Then, and only then, is operator action needed. . If you are having trouble with your Isuzu chassis, Rossetti says to consult with your local Isuzu dealership. I've also seen situations where fuel economy was increased dramatically just by changing the way the vehicle is being operated. Parked regen is a process where we park our vehicle and put it to selective or forced regen. what is brent draper from masterchef doing now isuzu slow regen Isuzu NPR 2012 5.2 diesel. In short, Isuzu recommends a maximum of 5% of biofuel be used in its vehicles. However, if for some reason the regeneration is interrupted, because the operator changes idle speeds quickly or does something else that causes the exhaust temperature to go down, the automatic regeneration process suspends itself until it gets to another optimum regeneration spot. I was the guy that spoke to you over the phone because I have an Isuzu in the shop doing the same thing. There is no question that the systems work to reduce diesel exhaust emissions. I can not find any information about the P1463 code. What is baffling me is it can go active, then something happens and it goes back to start. This truck came in with a p244b - dpf high differential pressure, p2463 - dpf high soot accumulation, p2459 - dpf regen frequency. I'm curious as to the motivation on changing the DOC. I don't have much in the way of answers or opinions. I have 3 Isuzu NPR-HDs that I service for my business. Plus, as stated above, if the operator does most anything to the vehicle's controls during a manual regeneration the green light will go out, indicating the process has been interrupted. I wound up replacing the differential pressure sensor because despite it looking ok in idss, on my autel it looked weird. But I am stumped, my local Isuzu "lead tech" is stumped. However, if they are very short trips that are not enough to do an automatic regeneration, at some point the operators must initiate a manual one. Green Flag attends a lot of cars that have broken down with DPF problems and they are caused by one primary factor: the DPF is clogged with soot because the driver has ignored the warning lamp. This may happen several times; it's not uncommon for a 'good' regeneration record to be that automatic regeneration takes place only 75% of the time. It was popular with small businesses, especially in the cities, and was produced from 2000 to 2003. Check for a cal update? There are three operating states, which are fully automatic regeneration, a manual regeneration and anytime, anywhere regeneration. Technician Service Training. this last go around I did a DOC, EGT1/2, aftertreatment injector, so except for the SCR, the aftertreatment is all new. I step back and punt a DOC in it. It 0probably wouldnt hurt to be able to reset the dpf data as well which you will need a dealer for. FENDT MT 1167 VARIO with 6M TWB ALTERNATOR. What happened is these particles started getting into the intake system. As a general rule of thumb, automatic DPF regen should take around 10-20 minutes and not more than that. Ask for an opinion about your percentage of requested vs. completed DPF regenerations: They will know if you are 'in the ball park' in terms of completion rate. This in turn reduces the harmful exhaust emission that helps prevent the black smoke you often see coming out of the exhaust of diesel vehicles. Answered in 9 They use a press fit dry liner. It will then run a regen and set the learning of the filter and once done, it is ready to go. So it got a sensor and manifold. The KTS will bring up the next screen with particulate filter status, Engine speed, exhaust gas tempreatures and differential pressures. Manual Electrical Schematics Bulletins Scan Too/ Controller Programming DPF Slow Regeneration 200-Regen Mode Start - 226 216 0.36 On - 100 158 84 Press the 'Stop Test' button DPF Normal Regeneration before you . Yes, you can. Hello, I have a 2012 Isuzu NRR with the 5.2L diesel. Select Request regeneration (first selection). Ideally, your vehicle of yours needs to be running at operating temperature. At this stage, Isuzu Trucks these two conditions when the DPF light is flashing. Sometimes, however, this process of regen can be too much of a hassle and we cannot always find suitable safe places to do a routine regen. They are mated to an Aisin 6-speed automatic transmission with double-overdrive and a lock-up converter. Yogyakarta 55284 Telp / Whatsapp: +6281933355055. Thanks for Watching! Unless, I changed the doc, because in my experience, if the thing is dosing and not making fire, the doc is worn out. Diesel Equipment Trading est distributeur officiel de moteurs diesel industriels Isuzu en Belgique, aux Pays-Bas et au Luxembourg depuis 2011. Reduced engine power, also known as the limp mode in some models, means your car won't accelerate even when you step on the gas pedal to the floor. Modify your DPF and other service intervals as indicated by the data. (All You Need to Know), Does Hyundai Tucson Have Leather Seats? Have you run the nozzle and SCR tests? Not very, Hi Jim: Blow Off Valve. 68,000 KM, Diesel, Yogyakarta. Owners in some industries may have many thousands of hours on their chassis by the time they reach 50,000 miles on the odometer. Some tools will have a built-in step-by-step process, or just a simple "yes" or "no" function. In order to do this, the vehicle must be running at a speed of over thirty miles per hour. What's involved in the 3K Calibrations tuning process? Ultimately, the DPF system will become clogged such that the green light will turn yellow, which indicates that a manual regeneration must be initiated. I can take CAC pipes off, put pipes on, open egr, close egr, remove the cooler, nothing seems to change load. Certain precautions are needed to be taken in place when this process occurs. In general, the regeneration will not last more than 20-60+ minutes for most vehicles. I wound up replacing the differential pressure sensor because despite it looking ok in idss, on my autel it looked weird. However, we need to be driving steadily for the process to be complete. Heavy Duty. The diameter of these droplets range from 100 to 200 m. isuzu slow regenvin diesel net worth 2021 forbes. We have the experience to handle your trucking and equipment needs. For people who drive a lot of city traffic/short distances or who often get stuck in traffic jams, it may happen that the regeneration conditions are not met. Can You Clear Coat Plasti Dip? If you have questions about your Isuzu chassis that cannot be answered by your local Isuzu dealer, your next step should be to call Isuzu Customer Relations, toll free, at 866-441-9638. Vikings White Hair Actor, The 2018, with egr at 40% Im at 26gps, 16% load. Anyone out there have any ideas? I had already replaced the exhaust brake a couple of weeks ago, but I did take the cover off and was able to adjust the stop so it would close a little tighter. I don't know if these will perform a forced regen while in gear. It will help you in overcoming any problems that you may face while, Contact us at > [email protected], 2023 Car Dominar | Powered by Car Dominar. Charged 226.67 plus vat. Posted on July 4, 2022 by . "One problem we've seen on a somewhat widespread basis, though," said Rossetti, "is drivers who disregard the lights when they come on. We also have our 4H 215 hp diesel engine in our 14,500- to 19,500-lb. Just out of interest how much were the new injectors? It is a safety feature to prevent further engine damage. Do not perform a parked regeneration on grass or soil as the exhaust becomes very hot and can cause a fire. Probably. Creating transformative strategies, innovative solutions and putting people at the centre of everything we do. Not many drivers know what a Diesel Particulate Filter (DPF) is - until it costs them serious money. "The idea," said Rossetti, "is not to penalize the driver. Furthermore, on the MID of the car, we will see either regen on progress or parked regen selective button will be emitting red light. In this instance the vehicle is typically operating at a slow speed of less than 80 km/h. . The HEST light may remain on, Vehicles that run for significant distances at a lower speed, such as parking lot sweepers, have an exhaust system that is too cool to allow a regeneration. That doesn't mean it will break every time. We have a variety of Vauxhalls at work, including 1.7 Isuzu CDTi based engines and 1.6 Whisper diesels. If you own a diesel car manufactured after 2009, it will feature a device called a Diesel Particulate Filter (DPF). This would be especially helpful for parking lot sweepers that are being taken out on a similar route every night. They all make white smoke when regenerating. You are using an out of date browser. If we take the car on a highway drive and drive as usual that will be the best. Yard Tractors, Local Tractor, Regional Tractor, Long Haul Tractor, Off Road Severe Service, Day Cab, Sleepers, Flat Roof, Hi Rise, Sky Rise Tractors, Refuse / Mixer / Roll Off / OTR / Long Haul / Regional / Bulk Delivery Cab Style - Isuzu - Crew and standard cab, International - Crew and standard cab trucks and day cab, low rise , hi-rise and sky rise tractorsFord - standard, double cab, and crew cab. Diesel particulate filters have a catalyst in front of them that generates heat. 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. What criteria must be met for each stage of regen, and what changes can kick it out? I have a bunch of questions though. The DOC may have a separate issue, or it can be a software issue (did you check for possible updates?). Also, don't use EventPriority.MONITOR, as you are modifying the event. 3 Indicators of a successful forced DPF regen. It is strictly not recommended to start driving before we complete the regen process. Isuzu learned that in those situations, if the amount of oil in the crankcase was reduced by 2.5 quarts it would limit the amount of oil that would end up in the intake system. If your drive your BS6 diesel car once or twice in a month for long rides (more than 100km atleast) then you may not face the DPF issue frequently. The def level is 97 percent the pm level is 0. we have performed slow regen a couple of times. There are generally three different ways of regen. the injector). ), Can You Clear Coat Over Rustoleum? The system is absolute and always reacts the same way regardless of what might cause us to not regen. In the case of an Isuzu truck, the optimal conditions for the engine to regen are having it parked with operating temperature, we press and hold the DPF switch for 3 seconds. Address:South Suburb ChengLi Automobile Industry Park, SuiZhou City, HuBei Province, China. "We have some people who think they have to pull over or some such when the green light comes on," said Rossetti. The following information is based on an audio podcast interview held in May of 2014 with two of the top managers of Isuzu Commercial Truck of America. Isuzu NPR 5.2 Limp mode. Sur tout terrain, avec ou sans remorque. It does mean that you need to start heading to a fueling station. Hmm, it is at 100% (open) and commanded as such. Just another site. About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright . If regens are interrupted repeatedly, though, at some point the yellow light will come on signaling that a manual regeneration New info. I mean like 20-warmup, 200-regen started, 220-temp rise, 370-regen active those modes. I would download it, just in case Scott has to pull it. I have done many forced regens on these trucks, but never tried in gear. Have they checked the injectors do you know? I'm curious as to the motivation on changing the DOC. At this point the yellow light indicator light will stay visible for quite a while, and it will be able to resolve. The biggest struggle I have had with forced regens on these is getting them hot enough to start. From there, the exhaust works its way through the selective . I get it together and try a regen. Isuzu Technical Center of America, Inc. (Isuzu) is recalling certain model year 2014-2016 Isuzu NPR and NPR HD vehicles manufactured August 26, 2013, to November 11, 2016, and 2016 Chevrolet Low Cab Forward 3500 and 4500 vehicles manufactured July 27, 2016, to November 11, 2016. Regen is also known as the regeneration process. Like, Comment, Subscribe. Im out of ideas, Does this one have the exhaust brake by the DPF? It isn't thread safe, so you should keep it in the same thread. The following are some common issues and tips for repairing your Isuzu NPR. Isuzu and Ford have gas engine options. In 2011 the EGR was improved with extra cooling and the fuel injection pressures were I kick it out and retry a few times. When the light comes visible, the driver has to allow the driver to rebuild, or change the engine load of the vehicle so that the rebuild can be run at the time of need. Should be around 20% at idle. When a chassis owner gets their 'health report' from their Isuzu dealer, they need to make sure to note the number of hours on the unit, not just the miles. The Isuzu NPR is a light/medium duty cab over truck. How to do DPF regeneration in TOYOTA INNOVA , TOYOTA FORTUNER AND TOYOTA HILUX Cars? The filter removes a lot of the DPMso much so, you could place a white handkerchief over the exhaust pipe and it would stay white. Powerful DPF functions+Engine Oil Light Reset ANCEL HD3200 heavy duty truck scanner diagnostic tool support FUSO HINO UD Volvo Isuzu Hyundai and KIA do oil light reset and DPF functions including DPF Normal Regen, DPF Automatic Regeneration, DPF Slow Regen, DPF Status Resetting, Clear DPF Data etc. Isuzu truck DPD regen problems - can anyone help? It may not display this or other websites correctly. If the car is brand new the process will take less time and if it is old, it will take more time. I take out the aftertreatment injector to make sure it atomizes, and look in its hole. Regened for me a. Mlati, Kabupaten Sleman, D.I. (Quick Answers), Can You Flat Tow Kia Soul? The indicator light in yellow of the DPF will flash an indicator light that flashes. According to Rossettit, the overall chassis industry average is to have about 33 miles traveled for every hour of vehicle usage. Changing a DPF 2008 Isuzu NPR 5.2. As I think you know, the service information, TSBs, etc. This process of regeneration refers to the soot being burned away with a high temperature in the Diesel Particulate Filter (DPF). Posted on February 18, 2021 by 0 Comments February 18, 2021 by 0 Comments When the process of the regen is complete the engine idle speed will come down and the red light or the message on the MID will go away. Or it could be a combination of things or a performance issue. According to Rossettit, the overall chassis industry average is to have about 33 miles traveled for every hour of vehicle usage. If the truck hasn't just been driven, They wont regen in gear. The same with when the yellow light comes on; you need to start thinking about regeneration. f01.justanswer.com/diesel3153/95d.pdf The regen has concluded when the engine returns to slow idle, and the DPF light remains out. is in the tool. June 11, 2022 Posted by: grady county, ga zoning map . If you want to maximize the mileage and engine hours between the required deep burn cycle of your DPF (Diesel Particulate Filter), then make this part of your morning DOT walk around. What is baffling me is it can go active, then something happens and it goes back to start. But once cleared it never came back. You will also most likely will need the gasket kit. They'll ignore them to the point that they end up in "limp home mode" and that is not what anyone wants to occur.". 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. 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. I have the Isuzu scan tool and I tried to force a regen and after 40 min of trying the tool report Regen Inh Have a 2012 Isuzu npr ran slow regeneration and truck kicked out and threw a p0420 code. Isuzu takes pride in the technical expertise that ensures the Isuzu product is the best in the marketplace. STEP ONE: Before initiating Parked Re-Gen, make sure the following 4 conditions are met: DO: place truck in neutral This reduces the soot burn temperature to 350-400Ca temperature readily reached by engines under even light loads. Copyright 2021 Radical Collaborations Mins theme by. He was quite sure of himself. This type of regen has three distinct types of regen, where one is active, the other is passive and the latter is forced. It's been a couple of months now but I was involved with a 2016 or 17 NPR for aborting Regens. Once the DPF becomes blocked, the car will usually go into Limp Home Mode until the problem is fixed. Archive View Return to standard view. I did have a p0172 code set twice, which I cant prove out. Remember: Once the chassis light turns yellow, there are an indeterminate number of miles of operation left before the red light comes on. I did have a p0172 code set twice, which I cant prove out. It is clear that you are not getting to temp for diesel dosing, I have tried driving the crap out of them and forcing a regen too, but if whatever gets the exhaust hot (VGT, throttle blade, etc.) If I take, There is a little bit of aftertreatment added at the end. Does that raise the engine load? It's at 800,000k now and the DPD filter had soot on the exit side so needed to be replaced. land o' lakes high school homecoming 2021. maison d'amelie paris clothing. Not very, Hi Jim: I am unable to perform a manual regen. Got a Raytek? How To Install Act Ffxiv, If we proceed to not regen our vehicle then eventually our vehicle will get stuck in a derate and that will then shut down the engine. (Explained). Engine load is too low and will run regen once I turn on a/c and headlights/wipers. The process involves the soot within a diesel particulate filter in other words DPF is converted to ash with the use of chemical reaction, heat, and or electricity. Page 45 55702_Sec02-1_'08 08.2.12 9:45 AM Page 17 LEFT-HAND CONTROL LEVER The turn signal lever on the left side of the steering column also controls headlight low beam and high beam. Be sure to go through your own vehicle Owner's Manuals for complete details. 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? However, operators need to be well trained about what to do when the yellow light comes on, especially if they will not be traveling at highway speeds soon. 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. When we start the parked regen system the car the engine idle speed increases. That was the reason Isuzu changed the dipsticks, not because of regeneration issues. What i did find weird is I have 2 trucks next to each other. I pulled the cover off and seen it wasnt reaching full stop/closed position so removed it and tested off the truck and sure. Sign up to receive updates and training offers. In fact, with over 80,000 visitors per month, our site is by far the most popular expedited freight destination on the Internet! Engine Load TIC: Isuzu is a member of the Truck Industry Council - Safer Greener Essential. If that doesn't occur automatically, though, the soot will build up and that will increase the back pressure. Just a follow up to this, we are still having issues and are very stuck now. mine doing the same so I have had enough and sold it. I have a 2013 Isuzu NPR 5.2 diesel that is in limp mode def fluid was empty can not force regenerate because there are two codes . If anyone out there is an Isuzu tech and has training info they would share with me it would be appreciated. At that level, two seconds of braking can recover enough energy to drive for 700 metres (0.4 miles . 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 mean like 20-warmup, 200-regen started, 220-temp rise, 370-regen active those modes. Our International, Ford and Isuzu brands are the best in the industry. Isuzu NPR regeneration Diagnostic Network. . First, thread safe =/= will work. Furthermore, this often happens and is done by the DPF, the diesel particulate filter which goes into a passive regen when it deems necessary during steady driving. Anyone out there have any ideas? DPR regeneration takes approximately 15-20 minutes. I didnt know which values to trust so i swung it. We cannot leave the vehicle, the power-take-off (PTO) should be turned off and never touch the DPF area since it will be very hot. Jim Technician Dover, New Jersey Posted Latest . What i did find weird is I have 2 trucks next to each other. But when it DOES go regen active, that value isn't any different. PM him your situation (cut and paste) your OP and you should get a quicker response. Those exhaust pipe emissions were soot. Tel : +86 133 2988 5001 At this stage, Isuzu trucks these two conditions when the DPF light is flashing. Ones a 2012, ones a 2018. Regen is a process in which it eliminates the health risk of our truck from soot build-up. I poke through and clean it. . This truck came in with a p244b - dpf high differential pressure, p2463 - dpf high soot accumulation, p2459 - dpf regen frequency. System goes 200 - regen start. 2012 Isuzu NPR-HD 5.2L (6 4HK1) Will Not Complete A Regen. Then, when the red light comes on, you really need to think about regeneration. It scored a performance boost and specification changes in 2017 and upgrades in 2018 and 2019. fascinator trends 2021; wild wonderful off grid 1 to 50 In conclusion, you now have a good overview of how your DPF system operates. I was hoping a forced regen would take care of them. Pull over safely on a paved or gravel surface. Rather than after every shift, Rossetti said they have been successful with a number of sweeping companies via recommending a selectable regeneration be initiated once per week. Save my name, email, and website in this browser for the next time I comment. There may be small variances, but in general, this is the amount of time it should take for the exhaust temperature to build up in all the components, for the 7 th injector to start injecting diesel into the . I perform a forced selective regen. - Car Dominar, Pingback: How to do DPF regeneration in Hyundai Cars? ExpeditersOnline.com is a registered trademark of On Time Media, LLC. However, if the operator starts going too slow for the regeneration process at any time during the 20 or so minutes needed, the light may go off again without a regeneration taking place. Cela permet une exprience de conduite stable et confortable qui est unique dans ce segment de vhicules. I didnt know which values to trust so i swung it. This kind of situation occurs usually when the vehicle is in a fast speed range (above the speed of 80 km/h), and continues to maintain regular and secure driving situations. This is not a failure. Are you working towards net zero emissions by 2040? DPF may also clog more if your drive is mostly limited to hilly areas (in ISUZU it is called DPD diesel particulate diffuser instead of DPF) . As a result, soot can build up to an excessive level. And replacing one can cost 1000 or more. We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. This proceedure can be done is a fast or slow mode, ( Slow mode can take up to 2.5 hours). Thus, it will clean our DPF and that is how we can do a forced regen while driving. To maintain a truck engine properly we need to do routine regens. Your email address will not be published. (Explained). Industrial vehicles of the Japanese manufacturer have a particulate filter system that is called DPR (Diesel Particulate Reduction). The DPFs color is green and there is no manual intervention needed at this point. In this moment you must immediately get away from the road, avoid flammable and explosive, and explosive objects. If your organization has had similar issues with the newer Isuzu chassis, and they were not addressed in this article, be sure to let us know so we can see about adding the information. For a better experience, please enable JavaScript in your browser before proceeding. If the indicator light turns amber the indicator light, this means that the manual rebuilding process is needed. Because both street sweepers and parking area sweepers spend a significant amount of time traveling at speeds lower than 30 mph, the sweeping industry is a prime example of one that might need to learn the more complicated intricacies involved in initiating manual regeneration of the DPF systems in its sweeper fleet. However, if the parked regen of your vehicle takes longer than expected then there must be something wrong with the vehicle. Isuzu DPD Problems? In this process, it works in such a way that during normal use of the vehicle the particulates that are released by the engine will be retained by this filter. The minimum duration for the drive is 20 minutes at approximately 60 - 90 km/h (45 - 60 mph) but could take up to one hour. These models have two types of engine - a 150 hp 3.0L and 215 hp 5.2L. In the modern diesel exhaust aftertreatment system, diesel exhaust fluid (DEF) solution is injected into the exhaust stream in a spray of tiny droplets. Furthermore, it also depends on the age of a car too. Contractors Report Isuzu DPF System Troubles by Ranger Kidwell-Ross. Daftar harga. Just attach the tool to the DLC and access the module's function to clean the DPF. Hello, I have a 2012 Isuzu NRR with the 5.2L diesel. The parked regen is now in process and should take 40 minutes to complete; Make sure you do not push the key in the ignition to the off switch, depress the clutch, release parking brake, or put truck into gear. Isuzu takes pride in the technical expertise that ensures the Isuzu product is the best in the marketplace. If needed, the system will regenerate, thus minimizing the possibility a manual regen will need to be done during the rest of the week. Is the EGR working? In our previous story, one of the contractor's problems with his chassis DPF getting plugged turned out to involve his chassis having been outfitted with the wrong dipstick. Here is the training manual I have, maybe you can find something in there I missed. Nothing happens. Keep in mind that the green light may come on signaling an automatic regeneration is trying to take place. These are all ways to keep more money in the owner's pocket. This is from an older Isuzu training manual: What criteria must be met for each stage of regen, and what changes can kick it out? on The best in wrecker trucks Isuzu FVR 10 tons flatbed tow truck, on Isuzu FVR 12tons fuel bowser truck Design & Construction, on The Isuzu FTR The Worlds Most Advanced 4X4 Off-Road Water Truck Review, on Isuzu small refrigerated carriers manufacturing process evaluation, We are china Isuzu water truck, fuel truck, garbage truck, dump truck, vacuum sewage truck, tow truck, crane truck, refrigerated truck top manufacturer, The best in wrecker trucks Isuzu FVR 10 tons flatbed tow truck, Isuzu FVR 12tons fuel bowser truck Design & Construction, The Isuzu FTR The Worlds Most Advanced 4X4 Off-Road Water Truck Review, Isuzu small refrigerated carriers manufacturing process evaluation. Hey Jon we have a resident mechanic by the name greasytshirt. If we do not complete a regen and make a lot of regen failures, this will ultimately lead the engine to derate and will be stuck there. wtf. Starting in the 2008 model year, Isuzu trucks have a 'Vehicle Health Report Feature' added into the chassis system. ziegenfelder popsicles; best college marching bands in north carolina; halimbawa ng positibo at negatibong pahayag. "They don't; just operate the vehicle normally because it's doing what it's supposed to. And Isuzu? If the yellow light comes on you need driver interaction somehow, but until then I recommend not paying any attention to it.". Is the EGR working? You are using an out of date browser. Untrained operators may think "Oh, now it's okay to continue driving or otherwise operating the vehicle and the regeneration will continue behind the scenes." This is a regen mode that happens when we do not regen a truck and this process initiates automatically. Temps get to about 480* which is too low for the aftertreatment injector to be actuated. The KTS will bring up the next screen with There is no question that the systems work to reduce diesel exhaust emissions. Hello, I have a 2012 Isuzu NRR with the 5.2L diesel. After the fine particles are cleared and the indicator light is turned off, it will disappear by itself. "We have some people who think they have to pull over or some such when the green light comes on," said Rossetti. Here is a tip to help speed up regeneration when switching between tabs: 1) The LAYOUTREGENCTL command can improve performance by controlling how the display list is updated in the Model and Layout tabs.