Injector Failures - Possible recall

[jimgironde]

Car is in the Dealership today for the 4 injectors/wiring loom. Am also having the cambelt and water pump replaced as the car has just turned 4 years old.

There are quite a few comments on this thread about the car feeling smoother in its power delivery and other comments about 10% plus better fuel consumption.

I read an interesting article a couple of years ago about the running in of modern diesel engines. It stated that whilst engines are good straight out of the box, efficiency will increase after 20k or so as the engine loosens up.
It also stated that unless premium fuels were used all the time, the injectors would become less efficient as they would start accumulating dirt etc.,
So you have general increased efficiency from the engine that is potentially cancelled out by reduced efficiency from the injectors!!
This explains why people assume engines are bench run in and cannot increase in efficiency.

So when people are saying the car feels more responsive, it is not neccassarily better injectors but cleaner ones.
Of course the cleaner injectors will give you better fuel consumption.

I will be very interested to see what happens with my car. 12 months ago, when the car was just out of warranty, I started using Millers fuel additive. I have used Millers on every fill up for the last 12 months and I have seen a consistent improvement on economy of between 7 to 10%, this is because my injectors are always clean.
If what I have read is correct I will not see any improved efficiency but it would be a bonus if there were!!

[daveo138]

There are quite a few comments on this thread about the car feeling smoother in its power delivery and other comments about 10% plus better fuel consumption.

Although my car felt more responsive following replacement of injectors, the trip computer was also telling me that I was getting +7MPG more than before.
This has now been exposed as an inaccuracy of the trip computer. It was originally underestimating consumption by 5MPG. It is now overestimating by 2MPG. Fuel consumption is exactly the same. VW have obviously 'tweaked' it.

[Stuart W2]

It was originally underestimating consumption by 5MPG. It is now overestimating by 2MPG. Fuel consumption is exactly the same. VW have obviously 'tweaked' it.

In the early days when I always filled to brim and calculated my mpg every thousand miles or so the computer was always optimistic by about 2 mpg.

Others who did the same usually said theirs was optimistic by around 1-2 mpg, with larger variations being untypical.

Thus perhaps your computer is just now just reading 'normally', but whether or not the change has anything to do with the injector replacement is maybe another issue

[daveo138]

Thus perhaps your computer is just now just reading 'normally', but whether or not the change has anything to do with the injector replacement is maybe another issue

As I calculate MPG every time I fill up, I know that the sudden perceived improvement coincides with the visit to VW dealer. Also, the computer now tells me that I have a range of around 700 miles, whereas it was usually around 560 before, and the 'refuel' warning comes with 60 miles remaining rather than 50.

[bombanela]

daveo138

Thank you for your mail, open and could see perfectly.

thanks

[bombanela]

By the way anyone have any proof of this intervention, such as bills, invoices, etc..

Thank you guys