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I have the Casper's tool and am trying to set the sensor. I turned the crank from 0 to 25, stopped at 25 and then rotated the cam sensor from clock wise to counter-clockwise and locked it down. Now if I turn the crank past 25 degrees and come back to 25, the LED is off by about 25 degrees. There is some play in the cam sensor both up and down (spring loaded) and left to right. Is this too much? The car has 44K miles and the cam sensor has never been touched. If you set it by going from 0 to 25 degree direction then it was off by about 5 degrees ( thats standing in front of car and rotating crank Clockwise).
 

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when you go past and come back, you are putting slack in the timing chain which could throw it off. Did the car run when you finished?
 

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http://www.gnttype.org/techarea/ecmsensors/camsensor.html

mark off 25 degs after top dead center and line that point up with the pointer. Be sure you are on top dead center on cyl # 1 so you won't be 180 degs off. when you are rotating the engine to 25 atdc, be sure you are rotating the damper in the normal rotation direction and don't try to reverse the direction to line it up if you go too far
 
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