Quote:
Originally Posted by bergmjh
The sensor should have an ohm reading of 750-1000 ohms cold. If the sensor reads 1000 to 1200 ohms cold it is marginal and should work with the engine cold. 1200 ohms and up is a bad sensor. The later models that use the sensor for ignition firing use the same style of sensor. Just in a different package. John
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On which engine? From my notes the RPM sensor on an OM-617 (the one near the harmonic balancer) should be around 80 ohms. It's resistance should not change much.