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  • smoking 3.4L engine after highway run

    Hi Guys,
    I've just picked up a 3.4L 210,000 km 90 series, and found around town it doesn't smoke at all, but after a highway speed drive of over 30 mins, it will blow a large volume of white smoke at the next start. The smoke disappears after a couple of minutes and behaves itself unless another high speed drive comes along. The plugs are quite oily, and I suspect they have been in far too long.

    Other than changing the plugs, any thoughts ?

    Thanks,
    Simon
    Adelgigs
    Lurker
    Last edited by Adelgigs; 28-11-2013, 10:31 PM.
    2010 Prado 150

  • #2
    Is it running LPG ??? Cheers Steve
    Face lift 150 Prado V6 auto. No mods yet

    Comment


    • #3
      No, standard ULP.
      2010 Prado 150

      Comment


      • #4
        Hi simon i was wondering if you worked out what caused the smoke my prado does the same

        Hi simon i was wondering if you worked out what caused the smoke my prado does the same and it has 210 on the clock too

        Thanks
        Craig

        QUOTE=Adelgigs;443909]Hi Guy
        I've just picked up a 3.4L 210,000 km 95 series, and found around town it doesn't smoke at all, but after a highway speed drive of over 30 mins, it will blow a large volume of white smoke at the next start. The smoke disappears after a couple of minutes and behaves itself unless another high speed drive comes along. The plugs are quite oily, and I suspect they have been in far too long.

        Other than changing the plugs, any thoughts ?

        Thanks,
        Simon[/QUOTE]

        Comment


        • #5
          Quick test would be to start the engine and pull the engine oil cap off. If there's heaps of smoke / vapor coming out of the rocker cover you may find that the engine may be a bit tried. If there's bugger all fumes coming out, then it might just have the wrong viscosity of oil in it.
          96 3.4 GXL, 2" lift, Poly airs in rear, 32" BFG muddies, Lightforce 170's HID's, TJM rack, Awning, Twine on board shower, GME uhf, Dual batteries & monitor, Storage system, ARB fridge, LED rear lighting, Safari snorkel, Brown Davis bash plate, Ironman winch bar, Runva 11xp winch, Roadsafe recovery points, ARB compressor, Tyre dog monitor, AJ's sliders, Hema hn6. The to do list is getting shorter.

          Comment


          • #6
            Originally posted by shawie View Post
            Hi simon i was wondering if you worked out what caused the smoke my prado does the same and it has 210 on the clock too
            Doing a short road trip this weekend to Saunders Gorge, so will let you know what happens. I've got a new set of plugs to put in before I go. Very odd that your Prado does the same thing, but doing a search it doesn't seem to have been mentioned before.

            Thanks for the comments.

            Cheers,
            Simon
            2010 Prado 150

            Comment


            • #7
              Valve stem seals perhaps? Compression test should tell you if the engine's tired and if the oil is coming up past the rings.

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              • #8
                If it was vavle stem seals it would blow smoke after having the engine idle for a bit, rather then only high speeds. Would def get comp test on engine done. Just for piece of mind.
                96 3.4 GXL, 2" lift, Poly airs in rear, 32" BFG muddies, Lightforce 170's HID's, TJM rack, Awning, Twine on board shower, GME uhf, Dual batteries & monitor, Storage system, ARB fridge, LED rear lighting, Safari snorkel, Brown Davis bash plate, Ironman winch bar, Runva 11xp winch, Roadsafe recovery points, ARB compressor, Tyre dog monitor, AJ's sliders, Hema hn6. The to do list is getting shorter.

                Comment


                • #9
                  When I say it blows smoke at start-up after a decent run, I mean an absolute cloud of white-ish smoke.

                  I have just pulled the plugs and I reckon they have been in there for way too long, in fact I would hate the think how long. The centre electrode is about a third in diameter of a new plug, and the two "arms" are markedly burnt back. I'll also run a heap of injector cleaner through it.

                  Perhaps a cause, or just a cause of lousey economy with a weak spark ? It didn't seem to lack any power though.

                  The weekend run will soon tell.
                  2010 Prado 150

                  Comment


                  • #10
                    Does the white smoke smell like raw fuel then?

                    Comment


                    • #11
                      Originally posted by Adelgigs View Post
                      Hi Guys,
                      I've just picked up a 3.4L 210,000 km 95 series, and found around town it doesn't smoke at all, but after a highway speed drive of over 30 mins, it will blow a large volume of white smoke at the next start. The smoke disappears after a couple of minutes and behaves itself unless another high speed drive comes along. The plugs are quite oily, and I suspect they have been in far too long.

                      Other than changing the plugs, any thoughts ?

                      Thanks,
                      Simon
                      White smoke is not oil, it is fuel. Blue/grey smoke is oil. You may have worn/dirty injectors
                      97 VX Grande, with front & rear air lockers, ARB Sahara winch bar with tigers 11 winch, 2" EFS lift, 265/75/16 Achilles Desert hawk XMT, and more.


                      [B]Bitumen - A blatant waste of taxpayers money![/B]

                      Comment


                      • #12
                        It might be worth trying some of the "Cost Effective Maintenance (CEM) Products. I've heard some very good reports and if it solves your issue, then u have saved some $$
                        [I]cheers..... Rob (macca)[/I]
                        [I][B][COLOR=DarkRed]Car-4: 1996 Defender Tdi [/COLOR][/B][/I]
                        [I][B][COLOR=Blue]Car-3: 1996 Discovery Tdi Auto[/COLOR][/B][/I]
                        [B][I][COLOR=Green]Car-2: 1993 Suzuki Vitara 4Dr (modified for Playing) [/COLOR][COLOR=#ff0000]Now Retired[/COLOR][COLOR=Green] [/COLOR][/I][/B]
                        [B][I][COLOR=DarkOrchid]Car-1: 2010 Toyota Prado 150's (Missus Car/current touring vehicle)[/COLOR][/I][/B]

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                        • #13
                          WHOA! Do not do/buy/fix anything yet!
                          Some sage advice that was fortunately beaten into me by my mechanic mate fairly early: DON'T START FIXING ANYTHING UNTIL YOU DIAGNOSE EXACTLY WHAT THE PROBLEM IS! Anyone who has worked on cars for a while will have a tale of all the money they spent chasing a fault and ending up at the tail light when the fault was in the radiator!
                          Do simple and complete overall diagnosis stuff first.
                          For example: you said the plugs were "oily", is that on the exterior or on the business end? Are they "oily" or "wet" (with fuel)?
                          Does the engine oil get dirty real quick? (Blow by past rings, can check with compression test which will also give you an idea of the general state of the engine) Does it use much oil? etc etc.. you get my drift? Make sure you post accurate symptoms so we avoid having to make wild guesses as to what it MIGHT be (not berating you in any way OK?) Accuracy is important, coz at the moment I am not sure whether to advise you to look at rings or injectors and you could waste $$$$ if you get pointed in the wrong direction.
                          The most I might do at this stage is run some injector cleaner through it for the princely sum of about ten bucks ( and change the plugs obviously) but don't throw money at it until you know what is really happening. cheers Steve

                          Comment


                          • #14
                            Originally posted by t303 View Post
                            WHOA! Do not do/buy/fix anything yet!
                            Some sage advice that was fortunately beaten into me by my mechanic mate fairly early: DON'T START FIXING ANYTHING UNTIL YOU DIAGNOSE EXACTLY WHAT THE PROBLEM IS! Anyone who has worked on cars for a while will have a tale of all the money they spent chasing a fault and ending up at the tail light when the fault was in the radiator!
                            Do simple and complete overall diagnosis stuff first.
                            For example: you said the plugs were "oily", is that on the exterior or on the business end? Are they "oily" or "wet" (with fuel)?
                            Does the engine oil get dirty real quick? (Blow by past rings, can check with compression test which will also give you an idea of the general state of the engine) Does it use much oil? etc etc.. you get my drift? Make sure you post accurate symptoms so we avoid having to make wild guesses as to what it MIGHT be (not berating you in any way OK?) Accuracy is important, coz at the moment I am not sure whether to advise you to look at rings or injectors and you could waste $$$$ if you get pointed in the wrong direction.
                            The most I might do at this stage is run some injector cleaner through it for the princely sum of about ten bucks ( and change the plugs obviously) but don't throw money at it until you know what is really happening. cheers Steve
                            If you run injector cleaner through it, it wont fix the problem for many tank fulls, it would be cheaper and give you a better idea of the condition of the injectors if you got them cleaned ultrasonically.
                            97 VX Grande, with front & rear air lockers, ARB Sahara winch bar with tigers 11 winch, 2" EFS lift, 265/75/16 Achilles Desert hawk XMT, and more.


                            [B]Bitumen - A blatant waste of taxpayers money![/B]

                            Comment


                            • #15
                              You can do a Ramflo on the injectors for about $150 approx. Still not as good as pulling out and having them checked and tested.....Cheers Steve
                              Face lift 150 Prado V6 auto. No mods yet

                              Comment

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