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post #5 of (permalink) Old 11th February 2006
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With the engine running you unplug the injectors one at a time.If when you disconnect one the engine speed drops/misfires worse then that coil is working.If the engine speed/note stays the same then that coil is faulty.
If funds allow then it is usually a good idea to change all four because if your having problems with one of them,then the rest usually go in sympathy a little time afterwards!.
I will reiterate what Webcode says that it really isn't a goood idea to drive your car with a misfire as the unburnt fuel will damage the catalytic converter.
Hope this helps.

I'd rather push my Alfa than drive a BMW....
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