My 4.9 wiring thread (Page 7/16)
Mickey_Moose JUN 24, 09:48 AM

quote
Originally posted by josef644:

Great information. I had run into a little snag on my harness yesterday. My 93 engine still had its injector wiring part of the harness on the injectors. My 91 harness uses two connectors, one for the even bank, and one for the odd bank. The 93 only has one connector on the injector group harness for all 10 wires. I still had 90% of the 93's harness in the garage, and I think I can splice in the 93 injector connector part into the 91's engine group wiring harness. There was only one difference in the color of the wiring to deal with. I had access to the 92-93 wiring off of your thread from FieroAddiction, and Alldata.com, as well as the available 91's harness diagrams. I am gonna lay all of this out on my 4.9 Wednesday morning, and get this all sorted out in a neat and orderly fashion.





Wouldn't it just be easier to use the other injector wiring harness? The less splicing the better (less chance of a screw up, less chance of there being a problem in the furture, etc). but that is just me.
josef644 JUN 24, 12:05 PM

quote
Originally posted by Mickey_Moose:
Wouldn't it just be easier to use the other injector wiring harness? The less splicing the better (less chance of a screw up, less chance of there being a problem in the furture, etc). but that is just me.



I don't have access to the other harness on the old 91 Deville engine. How do I remove the injector harness from the injectors? I havent found that in the books, or on AllData.com.
Mickey_Moose JUN 24, 12:49 PM

quote
Originally posted by josef644:
I don't have access to the other harness on the old 91 Deville engine. How do I remove the injector harness from the injectors? I havent found that in the books, or on AllData.com.



Push the metal 'ring' in and pull off...
josef644 JUN 24, 02:25 PM

quote
Originally posted by Mickey_Moose:


Push the metal 'ring' in and pull off...



Just did one, and it worked great. Thanks
Joe
Fieroseverywhere JUN 24, 02:35 PM
Congrats Josef on getting this far. I have been having problems with my computer deleting all my cookies so I'm not sure which threads have been updated and which have not.

I'm not sure if you saw this yet or not but when doing the wiring for the injectors be sure to use the 92-93 diagrams Mickey posted here in this thread. You will immediately notice a difference between those and the 91 diagrams listed on fieroaddiction.com. The 92-93 diagram actually have everything as it should be. Be careful of one thing though. There are two wires that are the same on the harness (same color). Make sure you put them in the correct spot and check them with a multimeter to be sure. I don't recall exactly but I remember having a problem with that.

If you don't find those diagrams here I can e-mail you a copy also... if I haven't already.
josef644 JUN 24, 08:49 PM
There are many of the same colored wires in the 91 harness. Lots of green and green w/wt stripe. I have been checking them one at a time with the meter. I also set up a battery charger and used a test light to find the correct holes in the ECM plugs faster. If the light is on I had the correct hole. As I removed the caddie C225 connector I soldered the wires back togeather an put heat shrink on them. Every wire was done one at a time, and ohmed out after the soldering. Took a while, but I dont want any errors or crossed wires to figure out later.

This has really not been real bad so far. I now know each wire , and have marked all of the loose ends with tape as to where they should be connected once merged with the C203- C500 harness. I have one connector I don't know where it goes yet, but I am sure once I set this on the engine and start laying it al out I will find the empty sensor or what ever. It was in the engine harness, but was not a part of the ECM plugs wires.

And yes there was two wires different than what was in the 91 diagrams, the # 3, and # 4 in the diagrams were different. I used the correct ECM connector socket to establish the correct injector wire, not the wire color.

Joe

[This message has been edited by josef644 (edited 06-24-2009).]

Fieroseverywhere JUN 25, 09:45 AM

quote
Originally posted by josef644:

I have one connector I don't know where it goes yet
Joe




Can you post a pic of it?

Sounds like you got this all locked down. No too tough, just time consuming. You'll be driving before you know it.
josef644 JUN 25, 11:04 AM
The wire colors are Lt Green, Dk Green, and the black wires come to a common grounding eye. Both had the insulation toasted right at the connectors. Both have a light blue " gruved rubber band seal". If you want an un compressed photo PM me your home e-address and I'll get it on the way.
I have to compress all pictures before posting here on PFF


Joe
Fieroseverywhere JUN 25, 12:03 PM
Yea send me the full size pic. Can't quite tell what it is. The email tab right here...........^^^^ has the right address.

Is that a part of the caddy harness or fiero? Oh wait, blue rubber seal. I was looking at the other plug..... checking...

OK. I just confirmed. I'm not entirely sure which connector that is. I did not use it on my harness. This leaves a few options though...

AC
Cruise
Auto trans
Possibly the stock caddy CTS connector. (this needs to be switched for a 3 wire connector anyways)

If its part of the fiero harness then it could also be other options. I started with an 85GT with no AC, cruise, and had a V6 so it could be something to do with that. I'll keep checking and see what I can come up with. Hopefully someone else will be able to chime in also.

[This message has been edited by Fieroseverywhere (edited 06-25-2009).]

josef644 JUN 25, 02:06 PM
It was part of the Caddie harness but was not connected to the ECM plugs or was not connected to (spliced to) a sensor that was. There were two grounding eyes in the Caddie harness, this was one of the two. I'll send you a picture later today.

I have some chores do attend to before it gets 103* again. Heat index was 108 here yesterday.

Joe

[This message has been edited by josef644 (edited 06-25-2009).]