7.3L IDI vs. 7.3L Power Stroke: How to Tell Them Apart

Two engines, one size

Both are 7.3 liters, and both appeared in Ford's heavy-duty pickups, which is why they get confused. They are not the same engine, and the names shouldn't be used interchangeably.

The 7.3L IDI

• Indirect injection
• Offered from the 1988 model year to mid-1994
• A factory turbocharged version was offered in 1993–1994
• Followed the 6.9L IDI, offered for 1983–1987

The 7.3L Power Stroke

• Direct injection, turbocharged
• Introduced in mid-1994, often called "1994.5"
• Offered through 2003

Which trucks had them

In this era, these diesels were offered in F-250 and F-350 heavy-duty pickups, not the F-150. If someone describes a diesel F-150 from these years, it's worth a closer look.

How to tell which you have

• Model year and build date: a mid-1994 truck could have either
• Badging on the truck, if original
• Engine-bay photos: a buyer familiar with both can usually tell at a glance
• The VIN engine code and paperwork

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