DPF regen takes more than one hour in the city.

[joejoejoejoe Junior Member Find all posts View Profile Close joejoejoejoe]

Hi all,

Recently I did a 2000km long run and I found out the dpf regen takes longer and longer. Especially the last regen, on the highway, the temperature in the dpf hardly to reach 600. And it takes double time to burn than usual. And from 100 to 44 looks all right but slow, after that from 44 it jumps to 0 in one second. Now I'm in the city, it usually takes 30 minutes to burn off the soot, but now, it takes one hour to finish the job.

My question is, is it relate to the new installed oil catch can? What's wrong with it?

Thanks guys, it really confuse me a lot.

[prodoco Junior Member Find all posts View Profile Close prodoco]

Potentially the 5th injector is clogged, if last 30% dpf regentiation cant reach 650c or above. Same story happened to me when i did 1400km trip last year, came back with clogged dpf and white smoke when i drove off traffic light. Dealer replaced new dpf.
This car is designed for city driving or slow off road which provids the best temp for dpf regenation.

[joejoejoejoe Junior Member Find all posts View Profile Close joejoejoejoe]

Potentially the 5th injector is clogged, if last 30% dpf regentiation cant reach 650c or above. Same story happened to me when i did 1400km trip last year, came back with clogged dpf and white smoke when i drove off traffic light. Dealer replaced new dpf.
This car is designed for city driving or slow off road which provids the best temp for dpf regenation.

The last 30% can reach 650c. And what I found out is there is no white smoke currently. Now the problem is I got another 2500km to go. I have no idea whether it can survive this trip or not.

[prodoco Junior Member Find all posts View Profile Close prodoco]

The last 30% can reach 650c. And what I found out is there is no white smoke currently. Now the problem is I got another 2500km to go. I have no idea whether it can survive this trip or not.

Sounds all good to me if DPF temp can reach 650C+. From what i found last 500KM trip were DPF took much longer to burn off if i was on 110KM/H+ hwy driving (70KM to finish the burning), in city it only takes 25KM to finish the burn and temp can hit really high to 720C. Enjoy your trip

[cuda Advanced Member Find all posts View Profile Close cuda]

Run the engine in 4th gear at 110km/h. It will increase the temp of the DPF to over 700 deg. You probably had the temp not operating high enough in the DPF for too long. I found when the DPF got to over 800deg it improved burn time and fuel consumption. As from a previous post the DPF percentage full is a calculation and I suspect that if the temp is not high enough +650 deg then it will consider its not burning well and will take longer to burn. I managed a burn in about 8 mins when it was operating at +800deg (Sand dune driving low range). Good luck.

[RPP Senior Member Find all posts View Profile Close RPP]

I've done about 8,000Km in my 2018 Prado so far and have logged all DPF burns using my Scangauge. At highway speeds (100-110Km/hr) its taking about 75Km (60-90+) to complete a burn (down to 6% or 4% and sometimes 0%). Yes it seems to go slow from 100% to say 50%. and then goes fast. I've had it stuck at 18% for a while and then instantly drop to 0%. I assumed the filter had a light covering of soot that suddenly all got blown out in a flash.

In the city (Adelaide) at stop/start speeds (0-40-60Km/hr) its taking about 22Km to complete a burn. It will continue the burn at traffic lights and if I park overnight during a burn, it will continue the burn the next day after the engine warms up.

I have only recently programmed my SG to read the DPF temp. I have seen it peak at over 690degreesC (assuming it is reading as advertised). But mostly below 600degrees (mid 500s) during the early stage of the burn. Aluminium melts at 660 degrees!

If yours is taking a hour in the city (and you haven't parked at the shops with the engine off for most of that time I'd be gathering the data and giving Toyota a warranty call.

[brogers Advanced Member Find all posts View Profile Close brogers]

Run the engine in 4th gear at 110km/h. It will increase the temp of the DPF to over 700 deg. You probably had the temp not operating high enough in the DPF for too long. I found when the DPF got to over 800deg it improved burn time and fuel consumption. As from a previous post the DPF percentage full is a calculation and I suspect that if the temp is not high enough +650 deg then it will consider its not burning well and will take longer to burn. I managed a burn in about 8 mins when it was operating at +800deg (Sand dune driving low range). Good luck.

Some help please folks. I have a scanguage 2, and I can monitor EGR temps, and DPF %, but I can't seem to find the Xgauge code for DPF temp....does someone have the Xguage code (or a link to the code) for the actual DPF temp please.

(2.8L GD Prado)

[joejoejoejoe Junior Member Find all posts View Profile Close joejoejoejoe]

Some help please folks. I have a scanguage 2, and I can monitor EGR temps, and DPF %, but I can't seem to find the Xgauge code for DPF temp....does someone have the Xguage code (or a link to the code) for the actual DPF temp please.

(2.8L GD Prado)

[RPP Senior Member Find all posts View Profile Close RPP]

Another factor I have seen is when I park the car (ie got to work or home) before the DPF burn cycle completes. The DPF burn will resume when I start the car again, but if engine is cold it can take 6-8 Km (in winter) before the DPF% drops again. During that time the DPF% will go up maybe 2%. Therefore, one might say that doing nothing but short stop-start drives (eg commercial vehicles at a mine site) the DPF may not get the chance to ever clear itself.