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Acura TL 06 Rough Idle Problem

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  • #443211
    jcasti1226jcasti1226
    Participant

      I have an Acura TL 2006 Nav, with 3.2L V6 Engine , it has 43k miles on it and all services done on time, it’s still under warrantee, it has been driven carefully, used premium fuel from Mobil all the time and has had one driver.

      Lately I’m feeling engine vibrations at idle to the point where you feel it on the steering wheel and head rest and every 10 to 20 seconds to what it seems as misfire and no check engine light. Al though the engine maintains a good constant idle speed of aprox. 650 rpm without load.

      This car has had the same spark plugs since I got it(new), so I decided to replace them for the same ones ( Band and Model). I notice on Cylinder 4 liquid oil on the spark plug treads and a black crusty gunk on the bottom of the spark plug of cylinder 5, the rest of them came out clean with normal wear and tear. With the new spark plugs the car acceleration improved significantly but still the rough idle remained and the misfire every 10 to 20 seconds.

      After I week I decided to take the car to Acura and explain my findings and complain about rough idle.

      This were the actions taken by Acura:

      • Check Engine Mounts
      • Computer Diagnostics on the engine.
      • Look at the old spark plugs, check the new ones and ignition coils plugs.
      • Fuel Rail Cleaning (justice brothers emission system cleaner)
      • Engine Idle Reset and Relearn.

      Acura couldn’t find anything wrong with the engine and told me the rough idle, oil on the spark plug treads, and the black crusty gunk on the spark plug on cylinder 5 is at acceptable Acura Limit. I wasn’t ‘t satisfied and decided to take the car to a second Acura service center and ended up with the same results.

      I know by hard there’s has to be something wrong, I have compared many Honda V6 cars with the J series engine including a friend’s Honda Accord 2004 with 142k miles and it’s so smooth at idle you don’t think it’s the engine is on.

      I would appreciate if any one can shed some light on this.

      Regards,
      Juan

    Viewing 9 replies - 1 through 9 (of 9 total)
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    • #443213
      dreamer2355dreamer2355
      Participant

        Welcome to the forums!

        You may want to post your question in the service and repair section.

        However, here is some video’s by Eric that may help you –

        Power balance test –

        http://www.youtube.com/watch?v=bAOmUjAj … yyMYSZRIOn

        Leakdown test –

        http://www.youtube.com/watch?v=WgrfT0LF … 99HlbSvyqQ

        Finding a vacuum leak –

        http://www.youtube.com/watch?v=9CPqbaSg … t3EVppbf88

        ETCG Idle speech –

        http://www.ericthecarguy.com/forum/topics.aspx?ID=1134

        #443214
        jcasti1226jcasti1226
        Participant

          Quoted From dreamer2355:

          Welcome to the forums!

          You may want to post your question in the service and repair section.

          However, here is some video’s by Eric that may help you –

          Power balance test –

          http://www.youtube.com/watch?v=bAOmUjAj … yyMYSZRIOn

          Leakdown test –

          http://www.youtube.com/watch?v=WgrfT0LF … 99HlbSvyqQ

          Finding a vacuum leak –

          http://www.youtube.com/watch?v=9CPqbaSg … t3EVppbf88

          ETCG Idle speech –

          http://www.ericthecarguy.com/forum/topics.aspx?ID=1134

          Thanks i will post it on the service and repair forum.

          #443215
          dreamer2355dreamer2355
          Participant

            Did you follow any of Eric’s video’s i posted in your other thread for this exact same question?

            #443212
            jcasti1226jcasti1226
            Participant

              I have an Acura TL 2006 Nav, with 3.2L V6 Engine , it has 43k miles on it and all services done on time, it’s still under warrantee, it has been driven carefully, used premium fuel from Mobil all the time and has had one driver.

              Lately I’m feeling engine vibrations at idle to the point where you feel it on the steering wheel and head rest and every 10 to 20 seconds to what it seems as misfire and no check engine light. Al though the engine maintains a good constant idle speed of aprox. 650 rpm without load.

              This car has had the same spark plugs since I got it(new), so I decided to replace them for the same ones ( Band and Model). I notice on Cylinder 4 liquid oil on the spark plug treads and a black crusty gunk on the bottom of the spark plug of cylinder 5, the rest of them came out clean with normal wear and tear. With the new spark plugs the car acceleration improved significantly but still the rough idle remained and the misfire every 10 to 20 seconds.

              After I week I decided to take the car to Acura and explain my findings and complain about rough idle.

              This were the actions taken by Acura:

              • Check Engine Mounts
              • Computer Diagnostics on the engine.
              • Look at the old spark plugs, check the new ones and ignition coils plugs.
              • Fuel Rail Cleaning (justice brothers emission system cleaner)
              • Engine Idle Reset and Relearn.

              Acura couldn’t find anything wrong with the engine and told me the rough idle, oil on the spark plug treads, and the black crusty gunk on the spark plug on cylinder 5 is at acceptable Acura Limit. I wasn’t ‘t satisfied and decided to take the car to a second Acura service center and ended up with the same results.

              I know by hard there’s has to be something wrong, I have compared many Honda V6 cars with the J series engine including a friend’s Honda Accord 2004 with 142k miles and it’s so smooth at idle you don’t think it’s the engine is on.

              I would appreciate if any one can shed some light on this.

              Regards,
              Juan

              #443216
              jcasti1226jcasti1226
              Participant

                Quoted From dreamer2355:

                Did you follow any of Eric’s video’s i posted in your other thread for this exact same question?

                I did follow the videos and requested compresion , leak down and power balance diagnostic in all Acura refused to do beucase they said the car is running like new. I spoke to the dealer’s master tech and ended up with the same results.

                For some reaseon they don’t want to work.

                #443217
                EricTheCarGuy 1EricTheCarGuy
                Keymaster

                  Hey I’m an Acura master tech too! I would say it’s BS that the oil in the plug wells is normal because that would indicate a leak. When oil gets onto the plug boot it can degrade the insulation which could cause a misfire on that cylinder. I know you said you did a power balance test but what did the engine do when you got to that plug?

                  Also that year TL had a power steering hose recall which required that you unhook the rear engine mount to install the new part, if this was done incorrectly the rear mount could have been damaged during that process possibly causing your condition. Acura uses liquid filled vacuum controlled engine mounts on that car so sometimes you can visually inspect them for fluid on the outside, if you see that then the mount is bad and should be replaced, also check for a damaged or disconnected vacuum line.

                  I suspect since your car is still under warranty that the dealer didn’t want to address anything at this time because warranty work does not pay the same as customer pay work. You might want to call the Acura hotline and explain your experience to them and they will light a fire under the dealer you are working with and perhaps they will get off their butts and address the issue instead of kicking it down the road till it becomes a customer pay job.

                  #846527
                  richard ambrosinorichard ambrosino
                  Participant

                    2005 acura tl. During timing belt/water pump replacement bent valve in #1 cyl. Removed head and had shop replace #1 valves and check and reseat rest. Reassembled. Engine idles rough especially at cold idle. Smooths out when car is warmed up and driven a while. Idle speed does not flucuate at cold or warm idle speed. I feel vibration in steering wheel and seat. No mil light. During assy I knocked over the front engine mount and a small amount of oil leaked out. What is causing this idle problem? I also replaced the plugs not with recommended brand.

                    #846575
                    Andrew HarrisAndrew Harris
                    Participant

                      First thing that comes to mind is Valve timing. you said the head was off. possible that someone didn’t set up the timing belt correctly. Another thing that comes to mind is Valve lash adjusted to tight. Last thought the intake manifold had to have come off on this vehicle to remove heads. Possibly the top cover on the manifold has a gasket. it is possible to put it on backwards messing with the egr operation. Did this one to myself before. drove me made.

                      Final thought- you might get more response if you started your own thread and not hijacked this one. don’t take that personal. just trying to help.

                      #889272
                      AnthonyAnthony
                      Participant

                        if you don’t have NGK plugs in your car it will act as if it has the Flu. I tried to go cheap once with the Busch double platinum which was still costly and unreturnable after putting them in. so $32 later. I had to go spend the 9 something a plug. for the NGK Iridium spark plugs which are stock OEM plugs for these cars.
                        When I had the Busch plugs in it would backfire if I hid the gas too hard. the dumbest thing I could have done was go cheap on a car that calls for every other expensive thing for them. gas, oil, trans fluid also, don’t care what Honda says go with redline ATF. it much better. and withstand more heat if you drive like I do.
                        sorry for the Rant… just had to say. dont put nothing but NGK plugs in your Vtec motors

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