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rough idleing on ford 3.8 liter

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  • #453384
    jhaggadonejhaggadone
    Participant

      ok so i just bought a 1997 cougar (3.8 liter V6) for $500 only check engine light code that popped up was a cylinder #2 misfire. replaced wheel bearing, air n fuel filter, spark plugs n wires, and did an oil change on it. runs nice and shifts smooth but at stand still in R and D idles rough even shakes car a lil ive searched forums and it seams this motor in multiple cars have had similar issues but have a whole lot of different things to run thru just trying to put in my own forum to see what hear from of my own sources so any ideas would help greatly thank you

    Viewing 15 replies - 1 through 15 (of 24 total)
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    • #453385
      EricTheCarGuy 1EricTheCarGuy
      Keymaster

        Step 1 for me would be to do a power balance test to see if you can nail down the effected cylinder(s). I know you say you got a code for cylinder #2 but in my experience it’s still worth going back and checking to verify that it’s actually cylinder #2 that is the problem as I’ve seen more than one occasion where that wasn’t the case and it was another cylinder that as a problem. Here’s a link to a video that I did on this.

        http://www.youtube.com/watch?v=bAOmUjAjNjE

        Once you find the effected cylinder(s) the next step is to find out the cause of the misfire, is it spark, fuel, or engine mechanical that’s the cause? Through a process of elimination you will find the cause and then be able to come up with a repair but first do the power balance and see what you’ve got and we’ll go from there.

        #453386
        jhaggadonejhaggadone
        Participant

          Quoted From EricTheCarGuy:

          Step 1 for me would be to do a power balance test to see if you can nail down the effected cylinder(s). I know you say you got a code for cylinder #2 but in my experience it’s still worth going back and checking to verify that it’s actually cylinder #2 that is the problem as I’ve seen more than one occasion where that wasn’t the case and it was another cylinder that as a problem. Here’s a link to a video that I did on this.

          http://www.youtube.com/watch?v=bAOmUjAjNjE

          Once you find the effected cylinder(s) the next step is to find out the cause of the misfire, is it spark, fuel, or engine mechanical that’s the cause? Through a process of elimination you will find the cause and then be able to come up with a repair but first do the power balance and see what you’ve got and we’ll go from there.

          well when i replace the off brand wires they had which look farely new and plugs i havent had the misfire code pop back up and the motor has alot more power so i think i got past that part now its just my P0430 code popping up and it still has the rough idle tomm imma try the carb cleaner vacuum test and after that imma check for a inferred thremoter so i can check the cats so i will check back in once i get to that piont

          #453387
          EndSupremacyEndSupremacy
          Participant

            Check the following:

            Use of incorrect grade of fuel
            Oil contamination
            Fuel Pressure too high
            Heated Oxygen Sensor improperly connected
            Damaged exhaust system component
            Faulty ECT sensor
            Faulty Heated Oxygen sensor (check this last).

            If you check all of these and they’re good or they;re not and you fix them, then put your scanner back on and clear the codes. If the codes come back (doesn’t have to come back immediately, sometimes it will come back a day or 2 later), clear it again and disconnect the battery for 30 mins. Then reconnect it and start it up. You should be code free from then on.

            #453388
            jhaggadonejhaggadone
            Participant

              Quoted From EndSupremacy:

              Check the following:

              Use of incorrect grade of fuel
              Oil contamination
              Fuel Pressure too high
              Heated Oxygen Sensor improperly connected
              Damaged exhaust system component
              Faulty ECT sensor
              Faulty Heated Oxygen sensor (check this last).

              If you check all of these and they’re good or they;re not and you fix them, then put your scanner back on and clear the codes. If the codes come back (doesn’t have to come back immediately, sometimes it will come back a day or 2 later), clear it again and disconnect the battery for 30 mins. Then reconnect it and start it up. You should be code free from then on.

              how do i check for oil contamination?

              #453389
              EndSupremacyEndSupremacy
              Participant

                Usually you can check with the dipstick. Usually…it’s not always the case. Also, you can drain the oil.

                #453390
                EricTheCarGuy 1EricTheCarGuy
                Keymaster

                  Normally it’s just a visual inspection but to be honest that’s kind of at the bottom of the list in my opinion for a rough idle misfire issue, I’d be focusing on vacuum leaks, voltage leaks, or fuel pressure issues.

                  #453391
                  fordrangerfordranger
                  Participant

                    but what if theres no lights? if theres a vacuum problem wouldn’t their be a check engine light for lean????

                    #453392
                    dreamer2355dreamer2355
                    Participant

                      Quoted From fordranger:

                      but what if theres no lights? if theres a vacuum problem wouldn’t their be a check engine light for lean????

                      It depends on the severity of the vacuum leak.

                      Not all lean codes are directly related to vacuum leaks either. This is where scan tool data comes into play.

                      #453393
                      fordrangerfordranger
                      Participant

                        huh never knew that you’d think that engines are sensitive and that any leak at all would lean code it. i learned something new thanks i was think of an old method of a smoke test by using cigar smoke as a form of testing has anybody used it this way? and if so is it a reliable diagnostic tool?.

                        #453394
                        EricTheCarGuy 1EricTheCarGuy
                        Keymaster

                          I’ve never tried it but it should work in principal, I’ve made videos of how I do the test along with tests for voltage leaks.

                          http://www.youtube.com/watch?v=9CPqbaSgcok

                          http://www.youtube.com/watch?v=x-U9WqJfaJs

                          #453395
                          fordrangerfordranger
                          Participant

                            hey eric my question is on my coil pack (ford ranger) they have clips that need to be push together for the wire to come out and the coils casing is plastic how would i test that if its all surrounded would it make a difference?

                            #453396
                            dreamer2355dreamer2355
                            Participant

                              If you asking how to test your ignition coil, you need to stress test it under a load with an adjustable ignition tester, obviously with ignition wires going to the coils.

                              #453397
                              fordrangerfordranger
                              Participant

                                yeah but if in theory if t was my coil pack being bad wouldn’t it have an actually misfire? that a check engine light would show up on the dash. theres no light so not bad coil and if in theory if there was a voltage leak which doesn’t make sense to me because if i was bwd wires and the coil pack doesn’t have any rust or burnt on the coil itself. im thinking my problem is more of a vacuum leak itself but a slight on. because if it was a mechanical issue itd be missing which its not and the ignition doesn’t arc or leak. does anybody know it its normal for an alternator to send a like at 5k when in passing or in neutral. my belt does have 80k and squeals when its damp out.

                                #453398
                                MattMatt
                                Participant

                                  Quoted From fordranger:

                                  yeah but if in theory if t was my coil pack being bad wouldn’t it have an actually misfire? that a check engine light would show up on the dash. theres no light so not bad coil and if in theory if there was a voltage leak which doesn’t make sense to me because if i was bwd wires and the coil pack doesn’t have any rust or burnt on the coil itself. im thinking my problem is more of a vacuum leak itself but a slight on. because if it was a mechanical issue itd be missing which its not and the ignition doesn’t arc or leak. does anybody know it its normal for an alternator to send a like at 5k when in passing or in neutral. my belt does have 80k and squeals when its damp out.

                                  I think you should start your own post as to what problems you are having with your vehicle. See the newly stickied post by Spelunkerd as to how to post what’s going on, and you should find some good help.

                                  #453399
                                  dreamer2355dreamer2355
                                  Participant

                                    Quoted From fordranger:

                                    yeah but if in theory if t was my coil pack being bad wouldn’t it have an actually misfire? that a check engine light would show up on the dash. theres no light so not bad coil and if in theory if there was a voltage leak which doesn’t make sense to me because if i was bwd wires and the coil pack doesn’t have any rust or burnt on the coil itself. im thinking my problem is more of a vacuum leak itself but a slight on. because if it was a mechanical issue itd be missing which its not and the ignition doesn’t arc or leak. does anybody know it its normal for an alternator to send a like at 5k when in passing or in neutral. my belt does have 80k and squeals when its damp out.

                                    Faulty coils will not always show as a misfire. That’s why it is best to stress test them under a load.

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