L31 into an '86 Regal Limited V8

[DRIVEN]

Every Chiltons and Haynes manual I've ever seen prints all the circuits together and all in black and white. I would suggest going to a local independent repair shop and explain what you are doing. Most independents have either Shopkey (which is Mitchell On Demand) or AllData or both. I prefer Mitchell. Ask if they would be willing to print out the wiring diagram for you. Offer to pay for it (they probably won't charge you but it's a nice gesture). If they have Mitchell it will be the "Engine Performance" wiring diagram and will be 3 or 4 pages. The nice thing is that it will print the circuits in color; pink wire will be pink line, black wire will be black line, etc. It also doesn't have circuits that don't apply such as ABS, traction control and anti-theft which makes it easier to follow. When you're done you can keep the pages in your glovebox.

 

[ATL Regal]

Thank you very much for this information!

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[Doober]

Check fullsizechevy.com too, somebody there may be able to help with the swap.

 

[RUDE DOG]

Ive been trying to find a pinout on the c100 connector but havent found anything good, but i have a friend at a local shop that might be able to give me a printout of that pinout. The p101 connector on the passenger side i found with a search, heres some pics with the info:>)

 

[ATL Regal]

Ok, I'm delving into the engine harness. I wrote down the wire location and color for all the ECM connectors, then I went to a Midas shop and got the ALLDATA diagrams for the ECM connectors.

There are some discrepancies with a few wires, they are as follows :

BLUE ECM CONNECTOR

Pin 15 wire color is yellow/black, but ALLDATA says it should be white.

Pin 23 is black/white and ALLDATA says it is "Not Used"


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[ATL Regal]

Red connector

Pin #'s color(s)
1. Blank
2. Blank
3. Black
4. Yellow w/ black stripe
5. Blank
6. Lt. Green
7. Brown
8. Blank
9. Green w/ white stripe
10. Brown
11. Lt. Green w/ black stripe
12. Red w/ black stripe
13. Lt. Green w/ white stripe
14. Lt. Blue w/ white stripe
15. Black w/white stripe
16. Yellow w/ black stripe
17. Blank
18. Blank
19. Blue
20. Blank
21. Lt. Green
22. Tan
23. Yellow
24. Blue
25. Blank
26. Black
27. Yellow w/ black stripe
28. Yellow
29. Lt. Green w/ black stripe
30. Lt. Blue w/ black stripe
31. Lt. Blue w/ black stripe
32. Pink w/ black stripe

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ALLDATA doesn't have a 29
And has 26 as "Not Used"

What the hell?


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[ATL Regal]

GRAY or CLEAR ECM CONNECTOR

Pin 7 & 8 are "not used", but according to ALLDATA they are the "Input Speed Sensor Low, and Input Speed Sensor High", respectively. Pin 7 has a footnote that its for 4L80E Only, is it safe to guess that the same is true for Pin 8, too?

Pin 14 is Dark Blue, but ALLDATA has it as "Not Used"

Pin 18 is Black, ALLDATA has it as Black/White.

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[ATL Regal]

BLACK ECM CONNECTOR

My Pin 6 is empty, ALLDATA has it as "Auxiliary Fan Relay"

Pin 7 is Green, ALLDATA has it as "Not Used"

Pin 12 is Black, ALLDATA has it as "Not Used"

Pin 15 is empty, ALLDATA has it as "Shift Control Lamp"

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[ATL Regal]

And where do I find out which pins to take out?

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[ATL Regal]

anything?