2.5tdi occasional misfire

[blancy]

Hi folks.

 

Had this car for 6 months and it has a sporadic misfire.  No obvious interval but let's say every hundred miles to give an idea.  Happens at lowish revs (1.2-1.5k) usually on a mild incline (so moderate acceleration) and has happened in 4th, 5th and 6th gears.  I generally try to avoid the circumstances under which it might occur (so often keep revs above 1.5K on mild inclines) or it may happen a bit more regularly.  When it happens it feels like it misses a beat - quite a violent single stutter.  Possibly occurring slightly more often as the last 6 months has progressed.

I'm new to Audis and new to diesels.  Any obvious contenders for the possible cause?

 

thanks

John

[Trevor]

Hi John...welcome to the Forum

I would imagine that it would log a fault code in the ECU if there is some sort of misfire so may be worth getting it scanned for fault codes and go from there.

let us know how you get on with this one.

Cheers  Trevor

[noetus]

My 2.5 TDI car occasionally misfires at idle, especially when cold and just started up, with no report codes.

[And301j]

My 2.5 does the same on first start up plus is smoking on start up any ideas guys? 

[Trevor]

Hi Andrew...welcome to the Forum

Smoking on startup could be many things including worn valve seals, blocked EGR, worn piston rings/bores, turbo....etc.

Always best to run tests with diagnostic equipment to accurately determine the cause

Cheers  Trevor