Replaced 5.4l with 4.6l and now just spins over but won't start.

Asked by Michael Oct 30, 2022 at 01:57 PM about the 1997 Ford F-150 Lariat 4WD Stepside SB

Question type: Maintenance & Repair

3 Answers
38,955

beatupchevy answered about a year ago

Spark + fuel + compression = vroom , You're lacking one of those . It's usually best to go with what the vehicle was designed for .

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307,265

Gene answered about a year ago

Did you used the 4.6 electronics and wiring?

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202,505

Ed92626 answered about a year ago

Even if you used an engine from the same year, computer controls differ. You might need to install the computer from the donor car. And then you'll likely need its ECU and wiring harnesses as well. Swapping engines is something we could do easily forty years ago; but not today.

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