Mustang GT 4.6 into a Marquis

10

Asked by Jan 23, 2016 at 02:58 AM about the 1995 Mercury Grand Marquis

Question type: Car Customization

I have a 95 Mercury Grand Marquis 4.6 with a
blown motor I bought a 96 Mustang GT 4.6 engine
and transmission that I was going to put in my 78
Cobra but decided to go old school 351. Can I put
the 4.6 Mustang GT motor in the Marquis? Will it
bolt in straight in or will I have to change the intake,
etc. Will the Marquis ECM control the 4.6 out of the
Mustang?

5 Answers

69,275

No. A 1995 model is OBD I. A 1996 model is OBD II. Completely different computer systems. HTH. -Jim

10

Can I just buy a 96 ECM and will it plug into a 95 wiring harness?

1 of 1 people found this helpful.
69,275

You'll have to change the wiring harness, sensors, etc. OBD II systems are completely different and use additional sensors as well. HTH. -Jim

Your crazy. They change from obd1 to obd2's in the early 90's. 95 and up are obd2. So glad you didn't put that crappy 4.6 in your antique mustang. And if they didn't so what still same motor just change your sensors out and put it in. Yes should drop right in and bolt right up. 33 years in mechanic experience and I own 2 96 mustangs and they are both obd2. My neighbor has a 95 mercury grand marquis and his is obd2. So don't know where other guy got his info but he is WRONG....

69,275

Sorry, Rich1977, but you're the one who's mistaken. 1996 and newer are OBD II. Some late production '95s were produced with OBD II technology, but not many. So since I obviously can't see this vehicle it's safe to assume it's OBD I. It may also interest you to know that OBD I vehicles came on the scene in 1981. You won't find the ALDL connector under the dash though. That didn't become standardized until '82 and a bit later at some manufacturers. Then you have vehicles from that time period like my '86 Chevy Pick Up which I bought brand new. It was not computer controlled at all. It's like anything, when something is new, anything goes. Once the vehicle manufacturers and the Federal Government decide it's a good idea and it works regulations are put into place to standardize it. You are aware that emission control regulations go back to 1968 ('66 in California)? HTH. -Jim

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