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The advantage of the FAP is that it handles city driving better than a typical DPF because it can regenerate at lower temperatures. The rest of the improvement in diesel fuel economy mainly comes from the fact that a litre of diesel fuel stores 12% more energy than a litre of petrol. 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. Free Member. As a final word, the lifespans of the problematic parts I mentioned in this article are very rough estimates. The car still has the original dual-mass flywheel, injectors and even the EGR valve managed to survive this long. In the past, diesel engines could operate without electricity once started. Comment document.getElementById("comment").setAttribute( "id", "ae734a73ba4cb966e237459e1134642a" );document.getElementById("hbef678ffc").setAttribute( "id", "comment" ); Necessary cookies are absolutely essential for the website to function properly. Given: BMW F10, 3.0 diesel engine. Cars fitted with diesel particulate filters burn more fuel than cars without. Improvements in injection technology are what made diesel cars what they are today – quiet, powerful and efficient. They are the source of particulate matter (soot) that diesel engines are infamous for. An EGR valve that doesn’t fully close will reduce power and increase fuel consumption. The injection technology used today is called Common Rail from the “common” high-pressure fuel rail that feeds the injectors. The extra CO2 emitted by cars with particulate filters is the lesser evil when compared to the particulate matter that gets burned away. electrics all working electric windows and mirrors. Everything is governed by computers more powerful than what was necessary to put people on the moon. Feeding a solvent into the combustion chamber works against the oil film that prevents pistons and cylinders from wearing. See 29,076 results for Diesel cars with low mileage for sale at the best prices, with the cheapest car starting from £123. Summary All of the above suggests that buying a diesel car for mainly city driving is not a great idea. Also, diesel fuel injectors have a finite design life. Low mileage cars do rust. (function(d, s, id) { Find Mercedes at the best price. A butterfly valve called the throttle plate is used to control the amount of air entering the engine. Active regeneration usually takes 5-15 minutes of continuous driving, ideally at a constant speed. Explore Diesel cars for sale as well! The price depends on the location of the valve – some are quite difficult to get to. Also, the amount of exhaust fumes that gets recirculated is a lot smaller. Dual-mass flywheels make cars smoother and quieter. bodywork all good and clean, I've spotted one small blemish near the filler cap. At partial loads (partially depressed gas pedal), the throttle plate is only half open to reduce the amount of air entering the engine. It's diamond black crystal pearl in colour . Essentially, petrol engines are constrained by the air-fuel ratio without employing clever injection strategies in direct-injection engines. To add insult to injury, a problem with the EGR may cause issues with the diesel particulate filter. Because of the dirty nature of combustion engines, most countries impose emission limits that the car manufacturers need to meet. The compression ratio indicates how much the gas inside the engine cylinders gets compressed. Affects: petrol and diesels - but more diesel cars will be affected (Euro 6 is the minimum standard for diesels; Euro 4 for petrol) 2023. It’s just that dual-mass flywheels do it better. 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. Its disadvantage is the need for additive refills every 80,000 miles or so, and the system is even more complex. Food for thought – let me know what you think in the comments section! These can provide equal low-end grunt power with a … At some point, it will be so clogged that it will put the car into “Limp Home” mode and illuminate the “Check Engine” light. 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. If you’re unlucky, or you didn’t do your research prior to buying the car, you may be looking at an additional £500 to deal with the swirl flaps. It is called active regeneration. Ford Aspire. 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. A dual-mass flywheel failure is definitely one of my favourite first-world problems. Also, the engine needs to be in good working order. Everything was purely mechanical and such engines were still used in passenger cars in the 1990s. That can happen only when the car is driven for half an hour or so at 50mph or more. Low mileage diesel drivers may be wasting their money. That’s why some modern diesel cars are not much louder than petrol cars. In some cars, it is possible to convert from a dual-mass flywheel to a solid flywheel. Just like with the DPF, short journeys mean more carbon build-up and shorter EGR valve lifespan. Here's everything you need to know if you own a diesel or are thinking of buying one The need for regular regeneration cycles is precisely why particulate filters are a terrible idea in cars that are driven in cities. If you are doubtful, get expert advice. Whether you continue driving short distances with an orange light is a judgement call. Find: Ford Focus at the best prices. As is often the case, this comes at a price because engineering design at this level of technological maturity is almost always a compromise. When the DPF is full it goes through a cleaning phase known as "Regeneration". Are there any small changes to my driving, like doing a 50-mile trip each weekend, that would make this work for me? On a positive note, diesel engines are pretty good when it comes to carbon dioxide (CO2) emissions. Other factors that are bad for the DMF is urban driving, jerky gear changes and aggressive takeoffs from a standstill. However, not knowing the car’s history increases the risk substantially. This is the worst-case scenario. If you drive primarily in the city without regular longer trips, the DPF lifespan can be halved. The 14.7:1 ratio of air to fuel is the stoichiometric ratio. diesel car for low mileage – recommended or not? The particulate matter needs to be burned off before the DPF becomes full. There is also the option of injector reconditioning for about half the price of a new set. The flaps are operated by an actuator (vacuum actuator or electric motor). My back-of-a-cigarette-packet calculations tell me that you should be doing at least 12,000 miles every year for the fuel savings to offset the potential cost of maintenance. 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). The purpose of the dual-mass flywheel is to reduce noise and vibrations in the cabin. For used vehicles, example monthly payments are based on : 48 month term, 15% deposit and 10,000 miles/year. Okay, enough about the boring emission standards. Diesel cars are being demonised, but are they really as bad as they're being made to seem? I know it’s expensive and seems like an overkill, but if you run out of luck, a swallowed swirl flap can damage the engine so badly that it wouldn’t make financial sense to repair it. 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. In others, you may get 150,000 miles out of the EGR valve (but probably not much more than that). That means the opposite is also true. Swirl flap removal kits are inexpensive and widely available. I’m sure you can already guess what happens to moving parts that are subjected to diesel exhaust fumes. The problem with city driving is that you will almost never drive for 15 minutes without stopping and waiting at some traffic lights, which may interrupt the DPF regen (it depends on the car and the length/frequency of the stops). 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. Short trips or start-stop driving does not allow the exhaust temperature to get high enough to initiate passive regeneration. The whole point of swirl flaps is to reduce emissions. RTÉ is not responsible for the content of external internet sites. What does the DPF warning light mean? hello stw.. please share your knowledge with me as i have many differing opinions from my colleauges.. There is generally less wear and tear with low mileage cars, as long as the car has been cared for properly. The vehicle's computer determines when to regenerate the DPF based on the amount of soot/particulate matter in the filter. The first-generation directly injected diesel engines were quite good too, albeit a lot more complex and more expensive to maintain. I find it funny that the DMF makes it possible to drive at such low revs comfortably, but it’s exactly what makes it wear out quicker. These emission standards became so stringent that getting diesel engines to pass has become very difficult and requires many engineering workarounds. One could say that modern diesel engines are crippled by the emissions control devices. The mechanism that adjusts the swirl flaps may fail. 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. Low-mileage, young used cars are usually a bad deal because they haven’t depreciated enough. 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. You don’t get the benefit of reducing throttling losses, and the EGR valve leads a much more difficult and shorter life. Changing the DPF isn’t difficult or time-consuming, just the particulate filter itself can be quite expensive. 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). Mileage is considered high or low relative to the car's age. You may find some information about dodgy swirl flaps in particular car models. Replacing the EGR valve costs somewhere between £300 and £600 at an independent repair shop. The dual-mass flywheel is a torsional damper fitted between the engine and the clutch. The DPF itself is fairly reliable. Pretty much all modern diesel cars are turbocharged, so don’t let a low compression ratio (16:1) deceive you – their effective compression ratio can be pretty high. Diesel engines have higher compression ratios as compared to petrol engines because it is necessary to initiate combustion. Required fields are marked *. Drivers should check their owners' manual to identify the appropriate light on the dashboard. Therefore, car manufacturers implemented a solution to force the exhaust temperature to rise to around 600ºC and clear out the DPF. 24 kmpl. Because diesel engines burn less fuel, they also emit less carbon dioxide than petrol engines. Apart from reducing emissions in petrol cars, the EGR reduces throttling losses, which improves efficiency. Cars with diesel particulate filters require low ash engine oil and regular regeneration cycles. The first major change that Euro emission standards introduced was mandating the use of catalytic converters in petrol cars since 1993. 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. 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. The price above is what independent car repair shop will charge you. As a car owner, it used to be the norm to schedule in an oil change every 3,000 miles. This raises the temperature in the DPF to circa 650c and burns the trapped soot/particulate matter to ash. They may develop air leaks around the shaft that holds them (some designs only). A single-mass flywheel should last the lifetime of the vehicle. The compression ratio is directly linked to engine efficiency. Some of these components have relatively short lifespans, which is the source of the high maintenance cost of diesel engines. If the DPF warning light does not go out or is accompanied by an Engine Management Light, bring the vehicle to your nearest main dealer immediately. That can't be done these days, however. High mileage diesel cars are nearly as expensive to maintain as the Space Shuttle. Buying a car with an inordinately low mileage. It is mandatory to procure user consent prior to running these cookies on your website. We also use third-party cookies that help us analyze and understand how you use this website. Euro 6 (new cars registered from 1 September 2015) – even tighter NOx emission limits meant that cars started needing additional NOx treatment. Solid flywheels are inexpensive and don’t really wear out when not abused. Have you heard of waterjet cutting? Burning off the soot is called regeneration. These cookies will be stored in your browser only with your consent. The main problem that can arise in these circumstances is usually with the diesel particulate filter (DPF). 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. The typical lifespan of a DMF in a diesel car is between 100,000 and 150,000 miles. 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. Improvements in fuel injection technology are what made modern diesel cars less diesely (for a lack of a better word). Problems with the EGR valve, injectors or driving with a faulty thermostat will reduce the DPF lifespan. If this sounds great, wait until you get the bill for replacing the DMF in your car. Keep in mind that this option is illegal because it increases emissions. 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. js.src = 'https://stillrunningstrong.com/wp-content/cache/busting/facebook-tracking/fbsdk-en_GB.js#xfbml=1&version=v3.2'; However, such improvement is bound to come at a cost at this level of technological maturity. Well atomized fuel mixes better with the air. There is one more advantage that diesel engines have that’s still valid today – it’s their longer lifespan. We have 163 cars for sale listed as: ford focus diesel low mileage, from £1,395 The improvements in fuel injection technology and the use of dual-mass flywheels managed to turn a frog into a prince. The higher the injection pressure, the higher the abrasive action of fuel being forced through 0.1 mm holes (orifices). On the other hand, some cars run perfectly fine with solid flywheels with a minimal difference in the level of noise and vibrations. Have a look in the car directory on this site. As you can see, it’s very important to know what to expect maintenance-wise when you buy a used diesel car. It’s time to get to the point of this article. Swirl flaps live in the air intake manifold. Incorrect tire pressure is a common cause of bad gas mileage. This variant of the DPF is used by the French PSA Group (car brands: Peugeot, Citroën and Vauxhall/Opel since 2017). Depending on the manufacturer, you may see broken levers, fried servomotors or leaking vacuum actuators. All modern petrol and diesel cars are fitted with an Exhaust Gas Recirculation (EGR) system. Buying a high-mileage diesel car, even when maintained properly, can be a bit of a gamble. It sits inside the throttle body attached to engine air intake. I will get to this topic a bit later. Then there is the NOx removal system. These filters need to be unclogged … Modern diesel engines still operate on the same principle as 40 years ago. 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. 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. A forced regeneration is initiated through a diagnostic tool when the car is parked. Replacing a DPF can cost over 1,500 Euros for the part, before labour costs are added. Problems with the EGR valve, injectors or driving with a faulty thermostat will reduce the DPF lifespan. Burning off the particulate matter creates extra CO2 and some ash. For passive regeneration to take place, the temperature in the DPF needs to reach approximately 300°C, which is only possible during relatively fast driving.

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