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Matt
Matt, Mechanical Engineer
Category: Audi
Satisfied Customers: 218
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have an Audi a3 2.0 tdi 2004 automatic which is rough at

Customer Question

I have an Audi a3 2.0 tdi 2004 automatic which is rough at idle when warm, almost like a misfire. What I checked until now is: Timing torsion value is at 0.5 , fuel consumption starts at 0.6l/h the drops down to 0 to 0.2l/h, injections values are are around 0 with injector number four being a bit worse than the rest but still around +-1. I took out the camshaft cover and bent the connectors to make sure I have a good connection to the injectors. Another thing I found by luck is that if restrict the airflow to the engine the engine idles fine. Another thing I checked is the fuel filter which I replaced and no, I didn't have any oil in the filter housing and I don't have any signs of diesel in the oil. no lose of cooling liquid. Yet another thing is that I think for some reason the turbo kicks in at idle as at soon as the rough idle starts I can hear a sound which is similar to the sound of the cooling fan working but that one is off. Everything I have at this point is saying that for some reason the ECU thinks the engine needs less fuel and less power, is like he thinks am decelerating.

And final no error codes except glow plugs error.

Please help!! :))

Submitted: 2 years ago.
Category: Audi
Expert:  Shantal-Mod replied 2 years ago.
Hello,
I'm Shantal and I'm a moderator for this topic.
I've been working hard to find a Professional to assist you with your question, but sometimes finding the right Professional can take a little longer than expected.
I was checking to see if you had already found your answer or if you still need assistance from one of the Professionals.
Please let me know if you wish to continue waiting or if you would like for us to close your question?
Thank you,
Shantal
Customer: replied 2 years ago.

Hello,

If it would be possible to cancel the question as it's not needed any more.

Not long after I posted the question the seals on injector number 1 gave up and I had to replace them so I replaced all of them on all 4 injectors and checked all the pipe connections and now it seems to be fine.

I have 3 theories to what the fault might have been, 1st leaky injector seals, 2nd vacuum leak and 3rd possibly some blockage in the common rail which cleared when the seals on the 1st injector failed.

Who knows I'm glad that it works, don't really know why but it works