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Coil resistance readings 900

posted by  Art Benstein on  Tue Oct 8 07:19 CST 2019
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last visit: Fri Oct 17 20:10 CST 2014
[RELATED]

Way too many coils have been changed needlessly because of those resistance "specs" and car owners applying a common multimeter to read them.

Unless you can test your meter's calibration with some precision resistors, in the range you're using it in, take those measurements with a grain of salt. Definitely don't buy a coil because it measures 1.5 ohms, and remember the temperature (internal) makes that number vary quite a bit.

Soapbox item for me would be to insist every consumer-targeted DMM come with a small assortment of resistors to check each range, in the same vein as Spook's suggestion to test the voltage scale with a battery. Once you accidentally measure resistance on a powered circuit, the meter's probably incurred damage.

I've worked on a lot of Volvos and have yet to come across a Bosch ignition coil that needed replacement.
--
Art Benstein near Baltimore

Two secrets to keep your marriage brimming
1. Whenever you're wrong, admit it,
2. Whenever you're right, shut up.
-Patrick Murra






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