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Ford Crown Victoria | Mercury Marauder | Grand Marquis | P71 Forum for discussion of the Ford Crown Victoria, Mercury Marauder, Mercury Grand Marquis and P71.

 
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post #1 of 6 (permalink) Old 03-29-11, 01:41 AM Thread Starter
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P74 TO P71

Will a P71 PCM work in place of a P74 PCM ?

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post #2 of 6 (permalink) Old 03-29-11, 10:20 AM
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Re: P74 TO P71

I never tried so I can't say.

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post #3 of 6 (permalink) Old 03-31-11, 10:35 PM
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Re: P74 TO P71

Depends on the year, but generally: yes.
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post #4 of 6 (permalink) Old 11-24-11, 03:54 AM
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Re: P74 TO P71

As long as you don't have air suspension, you should be all set. Be sure to run it on at least 91 octane and hold on to your socks cause the swap WILL wake the car up.
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post #5 of 6 (permalink) Old 11-24-11, 06:00 AM
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Re: P74 TO P71

We need to know the year of your car first because some year PCM do not inter change with other year cars
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post #6 of 6 (permalink) Old 11-26-11, 07:12 PM
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Re: P74 TO P71

I just got an 03' P71 PCM for my 01'GM. I dropped it in and my car ran like crap. It shifted REAL nice but couldn't get any acceleration. Temp light stays on as well.
I have a suspicion that this PCM may be for another year. You get what the salvage yard gives you. I will tinker tomorrow. Meanwhile, I'll try to find a web site to decode the part number and find out what year it really is.
I was told that it might need a "re-learn". Anybody got any knowledge regarding this?
Anyway, I "MAY" have a PCM for sale, CHEAP............
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