Why are there loads of different specs of spark plugs? Do they all
>vary that much? I dont mean different brands, just the various spec
>numbers you get. What happens if you use an 'alternative' spec plug or
>even the wrong one?
May as well ask how many different engines are there? How many different uses can they be put to?
With a 4 cylinder engine, what happens if you disconnect one of the
>spark plug leads with the engine running? Will it run with just 3 >connected?
That's how you used to find which cylinder was missfiring. Remove one plug cap at a time. The one that had no effect was the faulty one. These days with electronic ignition this is not a good idea, the spark has to find a way to earth and it can destroy the electronics if it goes though them. So the test now is to dissconnect each fuel injector in turn.
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