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Diesel Engines A forum dedicated to diesel engines fitted to Volvo cars. See the first post in this forum for a list of the diesel engines. |
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DPF problems? hmmmm......Views : 6659 Replies : 35Users Viewing This Thread : |
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Jul 20th, 2010, 11:43 | #11 | |
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The particles in the exhaust gasses are collected in the filter during normal driving. So called "regeneration" is started in order to burn away the particles and empty the filter. This requires the engine to have reached normal operating temperature. Regeneration of the filter takes place automatically at an interval 300-900km depending on driving conditions. Regeneration normally takes between 10 and 20 minutes. During this time fuel consumption may increase Last edited by Bill_56; Jul 20th, 2010 at 11:47. Reason: mistake, six times a week not twice |
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Jul 20th, 2010, 16:58 | #12 |
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it seems to me that this dpf is a silly design. obviously its easier and cheaper to programme the ecu to inject diesel post ignition rather than fit a additional fuel injector to inject diesel into the exhaust manifold/ just before the dpf. i suppose its going to bite em in the bum if all this diesel diluting the oil and washing the bores will lead to premature engine wear/engines feeding themselves untill they die. diesel is excellent as a cleaning product, the motor will be spotless inside when the mechanic rebuild them! i predict they wont be many of these dpf equipped engines running around in 5 years,and if there is i reckon they will be smokey old buses. live and learn.
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Jul 20th, 2010, 20:34 | #13 | |
Grumpy Old Sod
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Jul 20th, 2010, 21:26 | #14 | |
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If you are on a PERFECTLY level road with light traffic, put the car on cruise control, you may also be able to get a stable readout on instantaneous MPG, which will also plummet. That's only really reliable it's a stretch of road with which you are familiar, and can compare the reading with what it normally shows. Be VERY careful not to focus too much on the instantaneous mpg, as it's a long way off your windscreen view and can distract from driving. |
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Jul 24th, 2010, 10:29 | #15 |
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Having done a lot of research recently due to finding out that my S40 1.6D was one of the first Euro IVs with DPF (original order had been for a Euro III).
An (expensive) additive is added to the fuel tank every time you fill up. This reduces the ignition temperature of the soot. When the dpf diiferential pressure sensor detects that there is a soot buildup the ECU intitiates a dpf regeneration. Amongst other things it changes the ignition timing and injects diesel into the exhaust stroke which then burns in the dpf filter turning the soot into ash. Every 37.5k miles the dpf filter needs to be changed (expensive!) as the ash starts to block the ceramic filter. I've had my car nearly 5 years and done 93k miles. In that time I've had periods of long journeys and short commutes. I've never had an issue with the dpf (as I didn't realise I had one!) until I got it serviced by a third party who didn't refill the additive tank (which is why they quoted £60 cheaper!). Eventually the car went into limp home mode. This was fixed by adding some Wynns (with cerium oxide) to the tank and then taking it for a blast on the A1 - the engine hesitated when it regenned (presumably because of the soot build up). As far as I'm concerned, provided you run the car once for at least 20 minutes continuously every tank of fuel you probably won't have a problem |
Jul 30th, 2010, 12:19 | #16 | |
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Below quote is copied from the Ford Service Schedule for the 1.6 Duratorg-TDCi engined Focus Diesel particulate filter Every 75 000 miles - Renew - Duratorq-TDCi with Stage IV Emission only, if applicable (LTS 25 280 1)
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Jul 30th, 2010, 18:29 | #17 | |
Ex 850/V70 Register Keepe
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I use my V70 D5 Gen3 for almost exclusive motorway use. I have had the rising oil level and subsequent sump oil pollution problem. Now I know what I'm looking for a regen can be spotted very easily, and since I have had the software patch loaded from the recall, my MPG has improved by almost 10 per gallon. Bill is right.
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Jul 30th, 2010, 18:46 | #18 | |
Grumpy Old Sod
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Jul 30th, 2010, 18:52 | #19 | |
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If your car was in the lists I posted and you haven't had the recall letter, you could give them a ring to check it's not just got lost... |
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Jul 30th, 2010, 18:57 | #20 |
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Correction, I posted that in the related thread "comparing Volvo diesel engines".
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dpf white smoke diesel |
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