engine compatibility question - 1998 Mustang GT with 4.6 - Ford Mustang Forum
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post #1 of 16 (permalink) Old 06-09-2008 Thread Starter
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engine compatibility question - 1998 Mustang GT with 4.6

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Recently purchased a 1998 Mustang GT Convertible with a 4.6. engine and automatic transmission. The engine is bad. What will interchange with this engine? Or, what modifications are needed to change to a different year engine. Salvage yards are telling me that only the 1998 Mustang engine will fit.
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post #2 of 16 (permalink) Old 06-09-2008
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1996 to 1998 is the same for all SOHC Mustangs, you can install a 1999 to 2004 4.6 SOHC "PI" engine, which has better intake manifold, cylinder heads and cams....but you will have to change the front timing chain cover to your year and if you get a 99/00 you'll have to get a different flywheel to as your car, being a Romeo engine has a 6 bolt flywheel and 1999/2000 are Windsor engines and have a 8 boly flywheel....
post #3 of 16 (permalink) Old 06-09-2008
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Also, I think the older Town Cars from like around 92ish had the 4.6. They are the same engine block so there are probably going to be a few wrong parts, but if you have both the engines, it should be changing one part with another.

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post #4 of 16 (permalink) Old 06-13-2008
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4.6L engine codes, X or W

I also own a 1998 Mustang GT with a bad engine. Some people I have talked to say I have to replace it with an "X" code engine out of another Mustang, while others say any 4.6L sohc will work. I have a good 4.6L out of a 1999 Crown Vic with a "W" engine code, will this engine work? Are the "specs" the same for W and X code engines as far as horsepower and torque?
This is my first "modular" engine and I am confused about what will work and what won't. Please help! Thanks!
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post #5 of 16 (permalink) Old 06-13-2008
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that whole "W" vs "X" code is ********, meens absolutely nothing when talking about Mustangs...yes you can use that Crown Vic engine but you will have to swap-out the front timing chain cover, as your car has 2 coil packs and the '99 C/V has 8 COP's (coil on plugs) and there is no place to mount the coil pack brkts on that engine
post #6 of 16 (permalink) Old 06-13-2008
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Thumbs up Thank you, Randy

Randy, you are the Mustang God! Finally, a straight answer from somebody who knows Fords. (even my local dealership and salvage yard said it had to be an "X" code engine or it would not work)
Thank you, thank you, thank you.

I suppose, since I do have to change the front cover, it is not considered a "direct bolt in swap" as another X code engine would be. But if my low mileage Crown Vic engine will work, it's going in the Mustangs engine bay this weekend.
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post #7 of 16 (permalink) Old 06-13-2008
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no problem, if the C/V or Town Car (and a few more) were of pre 1999 than it would be a direcr swap as those models still used plugwires and not COP's...all the HP & TQ #'s should be the same as your 1998 as both are Non-Pi engines...oh and you'll have to swap the plenum, thrttlbdy and fuel rail to yours and maybe the oil pan and crank damper too....
post #8 of 16 (permalink) Old 08-30-2008
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2002 4.6L engine into a 1999 3.8L engine?

randy u are good at this. i am abou to buy a 2002 gt engine with a stick tranny. to put into my 1999 mustang instead of the 3.8L engine. will i have any problems such as computer or anything that will complicated the project. i already have dual exhuast so i know i have to get new headers, i am also going to get 8.8 rear end, and i am getting ebaich lowering suspension but i dont know whether i should get it for a GT or a regular mustang. any help is appreciated. thanks
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post #9 of 16 (permalink) Old 08-30-2008
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Originally Posted by stang4life99 View Post
randy u are good at this. i am abou to buy a 2002 gt engine with a stick tranny. to put into my 1999 mustang instead of the 3.8L engine. will i have any problems such as computer or anything that will complicated the project. i already have dual exhuast so i know i have to get new headers, i am also going to get 8.8 rear end, and i am getting ebaich lowering suspension but i dont know whether i should get it for a GT or a regular mustang. any help is appreciated. thanks

get everything for a GT, including all the engine electronics..ie; wiring harness's and ECM, you'll also need a GT coolant system, hoses, radiator, DeGas bottle, clutch cable and maybe the pedals as the GT uses a different brake booster set-up vs a V6 car and you'll need to upgrade the fuel pump, best bet on it is the SVT Focus fuel pump which we sell for @$95.00....thats all I can think of att but Im sure there will be more.....
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Won't he need to upgrade to GT front suspension and mounts as well? The 4.6 is heavier and bigger than the 3.8.

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Won't he need to upgrade to GT front suspension and mounts as well? The 4.6 is heavier and bigger than the 3.8.
not really he's going wth aftermarket springs, struts are different but only in the valving, so they are not that big of a deal and they all use the same "A" arms, tie rods, ball joints and I think the same strg rack and "K" member, yes engine mounts are different but thats a given....
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Randy I have a question for you. Can I put a 96 GT auto trans in a 98 Gt if I swap the valve bodies and inner wire harness. My understanding is they are the same case and guts, different wireing internaly. I did the swap out but now have all the solenoid codes coming up. So the question is do I have to pull the trans back out or can I change valve body with all the electronics for a 98 and have it work.
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Hello fellow mustangers, I am fairly new to this as well and my 2002 mustang gt has a blown engine. I was told by a local mechanic that a 1997 NPI mustang gt engine would work but after reading a couple forums I'm not sure. I have already purchased the whole parts car and was planning on swapping out the motor and transmission. Can you please tell me if this will work and the downside to doing this? This is about my only option at this point so I am willing to do just about anything to make it work.
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Quote:
Originally Posted by secoy02GT View Post
Hello fellow mustangers, I am fairly new to this as well and my 2002 mustang gt has a blown engine. I was told by a local mechanic that a 1997 NPI mustang gt engine would work but after reading a couple forums I'm not sure. I have already purchased the whole parts car and was planning on swapping out the motor and transmission. Can you please tell me if this will work and the downside to doing this? This is about my only option at this point so I am willing to do just about anything to make it work.
To give you a simple answer: Yes, it will work.

If you can, I definitely suggest you take the cylinder heads, cams, intake, and exhaust manifolds from your 2002 GT and mount them onto the '97 engine. This is often referred to as a "PI Swap". PI stands for Performance Improved, and NPI for Non-Performance Improved. The 1997 NPI engines are rated at 225hp, while the 2002 engines are rated at 260hp. Because the pistons are slightly different in the NPI engines, your compression ratio will also be slightly higher when you put PI heads with PI cams on it. This will result in about 265-270hp at the crank, from what I have read.

I also suggest you keep the transmission from your 2002 if it is in good working condition. 96-98 Mustangs came with gear-driven speedometer, while 99-04 came with a digital speedometer sensor (OSS). It is definitely possible to use the transmission from the 1997, but I am not sure what is required to make it work with the 99-04 computer in your car.

If your current engine is badly damaged and you can not reuse the heads, cams, intake, and exhaust manifold, I suggest you get those parts from another 99-04 Mustang GT at the junk yard. The PI swap can also be done at a later time if you do not want to do it now, but you will probably be disappointed in the power from the NPI engine compared to your PI engine.

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Planned Mods: FLSFC, Eibach Sway Bars, Throttle Body, Plenum, Rims.
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Thank you! I was told that one of the heads have a bent valve. The local mechanic suggested I get another engine because I would have to take the head to a machine shop and with being short on cash I thought it would be cheaper. I am also new to this and do not have the first clue on how to replace the valve. So I cannot put the PI heads on untill I get the valve fixed... but as far as horsepower goes I do not need anything crazy because it is just a daily driver but I also do not want a "terd". Is it possible to replace the valves myself? The initial problem in the 02 was that the timing chain was loose and slapping against the case, I replaced the timing chain tensioner arms and guides as the arm was wore down to the metal. This wouldve fixed it but with me being new and my "mechanic" screwing up we did not crank the motor over hy hand to be sure that it was not out of time or piston hitting any valves. Sure enough as soon as we hit the switch it cranked over about half a revolution and made a weird noise then locked up. Further investigating proved that I had bent a valve because I we cannot get the crankshaft timing mark at 6 oclock and the keyway at 10. I removed the chains and tried moving the cams in every which way but the crankshaft timing mark and keyway will not make it past about 11:40.... it just moves a little in either direction. Maybe it is still possible to fix it? Idk but I have to do something quick as it was my daily. Please give me your thoughts and suggestions. Again, I apologize for not knowing much about this and thank you for all of the help. I can post pics if needed
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