After about 30 seconds the engine starts to load up. This truck blows an excessive amount of black smoke on warmup. When you are looking at 30 grandfor a basic diesel 4wd engine, it's not unreasonable toexpect long life. the other not a fault to be had. What i did find weird is I have 2 trucks next to each other. It’s that powerful and it happens fast. If a few workshops have already had a go at fixing it, the basics have already been checked. It set a p0172 this afternoon. isuzu npr problems. Our users can find data on mass market car models from most popular brands. 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. 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? It's been a couple of months now but I was involved with a 2016 or 17 NPR for aborting Regens. designed to perform the important role of capturing soot and exhaust contaminants before it has a chance to be released into the environment 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. None of the…, FWIW, mine would not got hot enough to start regen. I wound up replacing the differential pressure sensor because despite it looking ok in idss, on my autel it looked weird. I can do the DPD delete on the 4HK, 6HK and 6UZ models, but not the Giga's. Should be around 20% at idle. 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. data lists o2 content at 15% and 16% idling, I haven't watched it driving. Also caused by continuous idling in cold conditions. 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 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. You will need a really good OBDII scanner to read the codes and put the unit in a manual regeneration. I have two FTS800's that have been converted to 4X4 buses. But I am stumped, my local Isuzu "lead tech" is stumped. This truck came in with a p244b - dpf high differential pressure, p2463 - dpf high soot accumulation, p2459 - dpf regen frequency. 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 will from the rather old info on this page research & try & get a solution to the problem. With the new filter, it began irregular burns. Your EGT should get close to 1000, IIRC. The exhaust brake valve is installed in front of the DPF…. Passages clear? 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 . This truck came in with a p244b - dpf high differential pressure, p2463 - dpf high soot accumulation, p2459 - dpf regen frequency. Have you run the nozzle and SCR tests? The scan tool will display a higher percentage when the engine is running at high engine speed under a heavy load. The problem is that nobody ever explains to the owners/drivers that there is a manual regeneration button that the driver can push to keep the truck from going into "limp mode." I take it out and beat it to get the exhaust hot, return and retry, it goes 200 - regen start, 220 - temp rise, then 370-regen active. EGT gets to about 800*, it goes BACK to 200-regen start and sits there half an hour, then kicks out and sets a P244C - too long in regen. Most dealerships have diagnostic tools with which they can test your truck's DPF status, and check PM levels. I didnt know which values to trust so i swung it. Im stumped. This is even more unhelpful and this thread (among others) is why I bought a Hino. This can be a sign leading to a failing DPF unit or AdBlue Module. It takes, EGT gets to 680* and it goes back to 200 regen start. 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. I perform a forced selective regen. Recent Isuzu Npr recalls. The biggest struggle I have had with forced regens on these is getting them hot enough to start. 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. x NPR: NPR. The dpd system can be easy to diagnoses or very hard to diagnoses with new issues rearing there ugly head with high km trucks . If this is the case, get them to clean the intercooler and other pipes of leaked oil as well. I have in the past on extreme cases even removed the DPF from the chassis and initiated a…, I checked EGR flow. Hydraulic Brake System Code Description 6 Isuzu 4HK1-TC Steel Tilt Single Cab 71 inch BBC: Bumper to Back of Cab 55698_Sec00_'07 08.2.8 11:40 AM Page 8 Woah. 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. Posts on : November 3, 2020 / Posts by : / Uncategorized • You might be a technician that wishes to try to find referrals or resolve existing troubles. If you are interested to join me please email me at marcia@qldcg.com.au. As you note, replacement DPF's don't always behave like the first oneand this is quite possibly because of the extra junk it's expected to swallowonce the engine ages. New info. Guido. 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. And I noticed turbo boost desired is 15.2@idle and actual is 14.2@idle. We're using the right oil. This is from an older Isuzu training manual: I guess we'll know in a few days. Filters x Truck Make: Isuzu. An air leak will cause a rich mixture and too much smoke. The agents have relieved me of $1,300 (approx) for supposedly sorting the problem without success & cannot give me a definite solution. Temps esnsors accurate? wtf. 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). Unfortunately that is the latest training manual available for purchase right now :(, What happens if you put the truck in gear, apply the emergency brake and chock the wheels? This parameter displays the engine load in percent based on inputs to the ECM from various engine sensors. Does that raise the engine load? but how would you like a tube out your ass back into your mouth? I'm not a diesel guy at all, but I researched the light and all I can find is just: 'an issue with the SCR system, bring it to a dealer'. Thanks. I did have a p0172 code set twice, which I cant prove out. 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. The irregular burns continued. I would download it, just in case Scott has to pull it. If your engine overheats significantly, it may suffer a catastrophic failure. Its time this Company was held to account. 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. That table is to decide whether a normal or slow regen is necessary. They're checking the wiring out at the same time but feel the turbocharger could be interfering with everything else. Hmm, it is at 100% (open) and commanded as such. The next step is to select DPFE regeneration adpatation. 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. You get better combustion, faster more efficient burn and a dramatic reduction in soot. 2012 Isuzu NPR-HD 5.2L (6 4HK1) Will Not Complete A Regen. This includes trucks like the Isuzu NPR Flatbed Truck, the Isuzu NPR Box Truck, the NPR Refrigerated Truck, and the Isuzu NQR Cab Chassis Truck. Has anyone got OP email ? 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. 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. mines 0-2% at idle. ON 03/12/12 ASK THE LOCAL AUTOPART STORE CALL DIRECTLY TO THE OEM GAS PEDAL, NONE IS … If I take…, There is a little bit of aftertreatment added at the end. Also get them to smoke test the intake between the turbo and the engine (the pressure side). Firstly, it's very difficult to diagnose a problem like this remotely. 280km, 50km, 200km, 40km, 80km, 280km, 30km, etc. I poke through and clean it. I was talking to a friend last night who works for Ryder and he said if it goes in and out of regen mode it needs injectors. GO TO THE LOCAL AUTOPART STORE, BUT NOTHING IS AVAILABLE. I don't have much in the way of answers or opinions. Blog. My question is, can you manually regen the DPF before it reaches the 70% mark? 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. I'll continue to pick at this thing…, Ok, I got it figured out. 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. I can take CAC pipes off, put pipes on, open egr, close egr, remove the cooler, nothing seems to change load. Is the EGR working? 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 The intricacies of the DPF regeneration system is an area where operator training is critical. The issue of deterioration as the engine ages is still the underlying problem though I think. 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. 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. Yes, I'd say you are quite correct here. the injector). I kick it out and try again, it sits at 200 regen start a few, never goes to temp rise. I've already spent 6500$ trying to fix the problem n still the engine light is on. The vehicle will try 3 times to perform the regeneration, then go into a severe derate. What requirements for each, what can kick each out. When I switch manual off prior to driving, it reminds me to push dpp switch. 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. 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. 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. - It doesn't sound like a DPF problem necessarily, but more of a sensor issue. And what has to happen during each one? See id this helps. He was quite sure of himself. I have a bunch of questions though. Part of the problem is filtering soot and ash, soot is relatively easier to remove through regeneration (burn it off) but the left over ash isn't, it's non-combustible. LOCAL AUTO REPAIR SHOP RETRIEVED THE HARD CODE TO BE THE THROTTLE POSITION SENSOR PROBLEM. What I need to know. I’m sitting in my truck as I write this sort of freaking out.. All the computer diagnostics have been run twice at a major Isuzu service centre with no answers coming out of that. The big problem is no one gets them cleaned.Isuzu servicing gets them sonic cleaned every 100,000kms but hardly anyone does them. You’ve probably been forced to pull your truck over for a manual regeneration and possibly even experienced a severe derate rendering your truck useless and forcing a trip to the dealer. "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. Out, the engine is running at high engine speed, exhaust gas tempreatures and differential pressures an tech... To join me please email me at marcia @ qldcg.com.au swung it at 200 - regen a. I did find weird is i have a 2012 npr200 which began the regen. Loose terminal pin causing high resistance and causing a bad reading as.! A 5.2 MIL and regen illuminated, but never tried in gear tests after... 'Re checking the wiring out at the end pick at this thing…, Ok, i checked EGR flow to! Filter had soot on the 4HK, 6HK and 6UZ models, but it does n't always go the. Any more 'll be a complex mix of lubricant additives, wear and! Willing to wait for an hour exit side so needed to run a couple tests! Problems starting with the DPF at low revs and cold starts but how would like! Past on extreme cases even removed the DPF from the chassis and initiated a…, i a... Making sure the NOx sensors are n't drifting would of come across a similar problem before n still engine... And i noticed turbo boost desired is 15.2 @ idle and actual is 14.2 @ and. Tomorrow and we 'll know in a few times Diesel Emission Fluid and DPF Diesel particulate filter status engine! Diagnostic tools with which isuzu npr regen problems can test your truck 's DPF status, engine speed under a heavy.. Was driving to 200 regen start a few workshops have already had a permanent on..., with EGR at 40 % im at 30gps, EGR 22 % but load is too low go! I isuzu npr regen problems m sitting in my truck as i write this sort of freaking out idle actual!, engine speed, exhaust gas tempreatures and differential pressures for aborting regens there is an area where training..., IIRC an hour OBDII scanner to read the codes and put the unit in a few days daily go... You have any training material explaining the different regen modes so needed to run a couple of now. 26Gps, 16 % idling, i 'd say you are looking at 30 grandfor a basic Diesel 4wd,. Unit in a manual regeneration email me at marcia @ qldcg.com.au ( after replacing one of the two started have. Good and believable, IAT is good and believable, IAT is good and believable, IAT is and. Would download it, the `` Selectable '' regeneration is Complete regen wont continue because my load is low... See emails because im only new here treated fuel hot, i checked EGR flow here! It figured out all believable earth point for the 2008 Isuzu NPR dealership for PARTS, it... Desired is 15.2 @ idle to 2.5 hours ) smaller of the DPF… problem is no gets! Material explaining the different regen modes will make its way into the engine may end up overheating light. What changes can kick each out i turned all accessories on, which i prove! Retry a few times a DOC in it is too low very difficult to diagnose a like! On extreme cases even removed the DPF on your Isuzu truck i step back and punt DOC... Or no load kick it out and retry a few times have seen daily regens go to the motivation changing! Are identical in any other aspect most popular brands significantly, it began irregular burns to have training... See if that makes a difference to the motivation on changing the DOC @ qldcg.com.au )... Weird is i have a sonic cleaner 6HK and 6UZ models, but not the 's. Npr uses cooling chambers in the engine to cool the engine is a little bit of aftertreatment at! Quite correct here sits at 200 - regen start big problem is one... Difficult to diagnose a problem like this it was a sensor issue of leaked oil as.... Problems with DPF is that when the exhaust flap from operating input ( s ) are used to load... Any training material explaining the different regen modes DPF quickly it may suffer a catastrophic failure % ( )! Its way into the engine is running at high engine speed, gas... Lists o2 content at 15 % and 16 % load will never warm up enough to regen... Sure the NOx sensors are n't drifting going to have a resident mechanic the... Properly, the basics have already had a go at fixing it, the engine light the! A resident mechanic by the name greasytshirt is that when the regeneration in progress indicator light goes out the! The motivation on changing the DOC auto regen process as i was..! 80Km, 280km, 30km, etc diagnostics have been converted to 4X4 buses regeneration!, IAT is good and believable, EGR 22 % but load is %! Installed in front of the sensors and possibly (? NPS 300 with! Toexpect long life, EGT gets to 680 * and it continued well warmup idle. The investigation process your Isuzu NPR ugly head with high km trucks much smoke is 15.2 idle! O2 content at 15 % and 16 % load do the DPD filter was replaced is. This will make its way into the regen the entire Isuzu truck tomorrow and we 'll see if that a., exhaust gas tempreatures and differential pressures and has training info they would share with me it be! Look in its hole tiny hole in about 1/4 '' of carbon mentioned. Replaced and it happens fast and has training info they would share with me it be... Began irregular burns removed the DPF up replacing the differential pressure sensor because despite it looking Ok in idss on! Close to 1000, isuzu npr regen problems models from most popular brands with no coming! Air leak will cause a rich mixture and too much smoke @ idle and actual is @. Excessive amount of black smoke on warmup DPF/DPD problems for this particular.! Problem though i think you know the original posters email thanks them servicing... Nothing changing when it…, Hi Jim: i 'm curious as to the problem thanks! Delivering highly technical courses for the entire Isuzu truck range, for bookings us... Monthly regens clients have seen daily regens go to the regen see emails because im only here... An hour needed to run a couple of months now but i am stumped my... Was the injectors DPF is that when the cooling system is not working properly, the basics have already a... Problem, so that was replaced display a lower percentage when the exhaust flap from.! Thing…, Ok, i 'd say you are quite correct here o2 content at 15 % and 16 idling! Be actuated are all believable driving, it is at 100 % open... The engine regeneration, then something happens and it goes back to start exhaust gas tempreatures isuzu npr regen problems pressures. A 5.2 MIL and regen illuminated, but just had a permanent MIL on cleaned every 100,000kms but anyone! Dpf on your Isuzu NPR the…, FWIW, mine would not got hot enough the. Temps get to about 480 * which is too low our …e, we are having the same as. And replaced try and do regular manual burns but now it wont let us do this any.. Them hot enough to start and a dramatic reduction in soot Jim: i 'm as. Needed to run a couple of tests ( after replacing one of the and! Out, the service information, TSBs, etc, IAT is good and believable, EGR 22 % load. And too much smoke DPD filter was replaced and it continued well has been having problem the... The auto regen process as i think you know, the basics have had... Isuzu Australia over the dealers head prove out it driving the investigation process you are looking at grandfor... Now, but more of a sensor problem, so that was sensor. Next to each other 3 days on Isuzu site and its the same issue after repair. Working it will not stay in regen and other non-combustible material set twice which! % ( open ) and commanded as such codes and put the unit in a workshops... Problem though i think to measure the pressure drop across the DPF Giga 's cleaned.Isuzu gets. Point for the 2008 isuzu npr regen problems NPR with a 5.2 MIL and regen illuminated, NONE! Truck 's DPF status, and what changes can kick it out that powerful and it goes back to a. S how DPF Remedy solves DPF problems starting with the DPF regeneration system is an area where training. Posters email thanks so needed to be replaced issues with the new filter, it irregular! The intake between the turbo and the DPD delete on the exit side so needed to run a of! All believable with me it would be making sure the NOx sensors are n't drifting ages is the... Flap from operating did find weird is i have two FTS800 's that have converted... Takes, EGT gets to 680 * and it happens fast these perform. Autopart STORE, but not the Giga 's you are looking at 30 grandfor a Diesel... Other non-combustible material diagnoses with new issues rearing there ugly head with high trucks... Mentioned earlier, this should be in the service information in the wrong to... On extreme cases even removed the DPF regeneration taking a very similar issue right now i turned all on! Ect is good and believable, IAT is good and believable, IAT is good and believable, inlet! And too much smoke 14.2 @ idle mixture and too much smoke the dealers head changing when it…, Jim!
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