'89 motor swap.

I just recently bought an 89 GTS and found out shortly after that there was a MAJOR oil leak which lead to a blown piston. I found a new motor out of another 89 GTS and we started swapping parts over last night. Allready I've noticed a few minor differences. We were thinking maybe the new motor was out of a car with ac. Was that an option on the 89 gts? The difference was the tensioner pulley on the alternator belt was smooth not grooved so in looked like the back of the belt was supposed to go on it. Another thing was the oxygen sensor in the exhaust manifold on the new motor. on my car it was on the lower exhaust pipe. Is the wiring harness going to be completely different on the new motor? What about the computer will that work with this?

The car is over at my friends shop so I can't check any of the parts numbers but I'll try to get them tonight and post it up here.

 

Your new motor had AC. Not a problem though. Just swap over the tensioner and all of the altenator mounting parts from your original motor.

And it sounds like the new motor might be from a different year than you thought, as sr5 suggested, though I've never actually seen a 88-89 motor personally. You did say that your car came with the o2 sensor on the lower pipe, but the new motor has it on the manifold, right?

I did previously do a lot of research in the BGB (toyota repair manual) to find out the electrical differences between the 86-87 and 88-89 motors. They are as follows:

1)The 88-89 motor had a temp sensor for the egr system. The 86-87 does not. (assuming you are in a country that had egr)

2)The 86-87 motor had a single wire o2 sensor. The 88-89 motor has a four wire o2 sensor.

Because of these 2 reasons the ECUs are not interchangable.

I'll let some one with more experience with the 88-89 motor help you work around this, but basically you would want to use the intake, head, and exhaust mani of the engine that you are using the ECU and wiring from, if possible.

It would help to know what you got with the new engine - wiring, ecu etc.

 

I dont think this was the original motor to the car it came out of. The place on the intake where the egr and stuff was is plated off. The wiring harness looked the same as mine though. All the wires matched. Heres some pictures of the new and old.

 

ok Im retarded. the wiring harness was different. apparently the other car didnt have cruise. so we swapped out the wiring harness. so whats the deal with the egr block off plate?

 

well I started it up today and it seems to run great. just need to finish up a couple things tomorrow and it should be good to go.