If your saying there is no power to ignition coils 2 and 4, then you just have a wiring issue from the black wire between the IG2 relay and those two ignition coils
But if your saying that they has power but the computer is not grounding them to tell them when to fire the spark, then this would be a computer related issue. The valve timing could be off (timing belt
) or the crank sensor could be bad. I have seen a bad trigger wheel that the crankshaft position sensor reads causing this no spark condition on certain cylinders if it is damaged. However, if the coils have power and the crank sensor signal to the PCM is good when cranking the engine over, I have a feeling the PCM is bad and needs to be replaced.
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