Isuzu d max dpf

Trigger1975

New Member
Hi
I have 2013 Isuzu d max , pretty much been good as gold until the end of last year .
The truck started doing a dpf regen every day on the way to work (10-12) miles at the time . Booked the truck in for a terraclean which mildly resolved the problem to a regen every second day . 6 months down the line after various journey lengths and various speeds the problem has got worse .
Dpf light and buzzer came on on Sunday and after some research I found I had rising oil , over the x on the dipstick !
I’ve rang 2 Isuzu dealers and had no contact back in 24hrs now so for safety I changed the oil and filter last night.
The oil was very very thin and I estimate around 10ltrs drained out which is obviously diesel mixed in . I have also changed the fuel filter and the truck seems gutless, it will rev freely when your foot is on the clutch but is very slow reving under acceleration.
Any help or advise would be very grateful cheers
 

spin cycle

Member
Location
north norfolk
don't know...but if diesal is leaking in then thats the problem?...with the dpf being the 'symptom'.....so how could diesal be getting in?....through a stuck open coldstart perhaps?.....had this on a tractor once
 

ct773

New Member
Hi
I have 2013 Isuzu d max , pretty much been good as gold until the end of last year .
The truck started doing a dpf regen every day on the way to work (10-12) miles at the time . Booked the truck in for a terraclean which mildly resolved the problem to a regen every second day . 6 months down the line after various journey lengths and various speeds the problem has got worse .
Dpf light and buzzer came on on Sunday and after some research I found I had rising oil , over the x on the dipstick !
I’ve rang 2 Isuzu dealers and had no contact back in 24hrs now so for safety I changed the oil and filter last night.
The oil was very very thin and I estimate around 10ltrs drained out which is obviously diesel mixed in . I have also changed the fuel filter and the truck seems gutless, it will rev freely when your foot is on the clutch but is very slow reving under acceleration.
Any help or advise would be very grateful cheers

Sounds like there is an underlying issue causing the dpf to block and the constant regeneration. Its likely to be either overfuelling (injectors), a lack of air (boost leak, egr valve or turbo) or a sensor fault (dpf's pressure sensor giving a false reading). Best to book it into the dealer to check it out as these things aren't always easy to diagnose. I know there was a guy on here a while back that had injectors changed on a dmax.

Dpf's have a bad name but there is normally always another component that is causing the issue. You did the right thing changing the oil!

Let us know how it goes.
 

Dim Reaper

Member
Location
North Yorkshire
I don’t know how to do a link, but I think it would be time we’ll spent if you went onto YouTube and looked at the John Cadogan “Near death DPF video”. He waffles on a bit at the beginning but eventually explains why a DPF might cause problems. Worth a watch before you do anything else.
 

Mursal

Member
Try disconnecting the battery and joining the leads overnight (to try and clear fault codes leaving it lifeless to drive).
The extra diesel is used to burn out the DPF and instead goes down past the rings.
May need a software upgrade to solve it, just keep an eye on the level, as it has been known for engines to run on the diesel fumes from the sump, so the engine over revs and you'll need a new one.
 

ricky_rascal

Member
Location
N. Yorks
I had a 2013 dmax that had same symptoms. Started regening every 15miles or so. Took it back to dealer a few times and eventually said they'd had a few doing it and prob was injectors over fueling. The fix for it was new injectors. One of the injectors was stuck in and had to lift engine out to get head off. Then had a months wait for injector seats (or something). Did it fix it - I don't know as did a deal on a new 'old model' d-max. Later 2.5's didn't seem to have the issues the earlier 2012/13 models had ... I'm led to believe.

If you change the oil you need to get something to do with oil dilution parameter reset at dealers or your local garage will probably be able to do it.

DPF issues difficult to diagnose. Your symptoms are the same as my old one had. Don't know if you're still under warranty but if so go to an Isuzu dealer. Injectors could be over fueling. Daft thing is the more the oil gets diluted (or the software thinks the oil is diluted) the more if regens. Changing the oil and not resetting that oil dilution parameter and the software still thinks the oil is diluted and regens just as often.

I had local garage take the dpf off mine and have it cleaned out. This they did and changed oil and reset oil parameter. 30 miles later and then another 18 miles after that and it regened just as often. Waste of time. Garage (whom I trust) said dpf wasn't really that bad and certainly a long way off being blocked. I thrashed it all way down to Oxford from Yorkshire and and it still regened every 20 miles or so even on motoway.

Isuzu method of squirting extra diesel on exhaust stroke during a regen to heat up the dpf is not the best way of doing it. A better bet would have been a 5th injector direct into dpf - I'm told. Some of the diesel washes down cylinder walls and into sump - great idea NOT! Not really sure why I swapped for another d-max?? Anyway the 17 plate 2.5 I have now seems to be fine - as you would expect.

Get the injectors checked out as could be over fueling. Mine were changed under warranty but unfortunately I don't know if it cured the problem. I was chatting to fella that changed them at dealers and he said they'd given it a good test drive and it seemed to be fine. I never drove it again.
 

Timbo

Member
Location
Gods County
Abit like the infamous 4jx1 , isuzu have repeated themselves through cost cutting - these trucks are going become pretty much unwanted after the warranty period with values to match.
 

kiwi pom

Member
Location
canterbury NZ
Isuzu trucks (HGV's) have highest market share here, mostly I think because they're cheaper than anything else. Is it the same for the pickups, cheap and mostly do their job but cheap for a reason.
 

Trigger1975

New Member
Thanks for the feedback so far especially ricky_racal who’s problem sounded identical to mine !
So my truck went into an indipendent garage last Friday , the guy checked the truck over including checking all the injectors . One of the main problems they did find was the air filter was totally knackered and clogged with lost of dust and straw !
They also checked and re set the oil parameter . They then done a dpf terraclean and put out all the lights , test run the truck and all seemed fine

Saturday morning I filled the truck up and put in a dpf cleaner from euro car parts and set of to Blackpool to collect something I’d won on eBay .
All was well for about 30 miles when the truck done it’s first regen which they said it would do until it settled down , another 30 miles past and the dpf light came on this time solid not flashing and sounded the buzzer , once it had done the regen this went out .
My drive to Blackpool and back was in total 470 miles and by the time I got home it was doing a regen closer to every 60 - 80 miles !
Mpg was an average of 37.6 which was a vast improvement considering I was rattling along with the aircon on most of the way there and all the way home .
Checked the oil on Sunday evening and it’s alread started rising again and back to doing a regen nearly every day possibly due to my short drive to work .
Isuzu have eventually got back to me now and the truck is going back to them on Tuesday, I hope they can fix it as I’ve lost a lot of respect and trust in the vehicle now which is a shame because it puts me off of having another Isuzu !
 

Timbo

Member
Location
Gods County
The only thing to suggest is to ask the dealer to check the software the truck is running - there was more than a dozen that address regen / emission stuff . Aftet that you must have a mechanical problem - stuck open egr or injector problem. Regens every 80 miles is just nuts, should be passively cleaning itself at motorway speeds and only need to start an active one every 2-300 miles ...
 

balerman

Member
Location
N Devon
There have been countless threads on this forum(and others) about this issue,and getting panels for crashed ones.Must be affecting the resale value by now.Count myself lucky to not have any vehicles with a DPF.
 

ricky_rascal

Member
Location
N. Yorks
I'd be interested to know if Isuzu fix it. Unfortunately I don't know if new injectors fixed my old d-max as I traded it before they repaired it. Bear in mind if was off the road for over a month waiting for parts.

Isuzu had some decent deals on the last of the 2.5L d-max's so ended up getting another one. Even though it's the same engine it seems to run better, more so when doing a regen, than the old 13 plate. My old one was one of the early d-max's that had the lower towing capacity. Doing a regen used to sound rough. All ok so far but will I live to regret it - probably! Least it's got 5 years warranty. I did plan to trade it for a Ford Ranger. Didn't like the new 1.9 D-Max and Isuzu can say what they like - the 1.9 is a step backwards. The auto I demo'd for a week always felt like it was revving its guts out - every incline it came to would be dropping down a gear or two.
 

jhorr30

Member
Location
Edinburgh
That was my thread. I cant see Isuzu fixing it, its a systemic problem. We got rid of ours and have not looked back.
Got rid of my 2012 Dmax auto in October 2015 after at least 20 attempts by the garage to repair the constant regeneration fault. Was filling the sump up with diesel that fast it was getting an oil and filter change every 1000-1200 miles. Dangerous hesitation when trying to drive away was another fault. Loved the pickup just detested the hassle of driving a 60-70 mile round trip to the dealer every 3 weeks to get yet another oil change. Dealer wasn't up to much and Isuzu just didn't want to know. Add in the rust on the body work and badly corroded wheels and roof rails at a year old I just lost faith in it. Got rid before the engine blew up and Isuzu washed their hands of repairing it. Can't see me buying another Isuzu product again.
Bought a Ford wildtrak auto. Different class of machine and all its had in 38000 miles is a new button on the steering wheel for the voice activation and a new heated windscreen under warranty after it cracked due to the adhesive not sticking it down properly.
 

Elpresidente

Member
Location
West Wales
My experiences and lessons learned during my time of owning a Dmax are the following.
My Dmax regened every 187 miles normally but one tankful of Tesco fuel would immediately drop that interval to anything between 90 and 130 miles. The cetane rating of Tesco fuel is extremely low as the engine in the Dmax sounded like a bag of spanners. To rectify the situation I stopped using Tesco fuel and also started adding a double dose of Millers diesel fuel,additive which restored the regen interval. I am not the only one to suffer issues with Tesco fuel I have a cousin who runs a 3.2 ranger and it went into limp mode after filling up with Tesco fuel as soon as he managed the use up quarter of a tankful and fill up with Shell premium diesel it rectified itself.
I also used to undertake special regen journeys to make sure that all regents were fully completed, I have to say Isuzu have chosen a useless system to do Regens compared to other manufacturers. I eventually had enough of its nonsense and part exchanged it for a Navara at Holdcroft Nissan who were fantastic to deal with and did a great deal.
 

Farmer Roy

Member
Arable Farmer
Location
NSW, Newstralya
1.9 l :eek:
The only engine available in Isuzu here is 3 l
They do run DPF, but haven't heard of too many issues. My nephew recently bought one, I'll see how he goes
Most issues here with DPF seem to relate to "town" cars, short distances & stop start traffic conditions
I did have. 3 l dmax, but pre DPF, but zero engine problems
 

ricky_rascal

Member
Location
N. Yorks
Yes, 1.9L - The HP is the same as the 2.5 but torque is lower. When I had the 1.9 demo then the lower torque was noticeable, especially under 2000rpm. This would be why the auto model was always dropping down a gear to mask that lack of torque low down.

Our local dealer is good enough and confident they'd do their best to sort an issue (though not sure this dpf issue is easily rectified). When I asked how test drives were going on the then new 1.9 d-max, evidently I wasn't the only one to be unimpressed. I think I see more new Ford Rangers than face lifted D-Max's around here these days.

Got rid of my 2012 Dmax auto in October 2015 after at least 20 attempts by the garage to repair the constant regeneration fault. Was filling the sump up with diesel that fast it was getting an oil and filter change every 1000-1200 miles. Dangerous hesitation when trying to drive away was another fault. Loved the pickup just detested the hassle of driving a 60-70 mile round trip to the dealer every 3 weeks to get yet another oil change. Dealer wasn't up to much and Isuzu just didn't want to know. Add in the rust on the body work and badly corroded wheels and roof rails at a year old I just lost faith in it. Got rid before the engine blew up and Isuzu washed their hands of repairing it. Can't see me buying another Isuzu product again.
Bought a Ford wildtrak auto. Different class of machine and all its had in 38000 miles is a new button on the steering wheel for the voice activation and a new heated windscreen under warranty after it cracked due to the adhesive not sticking it down properly.


The new (last Oct) 2.5 D-Max I have currently is running fine. DPF seems to regen every 150 to 200miles though further on motoways. It does get a lot of short runs which may be its downfall given time. I try to make sure it completes every regen, even if it means a drive round the block (so good for the environment :confused: ). I keep an eye on oil level and doesn't seem to have risen. Paintwork seems fine with no rust spots that I can find. The throttle lag, though still there, is nowhere near as bad as my old d-max was.

I possibly should have got a Ranger. Maybe by the time I'm ready to change the d-max, Ford will have released a Ranger in the UK with the EcoBoost engine and 10 speed auto box (y) Time there was the choice of a petrol engine option in a pickup as diesel seems about as popular as a rattle snake in a lucky dip these days. Would make more sense for someone who does a lot of shorter journeys. It seems most DPF's don't like shorter runs.
 

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quote: “Red Tractor has confirmed it is dropping plans to launch its green farming assurance standard in April“

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