Replaced 5.4l with 4.6l and now just spins over but won't start.
3 Answers
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 .
1 people found this helpful.
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.
1 people found this helpful.