Coil Resistance
06-19-2006, 04:03 PM
#1
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Car: Z28
Engine: 305
Transmission: T-5
Coil Resistance
1986 Camaro 2.8 MFI
I have no spark, I tested the ignition coil with a multitester, on primary resistance, I got a reading 0.0 ohms, the manual states it should be approx 1.0 ohms-(if higher replace the coil).
On the secondary resistance I got a reading of 11,600 ohms, the manual states between 4,000 to 10,000 ohms (if above 40,000) replace the coil.
If primary resistance is below 1.0 ohms (my reading 0.0 ohms) and secondary resistance is just above the range but not anywhere near or above 40,000 ohms does this mean a bad coil??
Can someone add some clarity to these readings for me. Thanks
I have no spark, I tested the ignition coil with a multitester, on primary resistance, I got a reading 0.0 ohms, the manual states it should be approx 1.0 ohms-(if higher replace the coil).
On the secondary resistance I got a reading of 11,600 ohms, the manual states between 4,000 to 10,000 ohms (if above 40,000) replace the coil.
If primary resistance is below 1.0 ohms (my reading 0.0 ohms) and secondary resistance is just above the range but not anywhere near or above 40,000 ohms does this mean a bad coil??
Can someone add some clarity to these readings for me. Thanks
06-19-2006, 06:39 PM
#2
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Car: 89 IROC-Z
Engine: 355 TPI
Transmission: 700R4
Looks like the coil is OK. It's hard for a run of the mill DMM to be anywhere near accurate at that low a resistance. The 11,600 is a little high, but not so high that you would get no spark.
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