I am really hoping that someone can help on this forum. I have a 2002 Audi A4 TDi 130BHP. I have found an old thread on this site where some one describes the same, frusutrating problem. Audi cannot fault the car - well so their diagnostics tell them and so far I have had the following done to my car but while transmission has improved somewhat the fault is still there, EGR value cleaned, new MAF fitted, thermostat fitted, N75 valve fitted, crank shaft seal fitted. I only ever get this problem when it rains so I assume that it is damp related.
1.When under load i.e 2nd/3rd gear using torque to pull away it hesitates... in that the turbo is not present for about 2-5 seconds and can spool up. Essentially there is no acceleration for about 2-5 seconds until the boost kicks in. Once at speed it is fine but as soon as you change gear you have to wait for the acceleration again.
2. When you turn the engine off the car shakes. This is as if the timing is out, like the engine cylinders are not stopping in correct time.
3. It only ever does this in the rain, the rest of the time it drives like a dream but in the rain it is dangerous to drive, I have to sit at roundabouts waiting for a gap the size of the M25 as I have to allow for the acceleration delay and not place my two kids in any danger
4. Large amounts of black smoke pour out of the exhaust when it is playing up. Its as if you put your foot to the floor to make sure you get away on a roundabout and it leaves the car behind a thick black smoke.
Can anyone advise on what they think the cause of the problem might be? Electrical or mechanical? No one seems to know what the problem is but I do at least know that I am not the only one with this problem. After 2 years of the problem getting worse, I am desperate for some help! I am not a mechanic unfortunately and my knowledge of engines is limited - sorry