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What order do spark plugs go in for 1993 ford explorer V6 4litre?

The firing order for a 1993 Ford Explorer with a 4.0-liter V6 engine is 1-4-2-5-3-6.

This means that the spark plugs should be installed in the following order, starting from the front of the engine:

1. Front driver's side

2. Front passenger's side

3. Rear passenger's side

4. Rear driver's side

5. Middle passenger's side

6. Middle driver's side

For more detailed instructions about replacing spark plugs it's recommended that you consult the specific vehicle manual.