Engine swap and matching computer system

Asked by #ColeWorld Jan 11, 2018 at 12:31 PM about the 2003 Mercury Grand Marquis GS

Question type: Maintenance & Repair

Hey, If I take a 99 crown victoria
engine and put it in a 03 grand
marquis body will the computer
system match up together without a
problem...

2 Answers

85,095

I would check the two engines share the same torque converter design and rating, also some changes would have to be made to the PCM programming. You would have to keep the 2003 GM's PCM as there are some differences in transmission design between 99 and 03, and the older PCM would not work. If the 99 CV is a police model there are many other issues to address as well.

1 people found this helpful.
50

I have A 90 grand Marquis I would like to swap it over to a 5.3 engine Anyone have any suggestions on what I would have to do

5 people found this helpful.

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