This problem has gotten progressively worst over the past few months. At first I would only notice it when accelerating on the highway where the engine would skip at random times. Now it happens almost all the time but not as bad as it would be running on 3 cylinders.
I have replaced the plugs and wires.
Compression is good in all cylinders.
I tested the coil packs with an meter and got on pack 1/4= 14.5K Ohms and 2/3= 13.4K Ohms
Are those reading OK?
If not the coil packs what else?
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.
I'd suspect a sticking injector--car should have set the check engine light. Read the code(s) to progress further. If the coil pack were a problem, it would not be likely to fix itself. If the codes indicate an injector problem, try an injector cleaner in the fuel--worst case, replace the bad injector. The codes should indicate which cylinder to change the injector.
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I just bought and installed new coil packs and get the same symptom. I'm thinking about changing the fuel filter for good measures but after that I am lost.
Any ideas?
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