No, they go gradually. It's only when they finally miss at idle that you can find the bad one(s). To do this, start the engine, open the hood/bonnet and observe the lumpiness of the idle. Now, one by one, disconnect the electrical connectors on the injectors. If the idle gets lumpier, then that cylinder is good. Reconnect the injector connector and move to the next cylinder. When you find that disconnecting an injector electrical connector does NOT make the idle worse/lumpier, you've found you suspect (You're Nicked!!), repeat for all 5 cylinders in case there is more than one.
Stop the engine. Remove the 1.8T style coilpack, observe any trimming of the hard plastic and rubber boot that has been applied to it. Do same to a new coilpack and install. Voila, everything is sunshine again.
Stop the engine. Remove the 1.8T style coilpack, observe any trimming of the hard plastic and rubber boot that has been applied to it. Do same to a new coilpack and install. Voila, everything is sunshine again.
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