Ozarks Jeep Thing Club

Public Forums => Technical Forum => Topic started by: ruffram on 07/ 6/13 - 12:27PM

Title: 91 YJ TBI swap help
Post by: ruffram on 07/ 6/13 - 12:27PM

I bought a 91 YJ some time ago and have been slowly working on wiring up a 350 TBI motor.  I bought the YJ without any wiring underneath the hood.  the bulkhead harness missing, and all wires and fuses/relays etc.  I purchased a YJ harness from ebay that i have connected now to a new optima red top.  I used alldatadiy to confirm the pins on the harness and the bulkhead match and are correct.  When I turn the key nothing is happening.  I have replaced the column mounted ignition switch and still nothing.  I check for power at the large red wire on the ignition switch plug and there is no power there and should be power there constantly.  All fuses are good under hood and under dash.  What is the next thing to check to see why I an not getting power at the ignition switch?   

Title: Re: 91 YJ TBI swap help
Post by: ruffram on 07/ 6/13 - 12:28PM

Thanks in advance for any help.  WIring is far from my favorite task

Title: Re: 91 YJ TBI swap help
Post by: gjgoodale on 07/16/13 - 04:42PM

Wish I knew how to help on this one.  A few people in the club have done this work so I'm sure they'll post up something soon.

Title: Re: 91 YJ TBI swap help
Post by: OJTV8CJ on 07/19/13 - 03:39PM

Did you figure this out?  I could go out and look at mine to see what you have going.  I have TBI in mine but don't remember checking the pin's to what is hot and what is not.

Title: Re: 91 YJ TBI swap help
Post by: 340YJ on 07/28/13 - 09:14PM

what year did the harness come from because in 92 they changed the wire harness

Title: Re: 91 YJ TBI swap help
Post by: ruffram on 07/31/13 - 12:21PM

Sorry I've been on vacation and haven't had a chance to write back.  I am not sure of the year of the harness but believe it to be From a 91.  The pinouts from alldatadiy.com were almost an exact match.  I went through an eBay harness at first from a newer Yj and it was completely different so i got this one locally. Any advice is appreciated. 

Title: Re: 91 YJ TBI swap help
Post by: 340YJ on 07/31/13 - 08:42PM

where are you located im in Spokane, mo.

Title: Re: 91 YJ TBI swap help
Post by: ruffram on 07/31/13 - 08:52PM

Southwest Springfield.  Near James river and Kansas expressway

Title: Re: 91 YJ TBI swap help
Post by: 340YJ on 07/31/13 - 09:08PM

have you hooked up diagnostic computer to check if you are getting
 cam and crank signal

Title: Re: 91 YJ TBI swap help
Post by: 340YJ on 07/31/13 - 09:09PM

do u have facebook

Title: Re: 91 YJ TBI swap help
Post by: ruffram on 07/31/13 - 09:25PM

I haven't hooked up diagnostics cause the engine wiring isn't hooked up to anything.  I don't have anything happening at the key.  No power at the ignition switch. It makes me wonder if I have a problem in the harness or something isn't right with the under dash fuses/wiring etc.   I don't have a Facebook account

Title: Re: 91 YJ TBI swap help
Post by: 340YJ on 07/31/13 - 09:28PM

DO YOU HAVE power at the PDC  https://www.facebook.com/

Title: Re: 91 YJ TBI swap help
Post by: ruffram on 07/31/13 - 09:32PM

I have power at the pdc and at the engine side of the firewall plug.  I don't have power at the hot side of the column mounted ignition switch but all fuses are good.  That's where I am puzzled

Title: Re: 91 YJ TBI swap help
Post by: 340YJ on 07/31/13 - 09:41PM

do you have wiring diagram from alldata pro

Title: Re: 91 YJ TBI swap help
Post by: 340YJ on 07/31/13 - 09:49PM

is it 4 or 6 cylinder harness

Title: Re: 91 YJ TBI swap help
Post by: 340YJ on 07/31/13 - 10:12PM

maybe we can have a jeep day and put heads together to figure it out 

Title: Re: 91 YJ TBI swap help
Post by: ruffram on 07/31/13 - 10:30PM

That would be awesome I will pm you my number. Thanks

Title: Re: 91 YJ TBI swap help
Post by: OJTV8CJ on 08/ 1/13 - 03:45PM

If you and Kurt have problems figuring it out let me know.  When you get it running and if you need it - I can hook a laptop thru the OBD port and see if you have any sensor problems or anything.

Sounds like you have it handled tho.

Title: Re: 91 YJ TBI swap help
Post by: ruffram on 08/ 1/13 - 04:18PM

Thanks.   I have to figure out how why I'm not getting power at the ignition switch first, and I'm not really sure why.

Title: Re: 91 YJ TBI swap help
Post by: 340YJ on 05/25/15 - 03:09PM

I just finished installing my TBI setup and are loving it