Ok I have a pressing question that is stumping me with my 2006 A4 Avant 2.0. I'm getting a misfire in two separate cylinders, 3 and 4, so the car is running like crap. Mostly it shows up as a misfire in 3, but 4 shows up as well on the diagnostic reader, along with a generic p0300 code. I've swapped the coils and the spark plugs but the problem is staying in those two cylinders, again mostly 3. Do I go through the hassle of taking apart the injectors to see if that's the issue (clog) or do you think it would be something else? Would i get a separate code on a clogged injector? I'm also needing to change a leaking coolant flange if that plays into your ideas.

Thanks.

2006 A4 Avant 2.0
2011 Q5 2.0

 

Could be injectors. You could try swapping your injectors around and see if the problem follows those injectors...that's a method I've done with my truck to test the injectors. I would think the car would throw a CEL but I'm not positive on that.

 

I may be having a simlar issue. Does your issue happen at all RPM ranges? Mine only occurs below 2000 RPM. I also received the 3 and 4 misfire codes. Also, is your car chipped by any chance? I am just trying to narrow down possiblities.

I forgot to ask...Does the temperature of your engine have an effect on the misfire? I know mine does not misfire when the engine is cold. But the hotter it gets, the worse it gets.