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Message: <blockquote data-quote="jarance" data-source="post: 54726" data-attributes="member: 21">For high resistance, you need a good insulation resistance. i.e. no leakage. you may ask why?. Well, the required current flow for ignition is very small but you need a very high voltage in order to create the spark or arc (in this case, the break down of the the air.)If there is breakdown in the insulation of the HT cable, the energy is prematurely divertly to the ground before it could reach the spark plugs. This will cause misfiring or high vibration because one piston is not firing. However, it would will NOT stop the engine from starting. (The possibilty of 4 or 6 HT cables failing at the same time is almost impossible)Based on your discription of your problem, you could be facing a crank sensor problem. If you have a crank sensor failure, the ecu would go to fail safe mode and cut power to the fuel pump and the ignition coil.</blockquote>