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Hey Faith==You don't. It is electricaly controled. GoodluckJoe
how about the camshaft, valve timing, if the chain jumped on the sprocket wouldn't that cause timing to be off?
I believe 1985 Regencies had a distributor cap and was adjustable. 1986 and on are "fixed" and computer-controlled. Nothing you can do on it. If your car is "pinging" on acceleration or while going uphill, try the next higher octane gasoline. My 1990 Regency pings on regular gas, I have no problem on midgrade.
GMS
Another member brought up a good point: if the timing chain jumped a tooth on the sprocket, the timing would definitely be off. What are your symptoms/reasons for wanting to adjust the timing? GMS
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