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Old 06-12-2002, 04:06 PM
Posts: n/a
1973 SL 450 Ign. Coil Resistance

I am trying to find the reason for a backfire and missing on this car before it warms up. I checked timing with a light and the firing seems to be skipping hits randomly. The higher the RPM the more misses. I checked the coil primary resistance and it is only .5 ohm. The secondary is around 9.6K ohms.

Can anyone tell me if this is bad? The parts store in town says the book primary resistance is supposed to be about 1 ohm.

The points and rotor look fine. The dist. cap is clean and I just removed some minor carbon deposits from the contacts. Plug wires look ok and ohm out around 5 K ohms a piece.

Am I looking at the right area???

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