How many cylinders in a ford 2003 cargo van E150?

That would depend on what size engine you have in the 2003 Ford E-150 :

GASOLINE engines

4.2L V6 ( 6 engine cylinders )

4.6L and 5.4L V8 engines ( 8 cylinders )

6.8L V10 ( 10 cylinders )

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There is also a 7.3L DIESEL V8 engine available ( 8 cylinders )