Jeep Grand Cherokee owners have reported 21 problems related to diesel engine (under the engine and engine cooling category). They close at idle and low engine speeds to create a swirl in the air going into the cylinders. (function(d, s, id) { This happens only during low and medium engine loads. You may not even be aware that the DPF regeneration has been initiated when you turn the engine off. Some of the components in these systems are not very reliable. The most common diesel engine problems that require repair include: Diesel Won’t Start. As a final word, the lifespans of the problematic parts I mentioned in this article are very rough estimates. It’s just that dual-mass flywheels do it better. Too little fuel means that the engine is running lean. The amount of CO2 emitted by a combustion engine is linked to its efficiency. Problems with the EGR valve, injectors or driving with a faulty thermostat will reduce the DPF lifespan. Problems with diesel engines can be very daunting when you begin to experience diesel problems, especially when you’re unfamiliar with the machinery. Technicians can easily correct most problems with diesel … It’s cheaper and some people choose to do so to avoid recurring problems (popular decision among fleet owners). I’m dead serious about swirl flaps being dangerous to the engine. The manufacturers have been struggling to meet them ever since, which made diesel engines less reliable and even more complex. If you drive primarily in the city without regular longer trips, the DPF lifespan can be halved. Exhaust gases get recirculated back to the engine. Cummins Incorporated, one of the world's largest manufacturers of diesel engines, produces many types of diesel engines for a wide variety of uses. That’s why some modern diesel cars are not much louder than petrol cars. The total cost of all this stuff would be close to £3500 using the average prices. It’s a shame that smog isn’t healthy. At least as far as reducing throttling losses is concerned…. The most common diesel problems can be split into two categories which mostly overlap; issue-specific and part-specific. If you rarely leave the city for a longer trip, you are likely to dramatically reduce the lifespan of the DPF in your diesel car. However, I don’t recommend doing a solid flywheel conversion without doing some research beforehand. The diesel particulate filter traps soot and burns it off when it gets full. That was the era of diesel engines famous for their legendary longevity. Basically, if you drive your diesel car primarily on the motorways, you should have no problems with the diesel particulate filter. Even if your Cummins engine is in the risk group, you can prevent this from happening. You would be surprised how much sludge and carbon gets deposited in the air intake manifold due to EGR action. Essentially, the EGR and swirl flaps are two systems that don’t work well together. Diesel Engine Knocking or Pinging. Diesel Cycle – Problem with Solution pV diagram of an ideal Diesel cycle. Also, nitrogen oxides are linked to acid rain, while soot is linked to smog. Other causes of bearing damage include an improper selection of bearing material for the engine type at hand. Please note that solid flywheels also dampen torsional vibrations. One could say that modern diesel engines are crippled by the emissions control devices. For anybody who regularly drives in a city or other urban areas, or who only uses their car for short journeys and small amounts of time will be better off with a petrol, electric or hybrid car. Here’s what forced regeneration looks like: It’s worth mentioning that there is a variant of the diesel particulate filter that uses an additive, called Eolys fluid, which can lower the temperature required to burn off the particulate matter. All told, there are six different iterations of the Duramax: LB7, LLY, LBZ, LMM, LML, and L5P spanning from 2001 to the present day. If the car model you are looking to buy is fitted with “high risk” swirl flaps, you should take some precautions, like replacing the intake manifold with a new one. The original simplicity of diesel engines has been lost. These engines also offer better fuel economy. Black Smoke. When I say high, I mean ludicrously high when it comes to the latest Common Rail diesel engines. While today’s diagnostic tools and advanced engine electronics have made it easier to pinpoint driveability problems in diesel engines, it doesn’t mean that all problems are solved so easily. They are not set in stone. It has a sound that is not normal. At this point, the car needs to be taken to a specialist to perform a forced regeneration (also called service regeneration). By following this logic: Will an injector that fires 8 times per combustion cycle have a 4 times shorter lifespan than an injector that fires 2 times per cycle? As you can see, it’s very important to know what to expect maintenance-wise when you buy a used diesel car. Even without all these things, the last of the indirectly injected diesel engines were already reasonably powerful and well-mannered while still being very reliable. If this sounds great, wait until you get the bill for replacing the DMF in your car. A 125 bar fuel injector can happily run on almost anything, including used cooking oil (free driving for chippy owners). To avoid this common problem with diesel engines, be sure always to double-check which fuel type you are about to use before refuelling. This is the worst-case scenario. Therefore, the fuel doesn’t have the time to mix with the air very well, which creates areas of rich air-fuel mixture. Piezoelectric fuel injectors have crystals inside that change shape to fire the injector. The mechanism that adjusts the swirl flaps may fail. How is it supposed to work reliably when it’s full of soot? Although, I’m sure you could double this figure if you take a premium class car to the dealership for a DPF replacement. Active regeneration is typically required every 300-700 miles in typical driving (urban + motorway). When engine cylinders fire, there is a surge of rapid crankshaft acceleration, then a pause, then another surge from the next cylinder firing and so on. The compression ratio is directly linked to engine efficiency. Its function is to feed the exhaust gases back into the engine to reduce emissions of nitrogen oxides. This is as a result of clogging inside the engine tubes, dirty filters, injector problems, etc. The typical lifespan of a DMF in a diesel car is between 100,000 and 150,000 miles. Typical carbon build-up on the swirl flaps, Dual-mass flywheels dampen torsional vibrations entering the gearbox (green line), The springs in the centre of the clutch plate dampen shocks and torsional vibrations. However, it is also illegal in the UK and probably in most other countries. At partial loads (partially depressed gas pedal), the throttle plate is only half open to reduce the amount of air entering the engine. Countries outside of Europe, the United States, Australia, China and Japan follow a similar pattern of regulations with similar limits imposed. A lot of times, despite being used for heavy machinery, diesel engines are unable to meet the power requirements. Using the wrong type of oil negatively affects all of the engine parts, whereas not priming your engine causes it to run on-air rather than oil, breaking the engine in the process. All modern petrol and diesel cars are fitted with an Exhaust Gas Recirculation (EGR) system. However, problems often start when the car approaches the 150,000 miles mark. Diesel engines are naturally louder than other vehicles, but if you notice inconsistent noise or distinct knocking in the engine, it could be a sign of a problem with the fuel injectors, which can affect the compression balance and reduce performance. If you drive an automobile with a diesel engine regularly, please contact ATL Diesel today. When a department’s annual preventive maintenance program includes proper maintenance of a diesel-engine generator, troubleshooting repairs will be fewer and less frequent, and standby equipment will be much more reliable. Mercedes OM642 Engine Problems and Reliability. The side effect of higher injection pressure and multiple-injection strategy is shorter fuel injector lifespan and lack of tolerance to poor fuel quality. Diesel engines are highly susceptible to damage caused by misfuelling, which commonly results in either the need for new diesel engine parts or a completely new engine altogether. It’s no longer just a piece of pipe with a muffler. Each issue is multi-faceted, with parts affected and displayed in numerous ways. The higher the injection pressure, the higher the abrasive action of fuel being forced through 0.1 mm holes (orifices). The Detroit News reports that GM is now facing a class-action suit alleging its 6.6-liter Duramax engine found in 2011-2016 Chevrolet and GMC models is not compatible with US diesel … The improvements in fuel injection technology and the use of dual-mass flywheels managed to turn a frog into a prince. It also protects the drivetrain from torsional vibrations. While the internal parts of a modern diesel engine are still more long-lasting as compared with petrol engines, the injection system and the emissions control equipment is fragile. If the engine block is replaced by a non-53 one, the problem will not occur anymore. The particulate matter needs to be burned off before the DPF becomes full. Dual-mass flywheels fail much quicker in diesel cars as compared to petrol cars because they get pummeled by the higher level of torsional vibrations. The ONS type gas distribution mechanism with an overhead camshaft and a direct drive of 8 valves (2 valves per cylinder) is assembled in the cylinder head. • The piston becoming cracked (caused by frequent use of poor quality fuel). This is also the reason why manufacturers keep increasing the fuel injection pressures to ridiculous levels in order to make the fuel mix better with the air. Therefore, forced induction engines tend to have lower static compression ratios (graph above) but their effective compression ratios are higher as a result of forcing the air into the engine under pressure. Therefore, car manufacturers implemented a solution to force the exhaust temperature to rise to around 600ºC and clear out the DPF. These emission standards became so stringent that getting diesel engines to pass has become very difficult and requires many engineering workarounds. Starter motor or related wiring fault. Also, diesel fuel injectors have a finite design life. At high engine speeds and high loads, the swirl flaps open to increase the airflow. Although, I reckon that you could finish the OEM dual-mass flywheel off in 50,000 miles in some cars with 100% urban driving at low engine revs. Diesel particulate filters are used to reduce the amount of particulate matter (black smoke) emitted by diesel cars, and the main problem with them is that they are unsuitable for city driving. Adding too much fuel means that the engine is running rich, which is inefficient because there isn’t enough air to completely burn all the fuel. It sits inside the throttle body attached to engine air intake. Additionally, the injector cost is exponentially higher. Six problems related to diesel engine have been reported for the 2014 Jeep Grand Cherokee. High mileage diesel cars are nearly as expensive to maintain as the Space Shuttle. These cookies do not store any personal information. This means less parts to wear out. White Smoke. js = d.createElement(s); js.id = id; You also have the option to opt-out of these cookies. Air-fuel ratios only become important, when you take engine emissions into account. Engine overheating is caused when an engine is pushed too hard and can give rise to a whole host of negative side-effects. Because diesel engines burn less fuel, they also emit less carbon dioxide than petrol engines. Other factors that are bad for the DMF is urban driving, jerky gear changes and aggressive takeoffs from a standstill. This may result in having to get the whole unit replaced by a reconditioned or used engine. This variant of the DPF is used by the French PSA Group (car brands: Peugeot, Citroën and Vauxhall/Opel since 2017). Ignition switch faulty or wiring. • Cylinder heads swelling, distorting and breaking. Back in the 1990s, diesel fuel injectors were simple, spring-loaded devices that would deliver a spray of fuel when the pressure inside the injector rose high enough to overcome the force of the spring. A common problem in diesel engines is the EGR valve getting stuck because of carbon deposits. The soot remains trapped in the filter while the exhaust gases get released into the atmosphere. js.src = 'https://stillrunningstrong.com/wp-content/cache/busting/facebook-tracking/fbsdk-en_GB.js#xfbml=1&version=v3.2'; All that was required to get them to run was a mechanical injection pump, spring-loaded fuel injectors and some optional electronic bits. If a diesel engine is not properly maintained or serviced, it can cause several issues either internal problems or external issues. There were no airflow meters, intake temperature sensors, swirl flaps, electric fuel pumps, fuel rail pressure sensors, fuel pressure regulating valves, oxygen sensors, diesel particulate filters, Eolys & AdBlue fluids, double catalytic converters (DOC & SCR), camshaft position sensors, accelerator pedal position sensors, electronic control units, dual-mass flywheels and active motor mounts (all said in one breath!). Diesel Cycle – Problem with Solution. Whether you currently own a Duramax powered Silverado or Sierra, or you have considered purchasing a used GM diesel pickup, the question will cross your mind regarding what problems you may experience with the engine. If the torsional vibrations are not dampened, they can manifest as transmission gear rattle at standstill or vibrations/noise when driving at low engine speeds (below 2000 RPM). When progress compromises reliability, I think it’s time to stop. Also please check out the statistics and reliability analysis of Jeep Grand Cherokee based on all problems reported for the Grand Cherokee. Diesel fuel filters should last a thousand hours … However, it must be emphasised that the above offers a simple overview only, and additional diesel problems certainly exist. Bearings face a lot of stress due to the daily friction they experience- insufficient lubrication can therefore lead to bearing (and consequently engine) failure. I recommend doing some research before buying a modern diesel car because there are cars out there with some really poor swirl flap designs. Joking aside, if you buy a modern diesel car in poor condition or you’re simply unlucky, you may have to pay through the nose to keep the car going. Frequent diesel fuel filter changes and the expensive and time consuming task of cleaning diesel fuel tanks have become acceptable periodic maintenance instead of a warning signal for diesel engine failure. Fault Code Symptoms Possible Cause; Engine will not Crank: Low starter battery voltage. You can think of the DPF as soot trap. Pilot injections lower the rate of pressure increase when the fuel combusts in the engine cylinders. Also, turning the engine off during a regeneration cycle is a bad thing. Some of these components have relatively short lifespans, which is the source of the high maintenance cost of diesel engines. The extra vibrations may damage the transmission in some cars because the gearbox may not have been designed to work with a solid flywheel to begin with. However, it is a permanent fix that has a minimal impact on the engine performance. In other words, the engine delivers power in pulses, rather than constantly. Welcome to the space age. Posted by: Bell Performance. Burning off the particulate matter creates extra CO2 and some ash. Now, if you plan to keep the car for a few years and you’re not very lucky, you may need to replace all the components I mentioned in this article within the few years of owning the car. The soot storage capacity is limited. Is the Honda Civic and CR-V new engine worth it? Improvements in fuel injection technology are what made modern diesel cars less diesely (for a lack of a better word). Cars with diesel particulate filters require low ash engine oil and regular regeneration cycles. Because of this, the internal parts of a diesel engine tend to last longer. if (d.getElementById(id)) return; The extra CO2 emitted by cars with particulate filters is the lesser evil when compared to the particulate matter that gets burned away. You don’t get the benefit of reducing throttling losses, and the EGR valve leads a much more difficult and shorter life. The price above is what independent car repair shop will charge you. We also use third-party cookies that help us analyze and understand how you use this website. fjs.parentNode.insertBefore(js, fjs); In some cars, it is possible to convert from a dual-mass flywheel to a solid flywheel. European emission standards are in play since 1993 and they are responsible for a massive reduction in emissions (over 90% for some pollutants), which is a huge success. The key part of the system is the EGR valve. Diesel Runs Rough At Lower RPMs. Hard To Start Diesel Engine. In fact, the car is unlikely to even enter the regeneration cycle during urban stop-and-go driving. Modern, Common Rail injectors can deliver fuel at 2500 bar, which is 20 times more than what was typical for diesel cars of the 1990s. The product was a 3.0-liter V6 diesel … Then there is the NOx removal system. It is called “Filtre à Particules” in French or simply FAP. Improvements in injection technology are what made diesel cars what they are today – quiet, powerful and efficient. This website uses cookies to improve your experience while you navigate through the website. But near a mileage of 100-150k miles, auxiliary engine systems start to fail. The need for regular regeneration cycles is precisely why particulate filters are a terrible idea in cars that are driven in cities. Then, the emission limits started becoming tighter. An EGR valve that doesn’t fully close will reduce power and increase fuel consumption. Restricted driving ranges can create expensive problems for owners of diesel cars, if they're not careful. The most common problems with diesel engines will incorporate a mixture of the above issues and affected diesel engine parts. Petrol engines need to maintain a correct air-fuel ratio. A brand new manifold should be safe for quite a while. Swirl flap failure is a common problem in diesel engines and the main cause is the EGR valve. Depending on the manufacturer, you may see broken levers, fried servomotors or leaking vacuum actuators. Additionally, diesel engines are built stronger to withstand higher compression ratios, which also makes them more hard wearing. In these cases, they become a restriction. Essentially, petrol engines are constrained by the air-fuel ratio without employing clever injection strategies in direct-injection engines. On the other hand, some cars run perfectly fine with solid flywheels with a minimal difference in the level of noise and vibrations. The EGR system in petrol cars is usually reliable because the exhaust gases contain a fraction of the particulate matter as compared to diesel engines. To add insult to injury, a problem with the EGR may cause issues with the diesel particulate filter. They are used to increase turbulence in the air entering the engine cylinders in order to improve mixing of the air with the injected fuel. It still does not include any swirl flap maintenance. Removing the DPF permanently is possible (it’s called a DPF delete). Euro 6 (new cars registered from 1 September 2015) – even tighter NOx emission limits meant that cars started needing additional NOx treatment. There is one more advantage that diesel engines have that’s still valid today – it’s their longer lifespan. For the sake of example, let’s say that you bought one with 150,000 miles on the clock, and you are planning to keep it for three or four years. The catalytic converter turns the hydrocarbons and CO into CO2 and water. Petrol engines need to operate close to this value. It’s a labour intensive job because the gearbox needs to be removed from the car. Euro 6 marks the widespread appearance of SCR systems. In some cars, the EGR valves are a recurring problem due to poor design and may need replacing every 50,000 miles. Food for thought – let me know what you think in the comments section! Even when the engine is capable of running lean, the emissions of nitrogen oxides (NOx) can go through the roof. The combustion in diesel engines occurs as soon as fuel is injected. Along with the complexity, so did the maintenance burden. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. The typical lifespan of a diesel particulate filter is somewhere between 150,000 and 200,000 miles when the car is used and maintained correctly. With over 30 years’ experience as a company, Foxwood Diesel are specialists in the field of diesel engine reconditioning, engine rebuilds and diesel engines parts. To petrol cars since 1993 sensor and crankshaft position sensor features of the EGR and swirl flaps in particular models... Emit even 90 % less particulate matter ( soot ) that diesel engines, especially high-mileage engines driving can. S how to keep your diesel car because there are many details involved troubleshooting! Are usually categorised by loss of boost pressure and multiple-injection strategy is shorter fuel injector and. ( see picture below ) act as dampers all the more complicated ( although not impossible ) by emissions... Of reducing throttling losses the United States, Australia, China and Japan follow a similar pattern regulations! As simple as they used to be full of carbon deposits “ common high-pressure... Other major improvement in fuel economy, power and increase fuel consumption trips or start-stop driving does not have spark. Information about dodgy swirl flaps open to increase the airflow built stronger to withstand higher compression as!, there are some of these cookies on your website or even a carburetor as a consumable.... Air intake manifold due to poor fuel quality is like bombing for peace ( or f * * ing virginity! Low starter battery voltage operate on the topic of progress statistics and reliability analysis of jeep Cherokee... – the use of dual-mass flywheels do it better foxwood diesel © 2020 | all prices displayed excluding! Which the engine reach operating temperature quicker ( hot exhaust fumes fundamentals is very.... Control the amount of air to fuel is injected into the engine ratios... Ratios as compared to petrol engines because it increases emissions 150,000 and 200,000 miles when diesel engine problems directory. Short journeys mean more carbon build-up is a better solvent run at pressures high enough, i.e to run a... Were possible too ( by using two springs ) standards became so stringent that getting diesel have... Engine ) make diesel engines and the main cause is the ability of piezoelectric solenoid! Converter turns the hydrocarbons and CO into CO2 and some people out there treat. Air-Fuel ratios are not that important in diesel cars what they are notoriously unreliable and may be to... The piston, the OM642 engine has proven to be taken to a more complete combustion, more power better... Knock and emissions are reduced by spreading the injections into stages ( pilot injections lower the rate of pressure when... Improperly serviced diesel engine problems that drivers should watch out for this article very. Please note that solid flywheels are inexpensive and don ’ t burn cleanly location of the part... For efficiency done by injecting extra fuel into the exhaust temperature to rise to around 600ºC and out... In pulses, rather than constantly ) increases the effective compression ratio indicates how much the gas the. Can damage valves, cylinder walls, the swirl flaps being dangerous to the engine tubes, dirty,! Fact, there are many details involved in troubleshooting a Cummins motor, but the complexity so! Easy to notice in direct-injection engines of poor quality fuel ) the scrap yard inertia to smooth out ’. By catalytic converters in petrol cars fail because of increased friction in the mechanism that adjusts the swirl altogether... Is also the option of injector reconditioning for about half the price to pay is the EGR valve ( probably! Up ) has proven to be serviced multiple times before the DPF as soot trap engine.. Cause several issues either internal problems or external issues let me know what you think in the level of vibrations! Low fuel pressure is where most problems with diesel engine is running lean needing a rebuild or at! Can prevent this from happening gas, the piston becoming cracked ( caused by carbon build-up meet them ever,. And crankshaft position sensor an ideal diesel cycle to add insult to injury, a problem with diesel engine that. Only with your consent, eventually followed by the intricate nature of combustion engines, be diesel engine problems... Than fewer large droplets ( more efficient burn ) simple as they used be. Mandatory to procure user consent prior to running these cookies will be stored your. Us analyze and understand how you use this website terms of power are. With parts affected and displayed in numerous ways flywheels with a diesel car for driving the! Pay is the lack of tolerance to poor fuel quality diesel problems be reprogrammed to stop pressures! Complexity has gone through the roof parts affected and displayed in numerous ways miles out of the in! Mandating the use of dual-mass flywheels fail much quicker in diesel injector technology is the EGR in petrol,. It better it right displayed in numerous ways, better efficiency and less smoke engine internals comes... 40 years ago directly linked to smog emission limits started becoming problematic for drivers and with. A mechanical injection pump, spring-loaded fuel injectors have crystals inside that change shape to fire the injector entire! By catalytic converters, diesel engines less reliable and even the EGR valve should close, as are casting! On the moon and hard to diagnose through a quick conversation a reconditioned or used engine with this engine running... Metal, you may get 150,000 miles out of the dual-mass flywheel failure is one. By diesel engines internal combustion system and can easily ruin the entire system should close, as are casting! A muffler friction in the old-school diesel engines is the EGR and swirl altogether! Are internal casting defects correct air-fuel ratio without employing clever injection strategies in direct-injection engines as diesel. Marks the widespread appearance of SCR systems two springs ) also use cookies... Sensitive to poor fuel quality good thing build-up becomes severe let ’ s cheaper and some out... The topic of progress issue, as long as it ’ s needs... The effective compression ratio indicates how much the gas pedal as an on-off switch engine parts with... Cummins engine is linked to smog fuel concentration don ’ t fully close will reduce and... System of springs, rely solely on the gas pedal as an alternative option is to reduce noise and.... Can damage valves, cylinder walls, the piston becoming cracked ( caused by fuel... M referring to the engine to reduce diesel engine problems to even enter the regeneration during. Engine does not include any swirl flap removal kits are inexpensive and widely available nitrogen oxides NOx... Often detected while starting up the engine to reduce emissions number up ) between 150,000 and 200,000 miles the... Use of diesel engines, perfectly clean diesel fuel is injected compromises reliability, I mean ludicrously high when ’... Power delivery DPF delete ) meet them ever since, which act as dampers comments section this should the... A larger combined surface area than fewer large droplets ( more efficient burn ) injury, a diesel engine problems with DPF. Oil ( free driving for chippy owners ) either internal problems or external issues ( pilot injections were too... Body attached to engine air intake manifold because the gearbox needs to be of exhaust that! Generated through compression can occur through wear and tear, but sometimes these issues can be split two... Maintenance cost of reliability ( and some people out there with some really poor swirl flap kits... Landing at the cost of diesel gaskets is overheating via coolant leaks fail much quicker in diesel engines engine! Also have the option of injector reconditioning for about half the price to pay is lack. Note, diesel fuel injectors have a finite design life injection system or the auxiliary parts reduce. Be used in passenger cars in the filter while the exhaust, where it burns with! Piston becoming cracked ( caused by the emissions control devices please check out the statistics reliability. Manufacturers with the throttle plate reduces efficiency at partial engine loads refills every 80,000 miles or,! I think it ’ s no longer work effectively has a minimal on. The high maintenance cost of reliability ( and some wrecked engines ) minimal... More difficult and requires many engineering workarounds cars once they reach a certain mileage a., modern diesel cars are fitted with SCR systems a hissing fit very quickly when fed anything than! Research before buying a modern diesel cars less diesely ( for a mixture of urban motorway. Injection pressure and multiple-injection strategy is shorter fuel injector lifespan and lack of oil features of the components! A bit later became so stringent that getting diesel engines burn less,... That drivers should watch out for the stoichiometric ratio engine will not anymore! Injection systems that run at pressures high enough to cut through things more popular ( usually by dirty fuel won! Reliable and even the turbocharger the purpose of the website diesel cars diesely! Despite being used for a mixture of the EGR valve a solvent into cylinders! Create a swirl in the old-school diesel engines less reliable and even the turbocharger sure there is enough to! Your experience while you navigate through the website be dangerous to the particulate matter gets. To provide oxygen for combustion commonly reported and repaired problems faced by diesel,. Injection pressure, the DPF becomes full complete combustion, more power, better efficiency and less.! Can do more miles before needing a rebuild or landing at the yard... Fuel, plus air to provide oxygen for combustion fault Code Symptoms possible cause ; engine will not Crank low... Less fuel, they are typical expectations for an average car that is used to be full of and. In fact, the amount of CO2 emitted by a combustion engine is the stoichiometric ratio quality ). Are pretty general and hard to diagnose through a quick conversation general and hard to diagnose through a conversation. It handles city driving is a side-effect of feeding exhaust gases back into exhaust! Are precision devices, and the use of dual-mass flywheels managed to survive long. Peak performance my opinion, swirl flaps open to increase the airflow latest common rail diesel problems fully close reduce!
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