I was driving home from the gym, all of sudden my 04' 1.8T started to jerk off, and lose power. Good thing my place was a block away. The very next day I purchased an OBD2 reader and diagnosed the problem. My 4th cylinder coil blew, so I purchased a new one and fixed it.

Flip this, the very next day (Xmas EVE) I was driving on the Highway, the same problem occurred, really dangerous!!! I initially thought I didn't install the coil securely, but according to the obd2, now the 1st cyl coil blew. Yes.. WTF... Now I fixed the probem, but my car has lost some of its performance, and idles pretty rough.

ANY feedbacks on what I can do to bring my car back up to par?!?!!?

 

Change all coils! That is a rule with Audi always change them all at the same time. when one goes they will all probably go very soon

 

Perhaps check for idle misfires with VAG. Occasional cold misfires are not a concern but hot misfires need resolution.

I've seen coils last 4 to 1 lifetime on the same engine. I've also noticed signs of water penetration on the coil moisture seal and body / spark plug tube / corrosion on coil jacket, etc of failed coils, yet on the same engine other functional coils are clean and visually appear as new. Always clean coil base and tubes before re-installing. I use a tiny bit of lithium grease on moisture seals to help keep moisture out of plug tube and ease install / future removal. Cleanliness and preventing moisture damage help ensure long coil life.

 

been having what I believe to be intermittent coil problems as well. Mainly seems to happen on snowy days and the odd time in rain. Seems most definitely moisture related. Driving down the road I will get momentary loss of power. Just a quick jerk and then everything is normal. Its like the engine skips a beat. Never happens at idle and doesn't do it under any specific driving style. Just when its snowing/roads are covered with powdery snow. Been doing it for about a year now, but never thrown an engine code.

 

im going to change my coils in my 02 a4 quattro i was wondering if there was a specific brand or can i just get one from my local canadian tire or part source. vs the audi or VW ones

 

So how do you know if one of your coils has crapped out?

I did have a sudden jerk the other day, but it lasted like half a second and I haven't anything else happen? Can't tell if it's a rough idle because it always idles rough.

One thing I noticed is when I turn on the car, the rpm stays at 1000 rpm..it usually starts alot higher than goes down. This is the winter season. It's a 2007 B7

 

If you feel any little loss of power or sudden jerks in the shifts or rev. The cars pretty much due for coil replacement. It is a well known problem for Audi mechanics. The only recall Audi put out for this problem was back in 02'. But to be safe, I'd say change your coils every 80,000 km. I keep a couple extra coils in the trunk now just in case. It would be really bad if your going on a long trip and this occurs. Audi should make a compartment for coils beside spare tires!!!!