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Jumper the A and B terminals of the scanner box.

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Q: How do you disconnect the timing advance on a 1991 Cadillac deville?
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The timing should be set to Top Dead Center (TDC), but you must disconnect the electronic spark advance feature. Unfortunately, I don't know how to disconnect the spark advance. The timing chain is all that can be set. There is no way to set the timing as the distributor is not adjustable.


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You don,t disconnect the computer on any car to adjust base timing. That,s what runs the car, you disconnect spark advance and that varies according to make and model. Take note if your car does not have a distributer and it,s a coil pack you can not adjust base timing that is done by the computer only. If your car has a distributer I would contact a dealer or get a Chiltons manual on how to set base timing. I could not tell you how to disconnect the advance on your car not formilar with your distributer