Engine keeps throwing misfire codes and have replaced 3 of 4 coil packs as they burn out. When check engine light comes on, have scanned with VAGCOM to find one cylinder at a time missing due to coil packs and replaced said coil packs. Today, #3 misfire code has appeared, swapped with #4 coil and misfire code went to #4 cylinder. Bad coil. pretty straight forward but WHY does it keep happening? Have also read on some VW/Audi boards that certain models need genuine VW/Audi coil packs (updated circutry or something?) or vacuum leaks or MAF sensor can trigger misfire codes. There is only one original coil pack left but it seems to be holding up.
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Re: 2004 Audi A4 misfire
It is always a good idea to stay with o.e.m parts and yes there is updated parts in the newer coils. and yes the M.A.F will also cause misfire faults but will not make check engine light flash or make car shake and shudder. also check you wire harness going to your coils make sure your ground wires are not cracked. That could be the main culprate. good luck hope this helps
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Yes the CEL should have turned on. Just turn the key to the run position and the light should turn on.If it doesn't, the bulb may be burned out. Also, if the coil failed and was driven for awhile, it may cause the cat converter to fail after awhile of driving. So, please keep that in mind.
P0306 is a misfire on cylinder number 6. The fact that you have oil on those plugs may or may not be causing it. The oil on the plugs is because of a leaking "internal" valve cover gasket. First thing I'd do is change the valve cover gaskets. Audi will murder you if you want them to do it (I've heard of people quoted $700 or more for this job). It's VERY easy to do. You can order the gaskets from www.ecstuning.com or www.purems.com for about $25 per side. I'd change them for sure, as they're a known issue on these cars.
Now, if your new plugs and changing the gaskets (and cleaning up of course) doesn't fix the misfire, you need to swap coil packs around and see where the code goes. The coil packs are the three parallel items on the top front center of the engine under the beauty cover. Trace the #6 wire back to see which coil pack it goes to. Then swap that pack with another pack, clear the codes, and fire up the car. See if the check engine light comes back and if so, scan the car to see what codes come up. If you still get P0306, then the failure didn't move, and the coil pack is not the issue (in your case, it's likely to be the wire, since you have new plugs and swapping coils didn't work). If the misfire moved to a different cylinder (one which is now hooked up to the coil pack that was originally firing the #6 cylinder) then that coil pack is bad and must be replaced (another known issue on the A4).
ELECTRONIC STABILITY PROGRAM ( ESP) LIGHT FLASHES TO INDICATE UNSTABLE DRIVING CONDITIONS....WHICH WILL ALSO COME ON IF YOUR ENGINE IS MISFIRES.. CHECK THE COILS AND SPARK PLUGS FIRST THEN GO FOR FUEL..INJECTORS...FUEL FILTER CHOKED..HOPE I WAS OF SOME HELP TO YOU..
Coil packs are a very common problem on the 3.0L ASN engine. Often these are covered under an extended warranty due to the widespread issue. If not push for a goodwill contribution.
If you can delete the faults and see which cylinder misfire returns, and just replace this at first. The others may just be a one off. 3 at once is unlucky (but not unheard of). With 6 cylinders it may be worth carrying a spare.
Multiple misfire codes tend to indicate a problem with the coil packs - it's a fairly common problem with the A4, moreso on the 1.8T than the 2.8 V6, but failing coil packs are never a surprise on an A4.