There isn't one.
The distributor is called an optispark, and is located on the front of the engine behind the water pump.
It is at the rear of the engine and has the plug wires coming out of it.
behind the engine you'll see a black circle with 7 plugs coming out of it. that is the distributor cap. take the cap off and you'll see the rotor.
http://www.classiccarauto.com/impala/how_to/images/distributor.png
On the 2.8L V6 the distributor cap is held on with two screws. Unscrew the two screws and pull straight up on the distributor cap to remove it from the distributor.
Which engine.
If your S10 has a 2.2L engine, it doesn't have a distributor cap.
1,8,4,3,6,5,7,2
HmTx5G pxynxujytkcz
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It doesn't have a distributor cap.
That would depend on the year and engine size. If you do not see a distributor then it is distributorless ignition.