97gts -> 93pgt motor swap....problems? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

12-23-2001, 13:49

Straight motor swap, are there any problems I might run into with this? I need to know asap, gonna be getting the engine this week... Also, anyone know approximately how much it is to rent an engine hoist? Where to rent one? Thanks!

Pat_SOPOC · 12-23-2001, 14:24

they are essentially the same motor. HOWEVER, the 97 was OBDII whereas 93 was OBDI.

You will most likely need a 93-95 ECU and wire harness. Plus, you will have FEWER O2 sensors with the 93. So, you may need to have sections of your exhaust redone.

Just some things to consider.

Pat_SOPOC · 12-23-2001, 14:26

Ok, I see now, you are dropping in the 97 to the 93? Damn, I'm confused! LOL

Well, you get the idea. You'll need the correct year ECU.

12-23-2001, 15:53

Ok, yea, the 97 motor is going in the 93 car. If i take his ecu then i will need the extra o2 sensors, however if i use mine i will not. That is how i understand it. Is this correct?

EatMoreCow · 12-23-2001, 16:57

Quote:

Originally posted by cre3d
Ok, yea, the 97 motor is going in the 93 car. If i take his ecu then i will need the extra o2 sensors, however if i use mine i will not. That is how i understand it. Is this correct?

Your PCM won't work.
Your '93 computer is OBD-I & the '97 is OBD-II.

You're going to need the PCM that matches the engine (which is OBD-II), or it'll never start because the engine is going to be expecting OBD-II format signals, and the PCM will be sending OBD-I format signals, and vice versa.

The PCM & engine won't be able to communicate, leaving you dead in the water.

12-23-2001, 18:12

pcm... what is it?

Pat_SOPOC · 12-23-2001, 21:47

You'll need the ECU (PCM). The Enginge Control Module, or Powertrain Control Module. The 93 ECU WILL NOT work for a 97 motor. At least this is my understanding.

12-23-2001, 23:42

Are you absolutely positive of that? I need to know for sure, this is very important as he has already sold his ecu... If you are positively sure of this please let me know!

Pat_SOPOC · 12-24-2001, 11:47

Well, if it is a DIRECT swap you'll need the ecu.

But, I'm sure there has to be a way to make the 93 ECU work. I know that there are more vacuum lines on one of the intake manifolds. I also know that if the car is a California Emissions car it has some extra doo-dads.

You may need to swap over the 93 IM to the 97 or something like that.

Either way, I'm sure you can MAKE it work.

12-24-2001, 13:13

the 93 ecu should work fine.

Most of the OBDII stuff has to do with emissions, ie; extra 02 sensors, precats in the exhaust manifolds, etc.
The actual motor itself is almost identical.

Trying to use a 97 ecu on a 93 setup probably wouldnt work.
so as long as you are not trying to swap exhaust manifolds and y-pipes you are going to be fine.