Crank Sensor/Tachometer
 

My tachometer does not work on my 190 E 2.3. When I replaced my water pump I took the crank sensor off to clean it. My tach worked when I put the car back together - for a while.

My Question: Is my tach not working an indicator that I will be having intermittent trouble with the crank sensor in the future?

Thanks
John Mlynick
Shelburne Falls, MA

John, what year car?

On the 1987 & later cars the crank sensor is at the REAR of the engine.
On 1984-86 cars the distributor sends the signal.

The tach signal comes from the ignition module. IF the engine is running then the crank sensor/distributor isn't at fault for the tach being INOP.