A4 Avant B7 170 BRD Not Starting

[John Redd]

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 🙏

 

[John Redd]

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.

[John Redd]

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.

 

[cliffcoggin]

11 minutes ago, John Redd said:

 Obviously the belt timing is ok.

Not necessarily. The new belt may have jumped a tooth if the tension was wrong. Did you renew the tensioner at the same time as the belt?

If the timing proves to be correct it is going to be difficult to diagnose the fault without a lot more information and testing. In your position I would get it professionally diagnosed to check against your own diagnostic tester.

[John Redd]

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!!

[Stevey Y]

33 minutes ago, John Redd said:

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!!

Hi did you code in the new injector, if not it throws the whole thing out, the reason behind coding is it restores the balance to the engine in so much as it informs the ECU of the new injector and the ECU adjusts the parameters to suit the new unit, dont believe everything you hear from specialists, I have always worked on the theory that if an item is made by a man another man can take it apart and put in repair parts to make it function again, we had all this with early Bosch piezo injectors, can't be refurbished, a year later United Diesels were advertising refurbed units.

Steve. 

[John Redd]

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??