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Old Yesterday, 09:47 PM   #1
dakeller025
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how to test a coil??

hello, i have a 2008 ford focus se with 2.0. i have been having some idleing issues.i posted the other day about them and someone suggested a bad coil. i am new to these coil issues and have never tested one and was wondering if someone would steer me in the right direction of how to properly test them and what ohms they should be at....i have a decent multimeter.thanks in advance for any help.


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Old Yesterday, 10:12 PM   #2
Humphrey
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You use a ohms meter to test them. Most volt meters has a ohms setting. You test them cold and hot meaning you run the engine for a while so the coil heats up.
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Old Yesterday, 10:16 PM   #3
harrison.mike.j
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You can check the resistance of the coil with the ohm meter. May indicate a bad coil but it may behave differently when hot and operating. Compare resistances of each coil to one another when cold and when warm. if one is way out from the others it may have an open or shorted winding.

If you have a misfire, you can swap the coil with one from another cylinder and see if the misfire follows the coil or not.

Also there is a pretty skookum tool here that shows you if the coil is firing through induction: http://youtu.be/y7YMMlR8wc4

http://youtu.be/jbJkoX_I_WM

Most importantly, do not remove the coil and allow it to fire without proper grounding. You risk injuring yourself, fire, or damaging sensitive electronics.
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