Injector failure and DPF question

[leoni]

Iv'e recently bought an A4 2.0tdi 170 and after reading various posts on this forum am now fully expecting Injector and DPF problems, so I have a few questions if anyone can enlighten me.

1- Are the injectors prone to failure at random, or around a particular mileage? (mines done around 80k odd and is ex fleet, wondering if the problem is likely to have already occured and been sorted out.

2- Is the pour into the fuel tank injector treatment likely to help things (I'm guessing it can't do any harm.)

3- Am I right in thinking that despite the DPF successfully regenerating it will still eventually become blocked by a build up of soot from the burnt diesel matter, and at this stage can it be sorted by any means or is it replacement or removal only?

Thanks

[Issac Hunt]

1. Seems to be fairly random

2. Probably wont make any difference, doubt it will do any harm though.

3. If the DPF is doing its 're-gen' OK then it's not filling up, and shouldn't cause you any issues

[gaz1965]

Injector failure… totally random and without warning whatsoever.
Enjoy every drive with the anticipation of a break down

[leoni]

Well that's a relief, thought it might be something serious!

Glad I bought a reliable Audi now.

Never had any of this worry with my good old 1.9.

Guess i better start driving around in the mrs's city rover so i've got less chance of breaking down.

[mini-mad-matt]

Haha. I bought the wife a 53 reg Polo 1.4 tdi this week to run about in with the kids so she doesn't have to use the unreliable piece of junk in my Sig. ;-) I'm serious about that by the way! It also gets about 55 mpg around town so all's good!

[keemaklan]

1) Injector failure is random...however when one goes, they all seem to slowly go.

2) Pouring injector cleaner such as Redex or Millers is good to use periodically, but won't prevent or prolong failure of the injectors.

3) Your quite right. When regen occurs, it burns all the NOx particles off the walls of the filter (its a full wall through filter meaning the pipe is blocked on the exit end and the exhaust gases go through the wall to escape) The burning of NOx particles leaves soot residue. This is why, regardless of how many miles you do in a dpf fitted car, it will eventually clog up one day!

Your options are either remove and replace with a new one.

or the better option of; removing, remapping and removing the dpf map off the ecu and have a power, fast diesel with no DPF! more power, more economy!