing. it is my project truck any ideas????

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    • November 9, 2015 at 10:15 pm #844161
      dandan
      Moderator

        i have moved this to service and repair questions answered here so people can better help you out.

        sounds almost like a fuel issue but i don’t know… backfiring typically happens when you have a timing issue or when you are running really rich and the exhaust gasses have a lot of unburned gasoline in them and it backfires as a result…

        November 10, 2015 at 3:51 am #844192
        CharlesCharles
        Participant

          Could be lots of things. Does it idle smooth? Does it run OK at higher speed? Any obvious vacuum leaks?

          Fuel Injection or Carburetor?

          November 10, 2015 at 11:22 am #844217
          jasonjason
          Participant

            Me and my grandfather went and fixed all the bad vacuum hoses we had to disconnect the throttle position sensor because it would idle at 2,000 rpm and when we disconnected the wire connections off of it. It idled at 800 rpm steadily. And it has a Carburetor

            November 12, 2015 at 8:38 am #844342
            dandan
            Moderator

              could have been a lean condition if that fixed it?

              November 13, 2015 at 12:57 pm #844434
              Wyr TwisterWyr Twister
              Participant

                You disconnected the wire / connector from the TPS ? That is when the backfiring started ? Then put a new TPS on the engine .

                God bless
                Wyr

                November 13, 2015 at 8:59 pm #844462
                EricTheCarGuy 1EricTheCarGuy
                Keymaster

                  Is your CEL on? If so, pull the codes to see what you have. You won’t be able to use an OBDII scanner for this even though the port looks similar. You may have to resort to other means.

                  http://www.gmtuners.com/OBD1_DTC.htm

                  You might also find this helpful.

                  http://www.ericthecarguy.com/faq/solving-automotive-performance-issues

                  Please keep us updated on your progress.

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