John Redd

Hi I have a similar problem with my A4 Avant 2008 BRD PD engine. What happened to make it start running again? Regards John

Already changed with plugs as well, still the same!

HI Steve I did a compression test myself and tried to do it when the engine was warm and i got 170psi on 1,3 &4 cyliders and about 150psi on cyl2. I would have expected a lot lower reading if the fault was carbon build up but i'm not that familiar with these engines so perhaps someone would have a better idea than me?

Hi Steve Good point! i was advised that these injectors didn't need coding but perhaps you are right. Although it doesn't explain why it still wouldn't run when i refitted the original injector?? Unless you know different??

Hi There I have various Audi's with different problems and this one is a frustrating as the others. I bought the car recently with a known misfire on cylinder 2 so i replaced the coil packs and spark plugs as it was due a full service anyway and it seemed to be an electrical misfire. This has not cured the problem. The engine will initially start ok from cold and run fine but then starts to run lumpy and throw a fault code which shows as "cylinder 2 misfire" on a code reader. I then suspected a faulty injector which i have replaced with a new Bosch unit but it's still running exactly the same. I've done a compression test which seems to show all is fine although cylinder 2 was slightly lower than the others but not drastically. I then suspected carbon build up but when i changed the injector i inspected the intake valves and although they did have some carbon deposits it was quite even across all four cylinders and didn't seem that bad. I would have thought that if this was the problem then it would be evident from start up. Cylinder 2 spark plug does seem to show more sooty deposits than the others but not excessively. I'm assuming that cylinder 2 is the 2nd cylinder from the front of the car? If not then perhaps one of the other injectors is at fault 🤔

Hi There Thanks for your reply. Yes i replaced the belt and all the pulleys & tensioner. I did re-check the belt timing and it was spot on & It seems to run ok with easy start so i'm sure it's not the belt. I think you may be right about getting it professionally diagnosed as i've run out of ideas as to what it could be. Everyone i know is telling me to cut my losses and scrap it but although the car is old with quite high mileage i really don't want to do that as it's not in bad condition and i'm also keen to know what's actually wrong with it. I've been told by a diesel injection specialist in Colchester that these engines are unique in that the injectors can't be refurbished but are pretty much indestructible so i'm hoping that someone else out there must have had the same issues that i'm having!!

There is fuel pressure at the fuel filter but i don't know how to check whether there is fuel pressure to the engine as the fuel rail is inside the cylinder head on this engine.

An update to this post, the engine eventually started briefly with the help of some brake cleaner sprayed into the inlet manifold and it ran on 3 cylinders with the new injector for a short while but then spluttered and died and now won't start again! Obviously the belt timing is ok.

Hello everyone. I am hoping that someone can help with my problem? I have an Audi A4 Avant 2008 2.0 Tdi BRD engine that will not start and i am struggling to find out what is wrong with it! Initially it had a faulty injector issue that would drop a cylinder under load. I managed to source a reconditioned injector which i fitted but the engine would not start after fitting it. I then replaced the original injector but the car still won't start. I have a code reader which is showing no fault codes at all so i am at my wits end trying to find out what is wrong I have fitted a new cam belt and the car was running after fitting this so i know this is not the issue e I did try some easy start but al it did was backfire Please help 🙏