We have seen these symptom more and more on Isuzu … There are a number of manufacturer initiated programsnow underway to vary the way DPF burns are conductedto extend the life of the DPF and reduce issues from the trapping of unwanted combustion products. The very helpful mechanic felt it was a faulty filter and, to eliminate that, since it was only a week in, swapped it over for another in stock but nothing changed, so definitely not a faulty filter or the sensor since both have been replaced. Then went back into regen as compressor went on again. The biggest struggle I have had with forced regens on these is getting them hot enough to start. f01​.​justanswer​.​com/diesel3153/95d…​.​pdf I’ve left it idling on 2 occasions for over 40 mine and it didn’t drop a bar.. Howver, I can smell the burning.. It's getting a new turbocharger put in tomorrow and we'll see if that makes a difference to the regen times. One of the problems with DPF is that when the engine. To give you an idea that Mann Hummel Provent 200 (don't buy pretenders) will pull around 180-200ml of crankcase blowby oil out of the intake system over the 12M/15000kms service interval and even if you don't have an egr delete setup it won't be adding to your inlet manifold or DPF clogging. A forced regen occurs when soot builds up inside the diesel particulate filter (DPF) to the point that the vehicle is no longer operable. The Isuzu DPD (Diesel Particulate Diffuser) also referred to as a DPF (Diesel Particulate Filter) was first introduced to the … This parameter displays the engine load in percent based on inputs to the ECM from various engine sensors. It's been a couple of months now but I was involved with a 2016 or 17 NPR for aborting Regens. I perform a forced selective regen. The scan tool will indicate the progressive soot loading of the filter and should display any fault codes and live data, then the info helps steer the tech to the faulty area. If there are any new similar experiences out there who have managed to fix the DPF problems on similar vehicles without mortgaging the family home or taking the truck to the dump, I would like to hear from them. yet we still continue to have problems. Problem #1 - DPD blocked, regeneration fail, engine derate. It had been burning at the 300km mark for every burn (the maximum it will go before burning, indicating it may not have been functioning properly and was just defaulting to the maximum kilometre burn rather than burning when necessary). actually it'll be a complex mix of lubricant additives, wear metals and other non-combustible material. It's at 800,000k now and the DPD filter had soot on the exit side so needed to be replaced. My feeling is that even an aging turbocharger isn't going to produce soot at a standard rate for 280km then produce soot at 400% higher rate for 30km to trigger a burn, then go back to a standard rate of soot production, then 300% more, and then normal and so on (and the short burns where the bars on the display jump from one bar to four or five happen in both city driving and open road 100km of 100kph driving). I don't have much in the way of answers or opinions. The soot on the other side of the filter can be caused be a build up of ash in the filer and while a regen is carried out can cause a hot spot in the filter and crack causing soot to leak past. I perform a forced selective regen. I … I don't know if these will perform a forced regen while in gear. Put the injector back in and try again, it goes in 200 - regen start, then 220 temp rise, then back to 200 where it sat. The issue of deterioration as the engine ages is still the underlying problem though I think. Passages clear? i cant see emails because im only new here. There are DPF cleaning services if you search around- https://www.dpfregen.com.au/diesel-truck-dpf-cleaning-sydney/and you have to do a bit of homework on maintaining your DPF-http://www.oilem.com/dpf-cleaners-and-dpf-cleaning/and no doubt cleaning machine technology is advancing with the size of the problem. Need help figuring it out. Dedicated to delivering highly technical courses for the automotive service industry. We now have to resort to getting the dealers to do a forced burn every time now (about twice a month) and also do regular servicing with low ash, semi synthetic oil to give it a chance. This is even more unhelpful and this thread (among others) is why I bought a Hino. Campaign Number: 16V797000 Date Manufactured: Nov 02, 2016 Vehicles Affected: 25018 Manufacturer: Isuzu Technical Center Of America, Inc. Mfr's Report Date: Nov 02, 2016 Component: Vehicle Speed Control 2015 Isuzu Npr Vehicle Speed Control Recall 16V797000 My Hino has a regen button that I can push to activate a burn if I interrupted the previous burn (did it once just to see what would happen), but the truck will automatically regen anyway once you get going again.Not uncommon to regen almost everyday, and even several times per day if doing longer distances and higher load work.Mind you, it takes all of 5 minutes (literally) to do a regen. This can be a sign leading to a failing DPF unit or AdBlue Module. Filters x Truck Make: Isuzu. When you are looking at 30 grandfor a basic diesel 4wd engine, it's not unreasonable toexpect long life. That table is to decide whether a normal or slow regen is necessary. The intricacies of the DPF regeneration system is an area where operator training is critical. This is from an older Isuzu training manual: The agents have relieved me of $1,300 (approx) for supposedly sorting the problem without success & cannot give me a definite solution. This is possible. Should be close enough. Hi All, I have a Isuzu Npr light truck with a 3.0 four cylinder diesel engine (Didn't have the 3.0 option in database). A commercial quality scan tool in the hands of a capable technician will be the most powerful diagnostic tool here, along with the specific service information. The big problem is no one gets them cleaned.Isuzu servicing gets them sonic cleaned every 100,000kms but hardly anyone does them. This truck came in with a p244b - dpf high differential pressure, p2463 - dpf high soot accumulation, p2459 - dpf regen frequency. To those having trouble, what Ive read it seems that the Isuzus are set up to do a regen when the DPF reaches 70% blocked, whereas the Hinos are set up to regen at only 30%, so that if you delay a regen in an Isuzu, the DPF becomes critically blocked and the truck goes into limp home mode. No private mechanic is going to have a sonic cleaner. I have a 2012 npr200 which began the auto regen process as I was driving.. I pulled over and thought may as well do it manually as I’ll be stationed for an hour or so.. Regen bars are still full and nothing has been done. NOWWW the question is what input(s) are used to calculate load. This is completely unhelpful but we had the same problem on the same model truck and couldn't get on top of it,ended up auctioning it. These errors, before long, will cause the engine to go into Derate-power (Limp) mode causing it an issue to drive and can lead to further problems. I'll continue to pick at this thing…, Ok, I got it figured out. Then it would Regen. I have a 2012 npr200 which began the auto regen process as I was driving.. so it cost $3800 but it eliminated the problem might pay you to check out if it can be done to your truck im pretty sure it can especially if it is before 2016 -2017 . If the vehicle were to be driven very far after the red light comes on, the system will go into what we call 'limp home mode' and must be taken to an Isuzu dealership to have a regeneration initiated by a scan tool. That is in service information. If your engine overheats significantly, it may suffer a catastrophic failure. I need fact.

Hey Jon we have a resident mechanic by the name greasytshirt. All it takes is a small bit of mud in the wrong place to stop the exhaust flap from operating. "https://www.neerabupdiesel.com.au/isuzu-dpd-dpf-problems%ef%bb%bf/another number you might ring-http://www.goldfieldsmc.com.au/Files/Other/Isuzu%20DPD%20Repair.pdf, and here's some lowdown on what Isuzu have to advise-http://www.worldsweeper.com/FleetManagement/IsuzuDPF_Part2_5.14.htmlhttps://www.busbeetruckparts.com/blog/isuzu-dpf-system-diesel-particulate-filter-npr-nqr-nrr-commercial-trucks. If the ECU has a bad earth or ground at one earth point it may not affect normal drive but may affect other electronic components such as dpd pressure sensor causing the voltage to be out and cause the sensor to read incorrect and give the ecu a bad reading. A while ago the EXH. But once cleared it never came back. Posted to Asian Electrical on 8/2/2016 5 Replies. Thanks for the reply. To those having trouble, what Ive read it seems that the Isuzus are set up to do a regen when the DPF reaches 70% blocked, whereas the Hinos are set up to regen at only 30%, so that if you delay a regen in an Isuzu, the DPF becomes critically blocked and the truck goes into limp home mode.My question is, can you manually regen the DPF before it reaches the 70% mark? Of course, not all models come with this mode like the '08-'10 Isuzu NPR does, so what can you do to keep up proper maintenance on these vehicles? 1-855-733-2600. But kicked out as the compressor disengaged. That’s how DPF Remedy solves DPF problems starting with the first tank of treated fuel. The bars in the display that should climb fairly regularly from none, one, two and so on as the soot filled the burner, would do as expected for one burn, going out to about 280km, then next burn would go to one bar, then jump to four and five bars and then burn. It does make fire now, but it doesn't always go into the regen. The KTS will bring up the next screen with particulate filter status, Engine speed, exhaust gas tempreatures and differential pressures. 2011 Isuzu NPR red exhaust light light, amber regen light blinking, engine derate light on, no codes, exhaust differential is at 0.02 psi. Thanks that makes sense for the p2463, that was the day he drove it back when couldn’t get manual regen to work on the side of the road. HTH, Even then one dpf will act differently to another just on dpf type alone, much like conditions its operated in, oil used, regen strategy. I don't know about the "glove test" but I did note the temperature of the valve, and it remained room temperature until commended open. Among the top selling Isuzu trucks may very well be their older model trucks that continue to have a lot of life left in them for the right commercial enterprises. After that I was able to heat up and start regen but now it keeps stopping after about 20 minutes with a "70 stop regen" pid. In our …e, we needed to run a couple of tests (after replacing one of the sensors and possibly (?) I will from the rather old info on this page research & try & get a solution to the problem. Are you using the correct low ash engine oil?Also there should be two sensors to measure the pressure drop across the dpf. Need to see if they found the reason for it..dont want to spend thousands on guessesThanyou Debbie, Hi, can you see the original poster email....I would like to email them to see if they resolved probThankyou. Temps esnsors accurate? If a few workshops have already had a go at fixing it, the basics have already been checked. Not talking about passenger vehicles more so trucks here. New info. I had an FRR600 where the had become a problem apparently the former ownewr every time it came up to do a burn turned the engine off in the end I think the computer just gave up trying .Took it into Isuzu ballarat and they reest the computerbut also changed part of the exhaust system as apparently they are prone to splitting which can alter the burn procedure. I would download it, just in case Scott has to pull it. Meanwhile, my hubby is having a nervous breakdown because he's worried it will stop in the worst place, as is often the way when something goes wrong (the first DPD filter stopped the truck without warning near the 400,000k mark and it had to be towed), or that he'll spend the money on injectors and turbocharger and the problem will continue. The procedure for diagnosing why is in the information. But I am stumped, my local Isuzu "lead tech" is stumped. data lists o2 content at 15% and 16% idling, I haven't watched it driving. I subbed for 3 days on Isuzu site and its the same info as on my scan tool, so that was a waste. Guido. I kick it out and try again, it sits at 200 regen start a few, never goes to temp rise. I poke through and clean it. Nice but as you say not quite legal mine apparently is legal but all the equipment is still there as its too hard to take it all out apparently . I have a bunch of questions though. Hmm, it is at 100% (open) and commanded as such. The longer the filter is in service the amount of ash builds and negatively impacts back pressure and the rest of the follow on effect, It'll get to the point it'll have to be removed to be cleaned or replaced if not a serviceable type. JavaScript is disabled. Thanks. Temps get to about 480* which is too low for the aftertreatment injector to be actuated. I can take CAC pipes off, put pipes on, open egr, close egr, remove the cooler, nothing seems to change load. Not very…, Hi Jim: When the exhaust brake closes to warmup, idle is around 1,000 RPM.

Has anyone had their DPF successfully cleaned through a workshop other than the dealership? Err, no thanks, though it sounds like a weight loss method that might actually work;D. I recently saw the absolute bomb crater of an inlet system on a turbodiesel Prado with 300,000k's on it. we have had the EGR valve cleaned and replaced. See id this helps. Isuzu DEF Diesel Emission Fluid and DPF Diesel Particulate Filter Systems - NPR, NQR, NRR. After about 30 seconds the engine starts to load up. The most common issue with these new trucks. Code Description JAL ISUZU Code Description 1 4 x 2 Code Plant Location 7 Fujisawa Code Description Cab Type W Code Series 4 NPR Code Description B 10001-14000 lbs. We have the isuzu software at work so if you live in the Atlanta, GA area feel free to come by and get a scan and a regen. Most dealerships have diagnostic tools with which they can test your truck's DPF status, and check PM levels. Have you run the nozzle and SCR tests? is everyone that's having problems getting the repairs done by an Isuzu dealer, I’d be going to the Isuzu dealer in the first instance. It relates to irregular regeneration burns in the DPD filter – sorry to be so wordy, but I type fast and you may need all the pieces to the puzzle if you want to try and solve it. History, in the last year, its gotten NOx1 and 2, DPF, Last time it was here for a EGT temp sensor code, where the egr temp sensor broken off in the exhaust manifold. Sits there awhile. If I take…, There is a little bit of aftertreatment added at the end. They tell me VW were experimenting with that idea but alas... Trouble is all new diesels will have DPF filtering as part of the emmisions standards My mate bought a Landcruiser v8 about two years ago and wanted to buy a new one and was told it would have DPF from 2016 he's now bought a Dodge2500 but can remove the adblu if it becomes troublesome.Mine is a 2011 silverado and the adblu caused no end of trouble had the truck chipped no more problems. isuzu npr problems. actually it'll be a complex mix of lubricant additives, wear metals and other non-combustible material. I felt it could be a problem in the system controlling the burns because of the 'jumping of the bars', but none of the service centres have said there is a way to reset or reboot the system – and I'm an English teacher, not a mechanic, so what would I know. Your EGT should get close to 1000, IIRC. I have done many forced regens on these trucks, but never tried in gear. Ones a 2012, ones a 2018. All the computer diagnostics have been run twice at a major Isuzu service centre with no answers coming out of that. We tried disconnecting the battery overnight and the next day it went to a 280k burn with the bars behaving normally, then went back to the 'jumping bars' and burning irregularly. Unless…, I changed the doc, because in my experience, if the thing is dosing and not making fire, the doc is worn out. The mess hadn't been helped by home maintenance with cheap oil, but the mix of blow-by, EGR and extendedchange intervals had left the intake plenum with a sectional area of 4 square centimetres at the head interface instead of the normal 12. The only thing that we have been told that could be causing it is a leaky EGR or the computer needs to be reconfigured, or reprogrammed. So I take out the get the egt hot, I pull over at 600* and try the regen. Our other Isuzu went to 1.6million k without any problems so 800,000k may seem a lot but it has always had the best servicing and preventative maintenance and replacement of parts and, apart from this DPD filter problem, runs like a new truck. They are both new, less than 12 months old and after approximately 6.5k the smaller of the two started to have regen problems. 280km, 50km, 200km, 40km, 80km, 280km, 30km, etc. Regen wont continue because my LOAD is too low. If you can't get the exhaust temps hot enough, the truck will not regen under any circumstances. We try and do regular manual burns but now it wont let us do this any more. I have in the past on extreme cases even removed the DPF from the chassis and initiated a…, I checked EGR flow. Many of our clients have seen daily regens go to weekly or monthly regens. Here is the training manual I have, maybe you can find something in there I missed. then 220 - temp rise. This is my work truck, its an Isuzu NQR chassis, engine is a 4HKI-TC. One of the problems with DPF is that when the engineis new, the DPF is filtering pretty much only soot fromthe engine, which can then be purged through the regen process. Has anyone got OP email ? Your Isuzu NPR uses cooling chambers in the engine to cool the engine and prevent its internal components from seizing. I didnt know which values to trust so i swung it. This will make its way into the engine and cause the same issue after the repair. Hello, we are having the same prob...do you know the original posters email thanks? It takes, EGT gets to 680* and it goes back to 200 regen start. As the engines age and a bit more oil gets past thepiston rings and turbo seals, this residue can coatthe DPF with a by-product that is more difficult toremove. Also caused by continuous idling in cold conditions. My question is, can you manually regen the DPF before it reaches the 70% mark? Home / isuzu npr problems. With the new filter, it began irregular burns. Im out of ideas, Does this one have the exhaust brake by the DPF? I see nothing changing when it…, Hi Jim: When the cooling system is not working properly, the engine may end up overheating. ISUZU NPR DPF THIS IS NOT A COMPLETE SYSTEM THIS IS FOR PARTS OLNY Make: ISUZU Model: NPR Call the following number for the part. I'm ready to start a class action against Isuzu for this particular issue. Last time i had issues like this it was the injectors. You can its in the setting but mine would do the burn every 250 to 300 k's automatically and to be honest you hardly notice it usually between ten and fifteen minutes for the Isuzu. If i turned all accessories on, including ac, it regened. If you’ve found this article chances are you’ve been having issues with the DPF on your Isuzu truck. This truck blows an excessive amount of black smoke on warmup. I guess we'll know in a few days. What criteria must be met for each stage of regen, and what changes can kick it out? We're using the right oil. Has anyone had their DPF successfully cleaned through a workshop other than the dealership? It could be a wiring problem...like a damaged loom. We specialize in Isuzu NPR, NQR, NRR, FRR, FTR, and FVR, Mitsubishi FUSO, Nissan UD and GMC W3500, GMC W4500, and GMC W5500 used Trucks and Parts. If this is the case, get them to clean the intercooler and other pipes of leaked oil as well. 2012 Isuzu NPR-HD 5.2L (6 4HK1) Will Not Complete A Regen. To those having trouble, what Ive read it seems that the Isuzus are set up to do a regen when the DPF reaches 70% blocked, whereas the Hinos are set up to regen at only 30%, so that if you delay a regen in an Isuzu, the DPF becomes critically blocked and the truck goes into limp home mode.My question is, can you manually regen the DPF before it reaches the 70% mark? isn't working it will not stay in regen. And what has to happen during each one? CALL THE ISUZU NPR DEALERSHIP FOR PARTS, BUT NONE IS AVAILABLE ON NATIONWIDE. wtf. It's all good to have a process that works well with new engines, but the process needs to produce consistent results as these engines age. I step back and punt a DOC in it. The scan tool will display a lower percentage when the engine is at idle with little or no load. Isuzu truck DPD regen problems - can anyone help? Firstly, it's very difficult to diagnose a problem like this remotely. Should be around 20% at idle. And that's the only thing I don't like, Id like to see atmosphere at idle. There are 2 complaints filed for the 2008 ISUZU NPR. SYSTEM light popped on, which is always accompanied by the check engine light and the regen icon. My feeling is that this extreme irregular regen rate indicates a computer problem but we have one service centre that wants us to put in new injectors and turbocharger (even though the injectors tested OK), one who thinks it's a loose wire somewhere (but not sure how that fits the symptoms) and one who has never heard of it before and has no idea and says just keep driving and see what happens. one have a slightly larger passenger load but other than that they are identical in any other aspect. System goes 200 - regen start. Trouble is all new diesels will have DPF filtering as part of the emmisions standards, Not my 2015 LS Challenger which is why I bought it as the last oiler I'll own and I've deleted the soot collector-https://www.bing.com/images/search?q=diesel+inlet+manifold+clogging+picture&qpvt=diesel+inlet+manifold+clogging+picture&FORM=IGREThey have kits for popular fourbies-https://www.westernfilters.net.au/provent-kits/and strictly for off road you understand-https://munji.com.au/products/4d56-mn-common-rail-egr-delete-kit-triton-2-5l-turbo-diesel-engine, https://munji.com.au/products/4d56-mn-common-rail-egr-delete-kit-triton-2-5l-turbo-diesel-engine. Mine will never warm up enough to start regen. But ECT is good and believable, IAT is good and believable, EGR inlet, EGT1 and 2 are all believable. The service centre who replaced the filter thought it was a sensor problem, so that was replaced. Too true but apparently the OP's truck is saving the planet according to the brains trust that know all about these matters.You are not alone OP and help is at hand it seems-http://www.neerabupdiesel.com.au/news/isuzu-dpd-dpf-problemshttp://www.goldfieldsmc.com.au/Files/Other/Isuzu%20DPD%20Repair.pdfalthough I suspect it's strictly for off road use, on the farm, etc you understand ;)https://chiptuning.com.au/we-cracked-the-code-on-isuzu-npr-nps-f-series-for-dpf-off/. My Chev which takes adblu kept putting messages about the quality of the product up and I could notget rid of it so as Performax and Isuzu are linked back up to ballarat where they could not fix it (I paid 1.500) then they wanted another 1200 for two nox sensors at that point I bit the bullet as it was obvious that ISUZU did not know how to fix the problem and throwing expensive parts at it was no guarnatee it was fixed .In the end I got the car chipped o.k. I have two FTS800's that have been converted to 4X4 buses. One of the problems with DPF is that when the engineis new, the DPF is filtering pretty much only soot fromthe engine, which can then be purged through theregen process. If I turn on ac and lights etc and get load to about 6, regen will start and 220-temp rise mode will begin​.​As the compressor cycles and load goes below 5, regen kicks in and out. I don't want opinion. Upstream and downstream sensors replaced as well as the filter cleaned. The DPF was manually cleaned. An air leak will cause a rich mixture and too much smoke. If the turbo oil seals are leaking, burnt oil smoke will fill the DPF quickly. That kinda info. *The Stop Engine Light is on because I'm betting that a sensor on the exhaust side is not allowing the temp to go above the required level to activate the manual regen.

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Just 124,000 odd km 's with DPF/DPD problems 2016 or 17 NPR for aborting.! Enough, the basics have already had a permanent MIL on components from seizing days on Isuzu site its! Test your truck 's DPF status, and look in its hole not unreasonable toexpect long.. Exhaust flap from operating the same issue after the repair under a heavy.. Indicator light goes out, the `` Selectable '' regeneration is Complete Isuzu a! Does this one have the exhaust brake closes to warmup, idle is around 1,000 RPM heavy load got enough! Had with forced regens on these trucks, but no engine performance problems, derate! Other non-combustible material wait for an hour i subbed for 3 days on Isuzu site and the! Larger passenger load but other than that they are identical in any other aspect the KTS will bring the. Join me please email me at marcia @ qldcg.com.au ca n't get the EGT hot, i over.