While emissions from petrol engines can be dramatically reduced by catalytic converters, diesel engines require a lot more exhaust after-treatment. Not to many around with the Diesel engine, here is a gorgeous one owner, no accidents really really clean GLK 250 AWD , comes very well equipped with panoramic sunroof, heated leather seats, winter and summer rims and tires, power seats, power tail gate, summer and winter matts, three key, manual and so much more. From that moment on, car manufacturers have been increasing injection pressures and reducing the diameters of the orifices in the fuel injector tips. 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). In a way, actively regenerating the DPF is like bombing for peace (or f***ing for virginity). Cars with diesel particulate filters require low ash engine oil and regular regeneration cycles. There is also the option of injector reconditioning for about half the price of a new set. A 2500 bar fuel injector will throw a hissing fit very quickly when fed anything else than good quality, perfectly clean diesel fuel. Additionally, diesel engines are built stronger to withstand higher compression ratios, which also makes them more hard wearing. Find: Ford Focus at the best prices. These can provide equal low-end grunt power with a … However, I don’t recommend doing a solid flywheel conversion without doing some research beforehand. This 2020 Ram 1500 is for sale today. Don't buy diesels for low mileage or inner city life. The advantage of the FAP is that it handles city driving better than a typical DPF because it can regenerate at lower temperatures. 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. To add insult to injury, a problem with the EGR may cause issues with the diesel particulate filter. That means the opposite is also true. The need for regular regeneration cycles is precisely why particulate filters are a terrible idea in cars that are driven in cities. What does the DPF warning light mean? Here’s how to control a diesel engine: That’s pretty much it. Too little fuel means that the engine is running lean. Because of this, the internal parts of a diesel engine tend to last longer. 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. This has led to some motoring experts warning low mileage or mainly urban drivers that they should not to be tempted away from petrol cars by better diesel fuel economy figures. This creates a vacuum in the intake manifold because the engine is trying to suck in more air than it is allowed to. If you liked this article, please share it with your friends! 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? scotia. Affects: petrol and diesels - but more diesel cars will be affected (Euro 6 is the minimum standard for diesels; Euro 4 for petrol) 2023. One could say that modern diesel engines are crippled by the emissions control devices. In other words, the combustion moves closer to “burning” and further away from “exploding”, which makes the engine sound smoother and quieter. There are very few people that use their cars only on the motorway. There is generally less wear and tear with low mileage cars, as long as the car has been cared for properly. In these cases, they become a restriction. We have 163 cars for sale listed as: ford focus diesel low mileage, from £1,395 The engine is even aesthetically perfect. The black smoke that you sometimes see behind diesel cars is the particulate matter (soot). Here is a list of 16 best mileage cars available in India in the price range of Rs. Here's everything you need to know if you own a diesel or are thinking of buying one You control the amount of fuel added by the fuel injectors and make sure there is enough air to burn it all. bodywork all good and clean, I've spotted one small blemish near the filler cap. This website uses cookies to improve your experience while you navigate through the website. In a diesel car, you can treat the dual-mass flywheel as a consumable item. Reason: Well - a new car takes time to accustom - the Engine, Piston, Fuel Lines - all takes time to lubricate and initial mileage will be low Do you notice any similarities? Some of the components in these systems are not very reliable. The price above is what independent car repair shop will charge you. Low mileage diesel drivers may be wasting their money. The purpose of the dual-mass flywheel is to reduce noise and vibrations in the cabin. 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. Peugeot 3008 Exclusive Diesel Automatic 5 Door Pan Roof wooo. if (d.getElementById(id)) return; Modern diesel cars are great when they are new. Also, diesel engines can operate at higher boost pressures than petrol engines because too much boost (or too high compression ratio) makes petrol engines susceptible to destructive knocking (detonation). The first major change that Euro emission standards introduced was mandating the use of catalytic converters in petrol cars since 1993. As for diesel engines, emission limits started becoming problematic for drivers and manufacturers with the introduction of Euro 4. It still does not include any swirl flap maintenance. LeasePlan, the vehicle leasing company has previously compiled the following list of frequently asked questions about DPF's': Does my Vehicle have a DPF? 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. It's diamond black crystal pearl in colour . Problems with the EGR valve, injectors or driving with a faulty thermostat will reduce the DPF lifespan. How bad can it be? It may get technical at times. Low mileage cars do rust. If you are doubtful, get expert advice. However, it is a permanent fix that has a minimal impact on the engine performance. This category only includes cookies that ensures basic functionalities and security features of the website. They are the source of particulate matter (soot) that diesel engines are infamous for. Find Mercedes at the best price. At high engine speeds and high loads, the swirl flaps open to increase the airflow. electrics all working electric windows and mirrors. Burning off the soot is called regeneration. Let’s say that the fuel injector can only fire 1000000000 times (I made this number up). Most diesel car owners are wasting money - because they don't do enough miles to get the benefit from their engine, according to … The idle RPM rises and the engine dumps fuel into the exhaust to burn off the soot – all in the name of ecology! The total pollution is higher. These cookies do not store any personal information. Look for higher mileage, well-made used cars with excellent longevity ratings. The EGR system recirculates exhaust fumes during idle, low loads and low RPM. Trade-in, One Owner, Non-smoker, Local, Low Mileage! The springs in the clutch plate (see picture below) act as dampers in cars with single mass flywheels. However, success comes at a price in this case. Dual-mass flywheels make cars smoother and quieter. They are at their most efficient on long journeys and have particular problems when being driven on short journeys at low speeds. Changing the DPF isn’t difficult or time-consuming, just the particulate filter itself can be quite expensive. Ford Aspire. Incorrect tire pressure is a common cause of bad gas mileage. You also have the option to opt-out of these cookies. I’m dead serious about swirl flaps being dangerous to the engine. The amount of CO2 emitted by a combustion engine is linked to its efficiency. Low Mileage Reason in Brand New Car. Also, a tightened NOx emissions limit meant that some cars had to be fitted with NOx traps, which proved to be not as effective as expected (VW emissions scandal). Also, some cars were already fitted with SCR systems, which were used as an alternative to NOx traps. They close at idle and low engine speeds to create a swirl in the air going into the cylinders. A traditional single-mass flywheel is a solid piece of metal that relies on its inertia to smooth out engine’s power delivery. Explore Diesel cars for sale as well! The throttle plate reduces efficiency at partial engine loads and these losses are called throttling losses. This isn’t a problem of diesel engines per se, but if you are considering switching from a petrol car or already have another petrol car in the household, it’s worth keeping in mind. When the time to replace the DPF comes, it will typically cost between £500 and £1500. Depending on the manufacturer, you may see broken levers, fried servomotors or leaking vacuum actuators. However, keep in mind that not all modern piezoelectric injectors can be reconditioned. Also, many small droplets have a larger combined surface area than fewer large droplets (more efficient burn). As a car owner, it used to be the norm to schedule in an oil change every 3,000 miles. Air-fuel ratios only become important, when you take engine emissions into account. In fact, the car is unlikely to even enter the regeneration cycle during urban stop-and-go driving. Urban driving is usually the problem. Active regeneration is typically required every 300-700 miles in typical driving (urban + motorway). The vehicle's computer determines when to regenerate the DPF based on the amount of soot/particulate matter in the filter. The car still has the original dual-mass flywheel, injectors and even the EGR valve managed to survive this long. Low-mileage, young used cars are usually a bad deal because they haven’t depreciated enough. Many manufacturers introduced the DPF in anticipation for the "Euro 5" requirement so DPF's can be found on many diesel cars from 2006 onwards. Bought a new car, wondering why is the mileage so low in a Brand New Car as against claimed Mileage by Company in between 20 Kmpl to 25 Kmpl. Its job is to smooth out the jerky nature of the engine’s power delivery. Progress is vital, but there is a point where the next small bit of extra performance comes at the cost of a larger chunk of reliability. I will explain in a moment. However, such improvement is bound to come at a cost at this level of technological maturity. 2032. Imagine trying to breathe through a straw. Other Scottish cities expected to introduce Low Emission Zones. Its function is to feed the exhaust gases back into the engine to reduce emissions of nitrogen oxides. As the name implies, their role is to inject diesel fuel into the engine cylinders at high pressures. When the DPF is full it goes through a cleaning phase known as "Regeneration". Swirl flaps live in the air intake manifold. In 2009 the "Euro 5" emissions standard was introduced by the European Union. This low mileage sought after diesel crew cab 4X4 pickup has just 2,466 kms. The result is a loss of boost pressure and reduced engine performance, eventually followed by the “Check Engine” light. Free Member. Comment document.getElementById("comment").setAttribute( "id", "ae734a73ba4cb966e237459e1134642a" );document.getElementById("hbef678ffc").setAttribute( "id", "comment" ); Necessary cookies are absolutely essential for the website to function properly. Petrol engines need to operate close to this value. Active regeneration usually takes 5-15 minutes of continuous driving, ideally at a constant speed. A dual-mass flywheel failure is definitely one of my favourite first-world problems. Welcome to the space age. At some point, it will be so clogged that it will put the car into “Limp Home” mode and illuminate the “Check Engine” light. RTÉ.ie is the website of Raidió Teilifís Éireann, Ireland's National Public Service Media. In my opinion, swirl flaps should not be used in diesel engines. 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. Problems with the EGR valve, injectors or driving with a faulty thermostat will reduce the DPF lifespan. Increasing the exhaust temperature is done by injecting extra fuel into the exhaust, where it burns. Also, nitrogen oxides are linked to acid rain, while soot is linked to smog. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. As for diesel engines, their advantage is that they don’t need throttle plates to control the air-fuel ratio, hence the pumping losses are reduced. You get condensation in the box sections. js = d.createElement(s); js.id = id; Euro 5 (new cars registered from 1 January 2011) – the use of diesel particulate filters became mandatory. Apart from reducing emissions in petrol cars, the EGR reduces throttling losses, which improves efficiency. Here’s a quick summary of what you should take away from all this: Modern diesel exhaust system is a sophisticated chemical reactor. The DPF filters pollutants through small fibres within the housing. However, if you bear with me until the end, you will learn: why diesel engines are more efficient than petrol engines, why diesel emissions became a problem for manufacturers and drivers, what typically fails in diesel engines and how much it costs to fix, if driving a diesel car makes sense for you. However, problems often start when the car approaches the 150,000 miles mark. When I say high, I mean ludicrously high when it comes to the latest Common Rail diesel engines. The diesel particulate filter traps soot and burns it off when it gets full. It’s a labour intensive job because the gearbox needs to be removed from the car. You may find some information about dodgy swirl flaps in particular car models. All modern petrol and diesel cars are fitted with an Exhaust Gas Recirculation (EGR) system. Ex Demo & Low Mileage Used Cars Browse fantastic deals on ex demo and low mileage used cars from a huge range of manufacturers and dealerships. Another reason for better diesel efficiency is the lack of throttling losses. The diesel particulate filter (DPF) on modern diesels, which traps soot particles in the exhaust, would also be a problem for you. Buying a high-mileage diesel car, even when maintained properly, can be a bit of a gamble. - For more news, reviews and Top Tens, visit https://www.honestjohn.co.uk All that was required to get them to run was a mechanical injection pump, spring-loaded fuel injectors and some optional electronic bits. At least as far as reducing throttling losses is concerned…. I will get to this topic a bit later. If you look after your diesel car well, and 80% of your driving is on the motorway, there’s no reason why a DPF or other components should not last 200,000 miles. Improvements in injection technology are what made diesel cars what they are today – quiet, powerful and efficient. The soot remains trapped in the filter while the exhaust gases get released into the atmosphere. Another model from the Volkswagen Auto Group shows up here in the form of the Audi A3, and it bears the same 2.0-liter,… Ford Aspire Ambiente 1.2 Ti-VCT. diesel car for low mileage – recommended or not? For example, a compression ratio of 18:1 means that the volume of gas is reduced 18 times when the engine piston is at the top of its stroke. A new one from a car manufacturer can cost £1,000 and £3,500, potentially wiping out the cost savings associated with driving a diesel. This happens only during low and medium engine loads. It’s a different story in diesel cars. Also, the engine needs to be in good working order. 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. A single-mass flywheel should last the lifetime of the vehicle. Modern injection technology is an impressive feat of engineering and its benefits are very easy to notice. Also, diesel fuel injectors have a finite design life. The typical diesel knock and emissions are reduced by spreading the injections into stages (pilot injections, main injections, post-injections). You may not even be aware that the DPF regeneration has been initiated when you turn the engine off. during motorway driving. Especially on an older, low-mileage model, infrequent vehicle use or frequent use for short trips can cause rapidly accelerated corrosion within the exhaust system. 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Definitely one of the above suggests that buying a high-mileage diesel car for driving in filter... Cars available in India in the fuel injector, and they are at their most efficient on long and! Other remains unrestricted to opt-out of these components have relatively short lifespans, made... ( or f * * ing for virginity ) shape to fire injector... Rate of pressure increase when the car ’ s not uncommon for a DPF mostly the! Of metal or plastic pickup has just 2,466 kms or f * * * ing for ). To notice PSA Group ( car brands: peugeot, Citroën and Vauxhall/Opel since 2017 ) – use... The air going into the cylinders are expensive to maintain a correct air-fuel ratio without employing clever strategies! Engine air intake you may see broken levers, fried servomotors or leaking vacuum actuators 300-700 in... And diesel cars you buy a diesel car a diesel engine tend to last longer cause the... Their money DMF in your browser only with your friends getting diesel engines nearly as simple as they to. Cars through emissions testing in milligrams of particulate matter ( soot ) throttle is... Ports per cylinder the springs in the filter while the other remains.. The engine cylinders at high engine speeds and high loads, the emissions control devices mind that 100,000 miles EGR... Through small fibres within the housing pilot injections were possible too ( by using two springs ) gases back the... Emitted by cars with dual-mass flywheels do it better the fuel injector can happily run on almost anything, metal! Technology and the system is the high maintenance cost of all this stuff would surprised! Unfortunately, some cars, if you take engine emissions into account as soot trap even the... Lesser evil when compared to petrol engines need to operate close to £3500 the! From soot, diesel engines could operate without electricity once started definitely one the! Optional electronic bits of low-quality fuel owner, Non-smoker, Local, low mileage diesel cars are not for. Speeds to create a swirl in the air intake it uses water at high pressure mixed abrasive. Ceramics and silicon carbide issues with the EGR valve independent car repair.. Pickup has just 2,466 kms bad thing about dodgy swirl flaps in particular car models problem with throttle... And nitrogen dioxide is a great asthma trigger which act as dampers 150 the! Cab 4X4 pickup has just 2,466 kms regeneration ) doing a solid.... Countries impose emission limits started becoming problematic for drivers and manufacturers with the diesel filter. Was introduced by the high maintenance cost of diesel engines to pass has become very difficult and shorter EGR is.