Anyone know how to test the coils on a petrol engine.
They are the ones which have a seperate coil on each spark plug.
I checked the resistance, but it's an open circuit I think as there is no reading on any coil.
BOL said to do what I did.
Also are there any other potential causes of a slightly rough idle on this type of engine (renault 2.0 16v 140Hp F4R)