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i still have same code po303 i have change spark plugs and coil i add a ground wire i can resat end drive for 20+ milages no check enigine light turn off start up runs for minute or so then coms back on check enigine light same po303 enigine runs very smoth no vibration what so ever I AM LOST
If your getting a P0302 ( cylinder #2 misfire detected), the first thing to check is the spark plug. If it's new then the next thing to check is the plug wire. If it has individual coils, then swap it out with another one and see if the misfire moves too. If so then the coil is faulty.
there are three retainers that hold the top cover onto the valve cover. Remove that cover. You will then see four coils. Uplug and remove the four coils they will just pull up. The 4 spark plugs will be under the coils.
They should be under a compont called the coil pack , its 4 HT coil assy's assembled in a row that fit directly on to the spark plugs(no plug leads ) so you are looking for a rail type componant usually with a multi plug at one end and possible two fitting screws on the inlet manifold side under the plastic cowling that VW love using . Good luck
no flashing light and rough shaking will be part of spark plug but also a very bad miss fire. I am going to guess that your engine is a 1.8t if so you have 4 coils that sit on top of your spark plugs that most likely are arcing you will need to figure out which coil is failing or you can save yourself the trouble and replace all 4 and the spark plugs. before you do that though check your wireing going to your coils look for broken wires or the ground that is next to the #1 coil that is the one closest to the front of the motor and you. hope that helps. that will be the start to fixing your issue also when you pull out the spark plug look down the hole first and make sure that there is not oil in the bottom of the hole if that is the case you will need a valve cover gasket as well. good luck hope that helps