4WD - 10/23/2018 21:54
I'll add a picture, of the "Early style" 3406E model RPM/Timing sensor.
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When I used to work for cat you could pretty well diagnose the bad cam sensor by tapping on it with a wrench or socket extension or something of that nature, but not hard cuz it can break off. Then try to start the truck . limped a lot of semis into the shop hundreds of miles away where I could replace the sensor
3406E cranks but won’t start
