Question about 1991 Chevrolet Caprice
You cannot get it precise, but you can either put a vacuum gauge on the manifold and advance the timing to the highest vacuum reading, then backing off a little, or, if it's an automatic, run the engine (in drive) up against the brake (called powerbraking) , advancing distributor in small increments till you hear the engine begin to detonate, then backing off a bit.(don't permit anyone to stand in front of the car if using this method!!!) Both ways will get you in the "ballpark" 'till you can get a light on it.
Posted on May 15, 2009
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Posted on Jan 02, 2017
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