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I have an automatic 1993 honda accord and i've been driving on d4... is there a different time i should be driving in d3?

 
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For snow, and heavy rain only. It gives you extra torque, and also burns more gas. Play w/ it, you'll feel a huge difference.

 
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your automatic transmission is a 4 gear transmission. 1st,2nd,and 3rd, are power gears. 4th is an "overdrive gear"















by selecting D4 , you allow your engine to use all gears. the Overdrive or D4 is a special gear meant for highway cruising that acually allows the the the output speed to the wheels to be greater thatn the output of the engine to save fuel and engine wear, that is why RPM are lower in 4th in comparison to the relative speed of the car, the trade off is less torque and therefore more sluggish acceleration. switching down to D3 disables the overdrive, you will notice your RPMs being much higher thatn usuall and when you let go of the gas the car slows down on its own much faster , this is called engine braking.for normal driving use D4, use D3 only on steep uphills and downhills and when you are towing something . also when driving in icy conditions under 60mph