How do you test a coil pack?
It's distributerless, single coil pack ignition system.
I don't know how to check it's working 100%, it's coming down to this or the o2 sensor for rough running / misfiring.
The o2 sensor has caused a code to be thrown (compensation out of upper range limit) but no check engine light. When i hook it up to vagcom / vcds on the laptop, the o2 sensor is still switching ~8 times in 10 seconds when the engine's all warmed up.
The car runs slightly rough when first started. A little accelerator clears it for a few seconds. When the car's warm it's running terribly, revs up and down like a yoyo at idle, almost stalling.
This all just confirms it's the o2 sensor doesn't it... still i'd prefer to know a way to test the coil pack. Plugs and HT leads are new.
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Volkswagen Golf IV - 98 1.6 Testing a co.. new