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Cam Sensor Installation and Adjustment


Two Notes:

    1) The cam sensor has nothing to do with ignition timing.  That is controlled by the chip.  It locates cylinder #6 so that both injector pulse and ignition spark will be on the correct cylinders.  Rotating it like a distributor does not affect actual spark timing.  It is either right, or it is wrong.

    2)  If you have bought the Casper's replacement cap with the led in the top.  Use the instructions that came with it instead of the below. 

This method is proposed by Chuck Leeper of Cody Motorsports.  It uses the Caspers Cam sensor tool rather than a volt meter but the technique is valid for either.


For an in depth discussion of the cam sensor function, go Here.

*Rotating the sensor CCW after the initial setting point may be folklore, but, many have found it to make cars with larger than stock cams run a bit better and reduce the tendency toward detonation.  The theoretical guys say it cannot help...but, I have seen it more than once so I do it on my cars. 

Lately, I have seen it fix part throttle, low boost miss problems in cases where the vertical play in the shaft was causing the reluctor window to get out of synch with the fuel timing window. The correct way to fix this problem, obviously, would be to reduce the vertical play in the shaft.


The following pictures were provided courtesy of Chuck Leeper, Cody MotorSports.

This picture shows the cam sensor drive and cap assembled with the Cam Tool plugged in.  This one is from ATR.

Dot goes toward the passenger side fender when inserting drive assembly.  Remember, engine must be sitting at 25 degs ATDC!

Window will be pointing toward the drivers side fender when inserting drive.

Top view of drive assembly.  The wheel must be pinned into place so that it cannot rotate versus the drive gear.  If the wheel moves, it will screw up the fuel timing and the car may not start, or, it will run very badly.

Voltmeter procedure from the shop manual below.