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> Is My Ignition Coil Bad?
ElantraBoy98
post Oct 24 2009, 12:13 PM
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Member No.: 74,060
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Drives: 1998 Elantra Base



I've been getting uneven idle. New plugs, new wires, clean throttle, clean IAC, clean MAF. No misfire codes.

Tested coil resistance (cold engine):
Primary:
bet 1/3 : 0.9 ohms
bet 2/3 : 0.8 ohms

Secondary:
bet 1/4 : 10.3 K
bet 2/3 : 10.3 K

hmaservice specs:
primary - 0.5 ohms +/- 0.05
secondary - 12.1 K +/- 1.8K

The resolution on my multimeter is 0.1 ohm at the lowest range setting of 200 ohm. When I short circuit the test leads, my reading is 0.1 ohm.

The primary resistances are above the high end of the spec range but they are about even with eachother.
The secondary resistance is exactly at the low end of the spec range.







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99son
post Oct 27 2009, 01:51 PM
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Drives: 1999 sonata 2.4L



doesnt seem as though it is from the readings you gave. are there any other tests that should be done that are given in the manual? Sorry used to working on motorcycles.
think I am remembering one other test tho.
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EdGasket
post Oct 28 2009, 01:40 PM
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Drives: Hyundai Lantra GSI 1.6 2000



I had uneven idle; resetting the ecu fixed it. Baiscally just disconnect the battery or pull the ECU fuse, step on the brake pedal to discharge any capacitors, leave for 15 minutes to make sure, then reconnect. If that doesn't work, test the throttle position sensor with your voltmeter.
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