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im just curious what it does, i see it fits on the exhaust cam so i assume it sees cam timing but what does it do exactly ?

thanks
 
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yep thats correct. The YB motor has a phase sensor in the dizzy which tells the ECU when No1 cylinder is going to fire , where as the RB CAS tells the TDC and the phase signal from 1 unit. They do wear out thou , the opitical sensor inside the CAS seems to give out incorrect information as they get older.
 

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its actually a cam angle sensor but most people call it a crank angle sensor, remember that if you ever reindex or alter the cam timing , it will obviously alter the crank timing ....
 
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