4

Why does this happen? It happens when there's too rich of an air/fuel mixture. You usually see it happen during hard acceleration, when the engine is trying to produce more power so it can speed up. What is the process that produces these huge clouds of black smoke? I understand that the huge cloud of black smoke is unburnt fuel, so is this related to worn ...


3

Should I stop the car during that 5 minutes stay at the kindergarten? I leave it running, just to get the oil / coolant temp high. Idling isn't a great way to warm the engine up - since there's no real load on the engine you aren't going to generating much heat. I think in your use case it's better for it then stopping the car and cutting it into two small ...


2

Many diesel cars and trucks have the issue that the turbo "clogs" up with particles when under low load ie coping with city traffic. Once they can accelerate the turbo spins up and cleans itself emitting the black smoke or particles. I had an Audi that was classic for that, if you cruised at just under 2000rpm it was happy but the turbo was not doing ...


2

Based on your total mileage and described usage pattern no a diesel (particularly one with a DPF) would be unsuitable. They are less efficient on shorter runs and in stop-start traffic and the DPF needs regular runs at motorway speeds to trigger regeneration cycles. You don't mention what your existing car is but many old-school naturally aspirated 1.6l ...


2

It depends on the nature of the journeys as well as the length. DPFs don't like running cold (they soot up), so if you're only doing short journeys (<10 miles, or lots of stop-start), you need to take them for a good run every couple of weeks - the commonly quoted one is 15-20 minutes at motorway speeds. This allows the DPF to get up to full temperature ...


2

I don't believe they can effectively clean that far down the line. Either take the car on the motorway for 10miles or so, keep the revs and speed up. Or you could remove the DPF which could possibly fail an MOT OR there's a thing called terraclean which is looks like it does something. It's a machine with fluids that connects to the engine but when you see ...


2

It is recommended to also change the oil filter when changing the oil in any car. The diesel filter is also recommended, depending on the quality of fuel you use, it might be ok or clogging up already (especially that filters are not expensive).


2

The software in certain VW models was able to detect when the vehicle was being tested. It looked at inputs from the steering wheel, tire pressure etc. When in non test mode the software allowed the engine to make more power and pollution. It was not just a matter of turning the DEF system off. A simple analogy would be installing a performance tune for ...


2

The symptoms you describe would be consistent with the engine not receiving any boost from the turbocharger. At idle, the turbocharger isn't providing any boost so the car will behave normally, however as you accelerate the turbo should spool up and provide a big boost of additional air which is forced into the engine. It may be something as simple as a ...


1

The problem is the "chip" - I'm 90% certain of it. You described it in a comment as: It is a box next to the motor. The car has a power 140 PS and now it is 170 PS. The overwhelming majority of these "tuning boxes" are little more than a resistor hooked into the IAT sensor to persuade the car's ECU to overfuel. Sure, it gives you a bit more power (...


1

As an longtime owner of a DPF diesel I have the following thoughts about your question: Both DPF and engine don't like cold idling (wear on the engine due to cold oil, acidic combustion byproducts and clogging, especially since a cold diesel engine produces lots of soot and your engine oil starts cleaning only when warm). Since a diesel has a rather ...


1

The real issue is that short trips will not allow a full DPF cycle, and your car will continue to attempt to run a cycle until it is able to complete a cycle. This may result in poorer fuel economy. Idling will usually not help, as the exhaust heat output has to be higher to clean the DPF. If once a week you do some highway driving for 50 miles it will ...


1

Update March 2016 Still no errors regarding the DPF. Had an issue with the engine cutting out at high revs after this which I have also solved. Update 21st Dec '15 I've fitted the blanking plate this weekend and although the error didn't clear immediately it did after a short drive and hasn't come back after a few days of driving. Fingers crossed that ...


1

It has to get HOT. As you seem to know and elude to by asking if sitting and idling at a higher RPM could resolve the issue. If the car is fit can you just drive it in a lower gear at a higher RPM? Not savagly high like a teenager but reasonably high. If you would be in 5th on the freeway can you drive it in 4th? Some DPF's can get seriously clogged up ...


1

In the UK it's common that people have a "DPF Delete" from their engine map which can improve performance at the cost of the vehicle no longer complying with emissions standards. There seems to be no adverse long term effects on the vehicle over those with the DPF in place with the exception that they can consume clutch packs after fewer miles if driven ...


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