4cyl to 5.0 swap?

89bluegt · Mar 12, 2007

I'm in the process of converting my 4cyl 89 coupe to 8cyl. So far I have changed the front suspension, engine and tremec trans. Now I'm trying to wire everything back up. I think I have everything connected exept for the wires that go to the trans and there is a set of 6 wires and connector coming from the computer harness that the 4cyl dash harness doesnt have a mate for. Here is a pic of it. Could someone tell me what it is used for? Any help will be greatly appreciated.

89bluegt · Mar 13, 2007

v8only · Mar 13, 2007

i'm assuming that your car was an auto, and you've added a 5 speed to it, if so, just be sure that all the 5 speed harness wires are connected at the dr side kick panel, and that you plug in the plugs taped up under the clutch pedals and you'll be ok

89bluegt · Mar 13, 2007

Both cars are 5 speed. Everything is connected except this. The donor car has the mate to this plug and the wires run up behind the dash into the maze of wires back there. Here is a pic of it. The 4cyl car does not have this.

greg251 · Mar 13, 2007

what year harness are you using in the 89?

89bluegt · Mar 13, 2007

An 87 5.0 harness was used.
Here is a pic of the 4cyl harness from firewall to computer. Everything is the same except for the missing connector.

And a few other progress pics. I still have to put the fuel lines on.

The rear is a little high. Its because I haven't changed the rear stuff over yet.

SVT32VDOHC · Mar 13, 2007

89bluegt said:
I'm in the process of converting my 4cyl 89 coupe to 8cyl. So far I have changed the front suspension, engine and tremec trans. Now I'm trying to wire everything back up. I think I have everything connected exept for the wires that go to the trans and there is a set of 6 wires and connector coming from the computer harness that the 4cyl dash harness doesnt have a mate for. Here is a pic of it. Could someone tell me what it is used for? Any help will be greatly appreciated.

My 91 Notch is a 4cyl to 8cyl swap. I used all 92 GT stuff.....If I remember correctly, I think I had that same connector left free also. I was pist when I was putting it together, and I couldn't figure out what it was for. If I had that I left it hang free.

Is that on the passenger side kick panel?? IF it is I had that too.

89bluegt · Mar 13, 2007

Yes, Its on the passenger side kick panel. I guess I'll try to start it up unplugged when I get the fuel lines and tank changed over.

SVT32VDOHC · Mar 13, 2007

Yeah, do that, I'm sure you did everything right, you will know soon...good luck!!

89bluegt · Mar 13, 2007

Thanks. I wish I knew what it was for though.

ls1beater4eva · Mar 13, 2007

ok well i know my car is a 93 but my 88 had a plug like that im not to sure about it but is it the for the fuel pump

89bluegt · Apr 3, 2007

I tried starting the car with the 87 harness in my 89 car but it didn't start. I bought an 89GT harness on Ebay, installed it and she fired right up. Thanks for the help!

kaylexty · Apr 3, 2007

how hard was 4 cyl to v8 swap? other than the plug prob any other difficulties with wiring etc?

SVT32VDOHC · Apr 4, 2007

It is easy. I had both cars stripped, and one car done and running in three days..by myself. I had no help pulling, swapping or installing my motor/trans/wiring/clutch pedal box. I went from auto to stick, and swapping the clutch pedal box took the longest. I had a hoist and air tools, which helped me out.

GET A DONOR CAR!!!! That will make things fast and easy. Try to find two cars the same year or 1 year apart. I had a 91 Cyl Coupe and a 92 GT v-8. Easy swap, everything was the same!!!

gunmetal5.0 · Apr 4, 2007

Congrats on everyone who did this swap. I did a t5 swap and put in a different 5.0 engine also. For me the most time consuming was the pedals also. Was way easier when I just took out the drivers seat and removed the dash. Then it was fairly easy. I decided to go with carbed though. The person who had the car before me hacked up the harness so bad which is part of why I just got a universal wiring harness and totally rewired the whole car. Was a fun project though and I learned a lot. EFI is great when it's all there and complete but boy is it a nightmare if it's not lol.

SVT32VDOHC · Apr 4, 2007

gunmetal5.0 said:
Congrats on everyone who did this swap. I did a t5 swap and put in a different 5.0 engine also. For me the most time consuming was the pedals also. Was way easier when I just took out the drivers seat and removed the dash. Then it was fairly easy. I decided to go with carbed though. The person who had the car before me hacked up the harness so bad which is part of why I just got a universal wiring harness and totally rewired the whole car. Was a fun project though and I learned a lot. EFI is great when it's all there and complete but boy is it a nightmare if it's not lol.

Sometimes pulling the dash makes it easier, I didn't do that on this car. But I did have the driver seat out. Boy those seat studs that stick up out the floor sure are hell on your back!!! I was all cut up, but my adreniline was pumping and it was 90* that day, and I wanted it done!!!

89bluegt · Apr 4, 2007

SVT32VDOHC said:
Boy those seat studs that stick up out the floor sure are hell on your back!!! I was all cut up, but my adreniline was pumping and it was 90* that day, and I wanted it done!!!

Been there!

kaylexty said:
how hard was 4 cyl to v8 swap? other than the plug prob any other difficulties with wiring etc?

No other problems.

kaylexty · Apr 4, 2007

ok thanks i have a 91 5.0 vert but ive never been much of a convertible guy so id like to find a notch, but most of the ones i see that are reasonable price are 4 cyl.

4cyl to 5.0 swap?

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