Testing an ignition coil
07-03-2016, 04:57 PM
#1
Testing an ignition coil
I have a no spark situation on my B2500 3.0 liter '96. Long story short, I'm testing the coil(s) - I picked up a used one in a junkyard while I was buying a used battery.
I set the coil up with a simple set of wires going to a battery and the coil wire going to a spark plug. When I touch the positive wire to the battery and release, I can not get a spark unless I close the spark plug gap to about the thickness of paper. Even at that, it's a weak spark.
Unless these new fangled coils (I was raised on '60s and '70s cars) do something I don't know about, a nice big spark should jump across that gap even when it is the stock setting of 0.35. - this is a plug for my '71 GTO.
Both of the ignition coils I have do this. The secondary coil resistance of both is is about 10k Ohms. Primary coils are very low - like 1.5 Ohms, just like it should be.
I set the coil up with a simple set of wires going to a battery and the coil wire going to a spark plug. When I touch the positive wire to the battery and release, I can not get a spark unless I close the spark plug gap to about the thickness of paper. Even at that, it's a weak spark.
Unless these new fangled coils (I was raised on '60s and '70s cars) do something I don't know about, a nice big spark should jump across that gap even when it is the stock setting of 0.35. - this is a plug for my '71 GTO.
Both of the ignition coils I have do this. The secondary coil resistance of both is is about 10k Ohms. Primary coils are very low - like 1.5 Ohms, just like it should be.
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labradorian70
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07-22-2014 08:56 PM
