HOW TO: Adjust your timing
From the 1991 Technical Bulletins, Beginning with April 1991 production,
the ignition timing mating mark has been changed as shown below.
NEW marks at 0,5,10,13,white paint,15,20 B.T.D.C..
OLD marks at 0,5,10,15,20 B.T.D.C..
My car was manufactured prior to 1991, but I have six timing marks, not five. Most folks agree that the final mark should be 20 BTDC. When using the timing light, you'll see a short post above the pulley, this is your guide.
It is important to make sure that your idle speed is correct before beginning the adjustment.
Connect your timing light to plug 1 (closest to the passenger side of the car).
Start the engine, and loosen the distributor cap.
Check your timing, you want to be just under half way between the last and 2nd last marks (15/20).
Tighten the distributor once you've set the timing to 17 DTDC.
Source: Jim Wright
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