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Hi, after some advice on whether a fiesta diesel is any good.

My wife has a Mazda 2 diesel which we need to get rid of and are looking at a fiesta as a replacement, something from 2015-2016. We get around 65mpg from it currently on a mix of distances.

I've got an ecoboost fiesta so know the car well, just know nothing about the diesel engines. So my questions are:

Are the diesels any good?

What known issues are there?

Is it worth getting a diesel or should we go for petrol?

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Ecoboost then. Don't bother with a diesel.

Can I ask why a diesel isn’t advisable with an annual mileage of 10k? I had a turbo diesel and averaged out about 12.5k per year (also lots of short stop start journeys) had it for three years with no problems with it al all

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5 minutes ago, Fiesta1.25 said:


Can I ask why a diesel isn’t advisable with an annual mileage of 10k? I had a turbo diesel and averaged out about 12.5k per year (also lots of short stop start journeys) had it for three years with no problems with it al all

What age was it?

It's not so much the mileage as the journeys.

All the modern ones have DPFs. 15-20 miles per journey isn't really enough for the DPF to keep itself clean.

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Ah ok that clears that up for me, as it was a 2006 which didn’t have a dpf, so didn’t have to worry about keeping it clean.
Cheers

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Typically how often does a diesel have to do a dpf regeneration and what is required for it?

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It depends on the temperature, the way you drive, the type of roads you drive on. Engine speed, engine load.

Lots of different factors. But it probably needs about 10-20 mins to do it's thing with a hot engine and exhaust. (i.e. engine must be fully up to temp before it even starts).

If it can't do a regen it will keep trying until eventually the pressure sensors trigger a fault code and warning light.

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Doing short journeys will just clog up the DPF. Was curious like fiesta1.25 to why that sort of mileage isn't good for diesels. My uncle got his DPF removed and remapped out of his merc so this could be done if you got a newer diesel. With my car I'm planning on fully / partially blocking the Egr valve to reduce the soot build up. 

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2 hours ago, zain611 said:

Doing short journeys will just clog up the DPF. Was curious like fiesta1.25 to why that sort of mileage isn't good for diesels. My uncle got his DPF removed and remapped out of his merc so this could be done if you got a newer diesel. With my car I'm planning on fully / partially blocking the Egr valve to reduce the soot build up. 

i would not have said that if i was you. naughty naughty.

you dont partially block it. you stainless steel plate it fully

 

Jamie

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Lol sorry Jamie, the reason I said partially is because I don't know if the car will through up a engine management light if I fully block it. I've seen some plates for my 1.6 tdci, ones which have a small hole and others with no holes. If I blank it fully and the engine management light comes on I may have to put a blanking plate with a small hole. My dad is thinking of removing the pins on the electric motors which operates the flaps in the Egr so it would think it's opened the flaps but it's still closed. Have to see if it works. 

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If you have it fully blocked off you can have the ecu recalibrated by a tuning specialist so that no eml comes up.

I was thinking of having it done but how much benefit would i really get and would i get my money back in fuel savings.

 

Jamie

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The main reason I'm thinking of blanking it out is to reduce all that soot from accumulating in the engine. Yes you will increase the amount of harmful gases from leaving the car but you won't lose power. 

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Just unplug it so it's stays shut an eml light is only advisory anyway on mot or just wipe the code that all I've done and car is fine 

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20 hours ago, zetec Adam said:

Just unplug it so it's stays shut an eml light is only advisory anyway on mot or just wipe the code that all I've done and car is fine 

When you said wipe the code did just remove the code with a diagnostic unit or did you take the car to a tuning company to remove it. Having said that a few months ago the engine management light came on saying something about the Egr. Back then I was just driving the car from the driveway into the garage at low speeds until my insurance ran out for my previous car (which then I could drive the current car on the road). I deleted the error code and since then nothing has come up. 

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