How to check an ignition coil is working properly/in spec

Ptotherice · 06-01-2011, 09:34 PM

One easy way to do it, unplug it, put a bolt where the spark plug goes (make sure it touches the metal in the plug wire, and then hold it near the body of the car. Now make sure you have PLENTY of insulation between your hand and the coil (like a plastic something to hold it far away from your hand). Turn off any of the fuel (pull fuses) and crank the engine over (it won't start) and look for a strong, loud, thick spark with a decently long jump. Don't hold it too close. That sounds harder than it really is, takes all of 2 or 3 minutes.... might try the fsm if it's easy.

06-01-2011, 09:34 PM	#4
Ptotherice Rotary Fan in Training Join Date: Aug 2010 Posts: 39 Rep Power: 0	One easy way to do it, unplug it, put a bolt where the spark plug goes (make sure it touches the metal in the plug wire, and then hold it near the body of the car. Now make sure you have PLENTY of insulation between your hand and the coil (like a plastic something to hold it far away from your hand). Turn off any of the fuel (pull fuses) and crank the engine over (it won't start) and look for a strong, loud, thick spark with a decently long jump. Don't hold it too close. That sounds harder than it really is, takes all of 2 or 3 minutes.... might try the fsm if it's easy.