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1990 integra rough idle at 750, smooth at 1000rpm

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  • November 25, 2013 at 8:44 pm #564973
    Dave GarbocziDave Garboczi
    Participant

      When I am waiting at a light the tach shows 750rpm and the whole car shakes. As soon as I pull away and the rpm goes up, the engine is smooth. This happens even if I shift to N and raise the rpm, engine smooths out at higher rpm. What I’ve done (in general, not to address this issue): plugs, wires, no coolant leaks, (holds 13lbs pressure for 30 min.) I haven’t changed the dist cap and rotor, but they are on my list. I haven’t tried to adjust the valves. Does anyone have some suggestions? thanks, Dave

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    • November 25, 2013 at 8:52 pm #564978
      BillBill
      Participant

        Make sure all of the engine and transmission mounts are in good condition and that the exhaust system isn’t touching the body or suspension. If any of these problems exist the normal pulsations of the engine will be transferred to the seat of your pants.

        November 25, 2013 at 9:17 pm #564983
        Dave GarbocziDave Garboczi
        Participant

          I recently changed all the mounts, because they were terrible. Exhaust is not touching body or suspension. Rear suspension needs work. Maybe the car vibrates so much because the rear suspension is worn out.

          November 25, 2013 at 10:58 pm #565001
          BillBill
          Participant

            Did you have the vibration before you changed the mounts? If not I suggest you go over your work. You could try loosening the mount bolts to the frame and tightening them again. sometimes they get bound up if not tightened in the correct position.

            November 26, 2013 at 1:20 am #565018
            george gonzalezgeorge gonzalez
            Participant

              You might have a weak cylinder. Try Eric’s power balance test, where you pull off a spark plug wire one at a time. If pulling off a wire doesn’t make much difference, then that cylinder probably is weak. Probably low compression. It could be a spark problem but you replaced the usual suspecs there.

              November 26, 2013 at 2:17 am #565022
              college mancollege man
              Moderator

                Here is a link on performance and idle issues.

                http://www.ericthecarguy.com/faq/solving-automotive-idle-problems

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

                November 26, 2013 at 4:00 am #565052
                EricTheCarGuy 1EricTheCarGuy
                Keymaster

                  [quote=”college man” post=80286]Here is a link on performance and idle issues.

                  http://www.ericthecarguy.com/faq/solving-automotive-idle-problems

                  http://www.ericthecarguy.com/faq/solving-automotive-performance-issues%5B/quote%5D

                  I can be even more specific than College man here as I’ve written an article specifically on Honda rough idle issues.

                  Solving Honda Idle Issues, Rough Idle

                  November 26, 2013 at 7:45 am #565109
                  BryanBryan
                  Participant

                    Wow! Is honda that bad on idle vibrations? I never knew. Id figure thered be a tsb on motor mounts…shims for the fix or something like that….gm had that on 2.2 ecotechs

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