I was driving home yesterday and in traffic. So when the traffic cleared and I was able to go faster I felt like the engine was running on 3 and not 4 cylinders. It felt sluggish and when I would start to gain speed the car would start to shudder and I can feel the steering wheel shaking. I would let go of the gas and it would go away. I don’t get a CEL so I'm not really sure what could be the issue. I can still hear the turbo kick in and spool up. .... Maybe a leak???.... Also since I don’t have a warranty how much dose it cost for the dealer to diagnose the issue or is it best to take it not to a dealer but an Audi mechanic.

 

Not sure what could be wrong, but i took my A4 to the dealer to diagnose an odd sound. They only charged $70.00 and found a few other things I hadn't caught yet. I felt it was money well spent.

 

codes will be stored even if the CEL wasn't on so have it scanned, how is the car running now??

 

It's still running wierd umm i was looking under the hood and i noticed this. People have talked about this thing here was not able to find the post again but its located by the turbo by the air box. Lookes melted and has a hole on the top0 of it. Here is a picture of it. Can this be somehting that could be giving me issues.?

 

that's a one way valve and most likely the problem ( replace it )

 

also check if there is a heat shield for that part

 

so I should be able to get this anyplace and not just the dealer? And do you know what the hell that thing is and what it dose?

 

just get it at the dealer its bout $20, also check for vacum leaks, i've had some cause the same symptoms u describe, if that doesnt do it, check ur plugs & coilpacks, could also be other stuff, but those two are common failures
ps its a one way vacum valve, check the arrow, you have to install it in the same direction, alos one side is lighter colored,

 

yeah i will replace that on my lunch break today and then if that dont fix it I will look for leaks after work when i can take ti to the garage and take a look it it with mroe time.

 

ohhh and BTW thanx people