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  • It's a turbocharged engine, how is a snorkel going to do anything? You may get a "ram" effect with a naturally aspirated engine, but not on a 2.8 TD prado engine.
    1979 BJ40
    1992 FZJ80R
    1997 HDJ80R
    2005 GRJ120R

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    • My thoughts as well but too polite to mention them, as for making it "run richer"! whoops sorry I have said it now.

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      • I'm guessing some of you have never seen where the oem intake takes its air from? It's in between the firewall and body next to the wheel arch. If you think that the air is cooler and cleaner from there then I don't know what to tell you.

        Im not saying there is a huge difference but there would be a small one.

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        • I have recorded a regeneration while mainly travelling at around 100Kms/hr on the freeway.
          I know that cuda who originally started this thread is going to do the same once his car has reached 100%, he has an auto so it will be interesting to see if there is any difference.
          One screen shot shows main and after timing, and DPF temperature set against the soot %
          You can see that once 100% is reached the timing is retarded but it seems that after the soot falls back to 98% the main timing is restored to more or less what is was before the regeneration.
          Another screen shot shows the 5th injector on/off, this is "on" nowhere near as much as I had previously expected.
          The last screen shot shows the injection volume which is higher even when the timing seems restored to normal. Unfortunately the last third of these graphs were in mixed driving having left the freeway so are pretty meaningless apart from the very end where the car was left running at fast idle 1200 rpm as this is a manual, you can see the B1S2 temperature climb even more.
          If anyone can interpret the graphs better than me or would like any other parameters uploaded please just say. This was taken from a recording of all engine data list parameters which slows down the rate but I didn't want to miss anything.

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          • Just had the DPF replaced on 2016 Gxl auto (20,000k), early days but the fuel economy has improved. The question is what is different from the old DPF to the new one, will it be the same issue in another 20,000ks

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            • Originally posted by prado R83D View Post
              I'm guessing some of you have never seen where the oem intake takes its air from? It's in between the firewall and body next to the wheel arch. If you think that the air is cooler and cleaner from there then I don't know what to tell you.

              Im not saying there is a huge difference but there would be a small one.
              A snorkle is literally just a raised air intake, if you're following a convoy blowing up dust on the road it's not going to make any difference where it is, the only advantage of a snorkle in that situation is that you could probably put a sock on it. As for cooler- perhaps, but I'm honestly dubious as to if it'd actually make a difference large enough to be measured in any qualtifiable way- our cars have intercoolers for that very reason.

              As for it "Ramming" air into the motor, that doesn't make sense on a turbocharged engine- The turbo is already punching air into the motor at ~12 psi (on the D4D anyway, not sure about the new ones), how is a "ram head" going to increase that pressure? As for running "richer"- It can't, aside from any other reason (and there are quite a few) the computer controls the air/ fuel mixture precisely to where it needs to be.

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              • Originally posted by JohnLynn View Post
                I have recorded a regeneration while mainly travelling at around 100Kms/hr on the freeway.
                I know that cuda who originally started this thread is going to do the same once his car has reached 100%, he has an auto so it will be interesting to see if there is any difference.
                One screen shot shows main and after timing, and DPF temperature set against the soot %
                You can see that once 100% is reached the timing is retarded but it seems that after the soot falls back to 98% the main timing is restored to more or less what is was before the regeneration.
                Another screen shot shows the 5th injector on/off, this is "on" nowhere near as much as I had previously expected.
                The last screen shot shows the injection volume which is higher even when the timing seems restored to normal. Unfortunately the last third of these graphs were in mixed driving having left the freeway so are pretty meaningless apart from the very end where the car was left running at fast idle 1200 rpm as this is a manual, you can see the B1S2 temperature climb even more.
                If anyone can interpret the graphs better than me or would like any other parameters uploaded please just say. This was taken from a recording of all engine data list parameters which slows down the rate but I didn't want to miss anything.
                Any chance of re-posting these in a larger size John, I'm squinting so hard I nearly pulled a muscle!
                Cheers
                Micheal.

                2008 GXL D4D Auto. GOING... GOING... GONE
                2015 GXL 1GD Auto. And it begins again...

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                • Sorry I didn't realise that the forum doesn't seem to allow the pictures to be magnified. I am pleased that someone is actually interested!!
                  I posted the same ones on the Fortuner forum here https://www.fortunerforum.com.au/for...dpf-myth/page6 and at least on my PC using Firefox they can be clicked on to enlarge to a sensible size to see them.
                  Please let me know if you can see them OK on the link if not I will upload them to a photo sharing website.
                  I would also like to know wtf is going on with the recalculation after a regeneration. After this burn my soot % quickly increased to 78% then fell almost in half before slowly increasing again. It behaves like this ever single time.
                  I don't think there is anything wrong with my Prado, it had covered nearly 400 Km between regens and they are over with quickly. It is just why this recalculation is done that is doing my head in. Especially as my dealer service manager says it doesn't happen.

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                  • Originally posted by JohnLynn View Post
                    Sorry I didn't realise that the forum doesn't seem to allow the pictures to be magnified. I am pleased that someone is actually interested!!
                    John, thanks for posting/linking to the other forum - I was going to ask you to post better images also but those are fine. Very interesting - it really is a complicated system, pit we have to have it.

                    Have you found a OBD code for when the car is doing a regen?

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                    • The 2138 pid posted by ExNissan shows the soot % which obviously goes down once a regen is happening, this combined with raised exhaust temperatures show that a genuine one is happening. This can be seen easily enough with scan gauge or torque pro, but is different to my observation that the % falls by roughly half without any increase in temperature, in other words a recalculation?
                      However on one of the graphs I have included the "DPNR/DPF rejuvenation status" which can be "standby" "ready" "operate" and "complete" you probably noticed that this does not move from standby before, during or after. Luke on the Fortuner forum has seen this change when a forced or manual burn is carried out so maybe that is what it is meant to show. I hoped by including it that someone would tell us.

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                      • My car is blowing white smoke again! First time at around 10,000km, now at 18,424km and 18,977km consecutively. The latest one was bad because instead of blowing it once it was doing it every time I push the pedal in the traffic. I'm about to drive to Uluru in April school holiday, how likely is it that I'll be stranded in the middle of nowhere? I've booked my car in on Thursday for the 20,000km service, I'll see what the dealer has to say.

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                        • Originally posted by sia535 View Post
                          My car is blowing white smoke again! First time at around 10,000km, now at 18,424km and 18,977km consecutively. The latest one was bad because instead of blowing it once it was doing it every time I push the pedal in the traffic. I'm about to drive to Uluru in April school holiday, how likely is it that I'll be stranded in the middle of nowhere? I've booked my car in on Thursday for the 20,000km service, I'll see what the dealer has to say.
                          Ah, yes. The reason I have just committed to purchasing another 4WD and took perhaps a $15K hit on it after less than two years. I just cannot trust it.

                          You most likely won't get a new DPF in time - they order them from Japan. However, what I did manage to confirm is that the DPF will have a limp-home mode so it shouldn't leave you fully stranded - and that if you disconnect the batteries for 30min after you shut it down (in the even it refuses to start as it know's it's DPF is Cactus) then you'll be able to fire it up again.

                          Funnily enough (not really funny) - it was that it was a similar trip to yours, through the Flinders to Alice then on to Uluru via the West Mcdonnell Ranges/ Finke Gorge that I was planning for this April as well. I had to can it (a month ago), because I was going to have family on board and I wasn't going to risk it. Having said that, mine has more than this as an issue and been off the road for weeks on end so it's a 'special case' - likely made as a practice run for production line workers at 6pm on a Saturday night before Mardi Gras in Japan.

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                          • Have heard people mention that the location of the 5th injector is possibly to blame? It is getting either blocked over or blocked open, causing limp mode or white smoke? You would think a massive company like Toyota would have all this sussed out before releasing a new engine to market. I've seen quite a few hilux's now putting up the smokescreen as they take off across intersections. It's not acceptable.
                            1979 BJ40
                            1992 FZJ80R
                            1997 HDJ80R
                            2005 GRJ120R

                            Comment


                            • Word is it the issue is injector related,
                              The angle and location, issues arising from that are as mentioned above.

                              Given the amount of complaints there are going to start receiving given the amount of 2.8s on the road, surly this will get addressed if not by Toyota but by the government.

                              Lets just hope it does not become too big of an issue to fix like the airbag saga.

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                              • Originally posted by CamJam View Post

                                Ah, yes. The reason I have just committed to purchasing another 4WD and took perhaps a $15K hit on it after less than two years. I just cannot trust it.

                                You most likely won't get a new DPF in time - they order them from Japan. However, what I did manage to confirm is that the DPF will have a limp-home mode so it shouldn't leave you fully stranded - and that if you disconnect the batteries for 30min after you shut it down (in the even it refuses to start as it know's it's DPF is Cactus) then you'll be able to fire it up again.

                                Funnily enough (not really funny) - it was that it was a similar trip to yours, through the Flinders to Alice then on to Uluru via the West Mcdonnell Ranges/ Finke Gorge that I was planning for this April as well. I had to can it (a month ago), because I was going to have family on board and I wasn't going to risk it. Having said that, mine has more than this as an issue and been off the road for weeks on end so it's a 'special case' - likely made as a practice run for production line workers at 6pm on a Saturday night before Mardi Gras in Japan.
                                Came back from my 7,000km trip to Uluru. The car only blew white smoke once when the engine wasn't hot enough in the morning. It seems DPF isn't causing any trouble on the highway at all. I didn't do any off-roading so can't comment on that. It did a regeneration this morning in the middle of a school run, surprisingly I didn't see any smoke and the burn finished in 12 km. I'm not sure if it is anything to do with my dash on M31 constantly at 120kph and above for 1 hour. I didn't intend to go over the speed limit, was simply following the traffic...

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