SOURCE: 2003 Hyundai Accent with Engine skip...error code P0300 P0301
I have seen coil packs go bad on several Hyundai Accents, the coils will do exactly what they are supposed to (hence your check with an ohm meter), however, the coils short through the outer casing. Try running the car when it is dark out and spraying the coil packs with water. Listen for clicking and watch for arching from the coils to any metal around them. Look for abnormal detonation marks in the outer casing. My guess is you just need a set of new coils. If the Problem is worse in the rain then you have found your problem. Remember, If your car has been misfiring (as noted by the engine codes you listed), the EGR valve can become clogged and damage can be done to your catalytic converter as unburned fuel detonates inside it (keep an eye out for O2 codes in the future). Also, your new plugs can become fouled, be sure they are clean once you fix the problem. Checking your plugs can also be a useful indication of which cylinder is misbehaving.
SOURCE: MISSFIRE
try unplug the up streem O2 sensor drive the car for a while then check the code if its not p0300 change the O2 sensor
SOURCE: miss fire tried almost everything 2000 accent
How many miles on the car? Have you checked your compression? Are the valves noisy? Is the engine running smooth or a bit shaky? I just had a consistent misfire on a given cylinder, and all kinds of MIL were occurring, and they were ALL wrong! After having the valves adjusted EVERY problem went away!!!
SOURCE: 2002 accent 1.5 no spark..replaced coil pack
hook up a scanner if you have one, check to see if your scanner is registering a crank signal.
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