4.6 to 5.4 swap? BILL....HELP!!! - Power Hungry Performance Forum

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4.6 to 5.4 swap? BILL....HELP!!!

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1997 to 2003 F-150
4.2L, 4.6L, and 5.4L equipped F-150s.

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#26

Sat, December 19th, 2009, 02:36 PM

RobbyMartin RobbyMartin is offline

Bacon King

Join Date: Sep 2009

Location: Yucaipa, CA

Posts: 69

The original PCM is from a 4.6 truck. My replacement engine is a 5.4. What issues will I have and what will performance be like with using a 4.6 programmed ECM on a 5.4 engine? I know Bill can provide a tune that will correct any issue but until I get it what should I expect?

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