I have a 2002 volkswagen golf gls 2.0. I had the coil pack issue engine was misfiring and I saw the arch coming out of the coil pack when it was damp out. I replaced the coil pack and new wires and everything was fine for about 6 months. Now my car is misfiring and engine is bucking violently. I replaced new spark plugs another new set of wires. Cleaned throttle body had fuel injectors rebuilt. Car will not move-starts runs violently until it stalls or I turn it off. Misfire codes in all cylinders and p102 error but removing the maf doesn't make a difference. Could this be the fuel pump relay? Should I replace the fuel filter? Could the coil pack go bad again. I'm at my wits end.
Check fuel pressure first. If low replace fuel filter as well as pump. Check egr if still misfiring for clogged or pieces in egr system. Also check for holes in grommets or air leaks between maf and throttle body.
November, 3, 2012 AT 4:29 PM
"car will not move-starts runs violently"
Is it possible that you mixed-up a couple of spark plug wires (the second time, since it ran fine the first time)?
2x2 post coil?
November, 3, 2012 AT 5:56 PM
Forgot to mention that (from my experience) when a fuel pump goes bad, the engine either start or not at all.
A quick check of pump health can be checked via an inductive current clamp and a graphing multimeter: