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OzDriver · 01-12-2016, 12:23 PM

Interesting. I have sometimes spotted my 2.8 trying to 'do a burn in town' i.e. keeps holding higher idle and sometimes lower gears. If this happens again and I arrive home with it still smelling and with high idle I will try the 15 min 2000rpm test to help it finish its burn. Not sure I would want to keep doing that every 300km, but worth a go now and again.

120D4D · 01-12-2016, 05:03 PM

How does that work Doug?

Only when the DPF is already doing its burn? Or are you saying that we can run it at 2,000prm anytime whilst stopped and it will manually burn?

Running at hwy speeds and 2,000rpm for 20 mins doesn't make it manually burn...

GEEEXL · 01-12-2016, 05:13 PM

200rmp on an unloaded engine . . . . . not my idea of fun

cuda · 01-12-2016, 05:36 PM

Originally posted by 120D4D View Post

How does that work Doug?

Only when the DPF is already doing its burn? Or are you saying that we can run it at 2,000prm anytime whilst stopped and it will manually burn?

Running at hwy speeds and 2,000rpm for 20 mins doesn't make it manually burn...

OK what I think happens here is when the system has initiated a burn the 2000 rpm procedure works. However the tech kinda indicated it could be done with or without the ecu initiating the burn (injecting diesel into DPF). I am trying to get my hands on a Techstream setup to test the theory out myself. My guess is while you are travelling at speed and running the engine around the 2000rpm mark the airflow around the engine is keeping the DPF and engine cooler which may affect the burn.

I will update once I have the techstream and run some tests of my own.

Doug

GEEEXL · 01-12-2016, 05:47 PM

2000rmp on an unloaded engine . . . . . not my idea of fun

404pug · 01-12-2016, 07:28 PM

Will it not work by allowing it to idle for the 20 mins once it has started a burn? [as opposed to 2000 rpm]. I read somewhere that this is the advice for a Toyota Coaster with DPF. ie stop and have a cuppa while it does its thing. Perhaps someone with access to a current Toyota Coaster handbook can confirm?

cuda · 01-12-2016, 08:27 PM

Originally posted by 404pug View Post

Will it not work by allowing it to idle for the 20 mins once it has started a burn? [as opposed to 2000 rpm]. I read somewhere that this is the advice for a Toyota Coaster with DPF. ie stop and have a cuppa while it does its thing. Perhaps someone with access to a current Toyota Coaster handbook can confirm?

Yes and no. This maybe the reason why the DPF is slowly building to a full blockage. Starts clean and first burn only does 96% same at second etc which would mean a slow build up within the unit. I am only speculating on this though and would really like to investigate with the Techstream to confirm.

Thanks
Doug

Wildfire · 01-12-2016, 10:11 PM

On the weekend I noticed something similar, I live 15min out of town so I thought that the usual 100km/hr trip would be good for the dpf however of late fuel consumption is going up and up.( I use fuel lite app) On the weekend I went south 200kms sitting on 100km/hr to see a mate. On the way home I got a bit keener and sat on 115km/hr and more plus occasions overtaking. Since sitting on 1800rpm plus on the way home the fuel consumption has come back down to a more normal reading. This is despite many usual burns here at home. Car is at 15500kms now. Starting to think I might have to give it a "good run" when fuel consumption is creeping up to try and make that stupid dpf last as long as possible? To add a bit more I've noticed now when it does do burns they last up to 1/2hr, I never noticed burns this long in the first 10000kms. I figured this had a lot to do with why my fuel consumption had been getting higher. I'll have to put it in sports mode next burn and keep the revs up to see if it has the same result.

ozimacca · 02-12-2016, 02:29 PM

I have a 3.0 150 so no DPF but still an interesting thread.

When a burn is due would it be practical to drive in S4 or S5 for while to encourage a cleaner burn ?

rob_macca67 · 03-12-2016, 08:45 AM

Interesting reading.....

Just curious here, but when doing remote touring (eg: CSR) and the track your driving on has spinifex in the middle and your vehicle decides to do a "burn", what's the dangers with the increase in heat of a fire developing? IS the DPF located high up out of the way?

I think I might stay with vehicles w/o DPF's.....

yowie · 03-12-2016, 09:56 AM

Originally posted by rob_macca67 View Post

Interesting reading.....

Just curious here, but when doing remote touring (eg: CSR) and the track your driving on has spinifex in the middle and your vehicle decides to do a "burn", what's the dangers with the increase in heat of a fire developing? IS the DPF located high up out of the way?

I think I might stay with vehicles w/o DPF's.....

I think they are down a bit where the heat generated will cook any grass to the point of burning.

With my new 200, I was advised (also in the manual) to keep away from any grass or inflammable material during a 'burn' sequence.

2 of the DPF bastards on the 200. Supposed to last 150k (then out of warranty period) over $2,000- each to replace when stuffed. Will need to find 'fix' before that time.

Falco80 · 03-12-2016, 02:52 PM

Originally posted by cuda View Post

Hi,

My guess is the automated burn does not completely remove the blockage and over thousands of k's the filter starts to block up.

Regards
Doug

Yeah, the burn off never completely removes all the soot. What it burns off it turns to ash and this ash is what blocks the DPF eventually. It will happen. If one of these engines is being used to potter around town or drive 5 mins down to the shops, well that DPF is going to clog up sooner rather than later. The salesman doesn't mention this though.
When I owned my Forester diesel, I could get a print out of engine data at every service. It listed the "Soot accumulation ratio", "cumulative ash ratio" and "DPF regen count". All handy info to know and trend if you've bought the car from new. Not sure if Toyota can offer this, but I sure wouldn't buy one without keeping track of that information.

mjrdmo · 03-12-2016, 04:01 PM

So my Prado has only done 6000Km of which about half has been at highway speeds. How do I know when the DPF is getting full, and is there a lamp or display somewhere so I know when the burn is happening?

120D4D · 03-12-2016, 06:45 PM

Originally posted by rob_macca67 View Post

Interesting reading.....

Just curious here, but when doing remote touring (eg: CSR) and the track your driving on has spinifex in the middle and your vehicle decides to do a "burn", what's the dangers with the increase in heat of a fire developing? IS the DPF located high up out of the way?

I think I might stay with vehicles w/o DPF's.....

Many a vehicle has burn many an acre of farm land with hot exhausts. I know of one guy the burnt hundreds of acres with his petrol ute.

Exhaust heat is more than hot enough to burn spinifex, the danger of a DPF equipped vehicle is the same as any other, hence the practice of regularly checking underneath and being aware of where you stop/park the vehicle.

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