jake, I have a 2002 jetta 2.0 and I am having a problem with the number 4 cylinder. I have done the following things to the engine. The reason I started working on the car is the timing belt
. I replaced the beltt, the water pump and the tensioner. The engine started right up after doin th timing belt. That being said the #4 cyl showed P0304 and so I did the following items.
Replaced all four plugs
replaced all four fuel injectors
ran compressiion test 120 psi
changed the # ***** wire to the # ***** position, no change
put a noid on the fuel injector wire
took a can of brake cleaner and looked for an intake leak
replaced the coil
spraded salt water on coil
took plug out and checked the spark
the motor runs on the three cylinders fine
I am out of things too try.