cartune777

just curious if the ors engine harness worth the price?, how many wire are in it, $700 seems kinda crazy for some wires

breknraj

Their harness made my project very nearly plug and play. It is a well made unit, and put together by hand, so that explains some of the cost. The other part is that all you have to do is give Mike the model and year of the recipient vehicle, and the model and year of the donor engine and ECU, and they'll take care of putting it together withe the right wires in the right places. Since every model year has slight variations in the wiring, there are a multitude of potential combinations, so every project is custom.

Yes, you can do it yourself, with the proper wiring diagrams to guide you, but I found the time savings in my conversion to make the cost worth while, to me.

RaginYota

Does the harness also come with the battery harness, or do you have to buy that one seperate?

cadman

The battery harness is separate. I used the 3.4 battery harness but did some modification to it.

The ORS harness was well worth it to me also and I give it a thumbs up.

AxleIke

I know several people who have 3.4 swapped.

Everyone who bought the harness said that it was WELL worth the money.

Everyone who did it themselves said they wished they had bought the harness.

cartune777

gotcha looks like ill more than likley be getting the harness, mine as well do it right. thanks for the input

Elvota

I for one am glad I did not buy the ORS harness. I think ORS does make a quality product and from everything I have read their support is fantastic. I was concerned figuring out the wiring myself as this was my first major automotive electrical project.

That said, the actual wiring is not that complicated. It is overwhelming at first. It takes some time to understand what signals all the pins are looking for on the 3.0 and 3.4 ECM. Once you understand that, you'll realize there are only about 10 wires that actually need to be connected from the 3.0 body to the 3.4 ECM.

Basically the 3.4 motor and harness work together already. No wiring mods needed. All one has to do is let the 3.4 ECM "talk" to the original vehicle. The ECM has to understand how fast the vehicle is going (1 wire), tell the tach the engine revs (1 wire), work with the AC (1 wire) and communicate with the fuel pump (maybe 2 wires). There are a few others I am forgetting at the moment. The rest of the pins are already connected to the 3.4 harness and require you to do nothing at all.

Mind you, mine was a manual swap. I think an auto swap would be more complex... but in my opinion not enough to justify the $700 from ORS. That cost will easily cover upgrades such as headers and intake, or simply reduce the overall price of the swap.

I have more details here:

https://www.yotatech.com/forums/f160...4-swap-128285/

Page 10 (Post 240) has the most wiring information.

cartune777

wow your wiring post looks easy enough, i am rethinking im not gonna get the ors harness, if i spent 700 on 10 wires id kick myself in the head. if it were 200 i might get it but 700 is just crazy. it would be nice if they would sell a guy the plans for the harness as needed, and have them wire it them selves, they would probably sell alot more of those

Elvota

With ORS, it is the planning and understanding of the EWD's you are paying for... not really the wiring itself.

I figured I'd give it a try myself first. If that failed, I'd call ORS and get a harness. Since Plan A worked I never had to spend the $700 on Plan B.

cartune777

yes i guess thats true, ill try it my self, if i cant get it ill get the harness

screamer76

i've got a little over 3k on my truck since the swap with no complications. the wiring was pretty intimidating until i got a little ways into it. then i realized that in my head, i had been making a mountain out of a molehill. i used more wires than elvota because of the 4wd and abs, etc., and it was still amazingly simple.

ors are great people. when i was having issues with my a/c, they were nice enough to check out my ewd's and from my description of the wiring that i had done, they were able to tell me that i had wired it correctly.

they also make great products, and i wouldn't hesitate to use anything they have to offer. i bought their ps high-pressure hose and have no complaints whatsoever. that said, financially, they just weren't an option for me when it came to the wiring.

what really gave me the confidence to do it was seeing elvota take this

and turn it into a running vehicle!

good luck!

Elvota

Thanks for the compliment.

It is true, if I started with a hacked wiring harness and still was able to figure it out... it can't be that hard.

fillsrunner4

Not me! Im glad I saved on not using it! ORS is a great company. but if you know wiring then there is no need to go with it

Simple some wiring diagrams
(one of many)

Turns the 3.0 into the 3.4

cartune777

so could someone possibly give me a run down of the wiring, like what connectors used ive searched most all the posts( evoltas and others) and its still kinda sketchy. ive got the two body harness conectors in the truck and the two body conectors on the 3.4 harness, do any need to do to the ecu

Elvota

You just need the EWD's for both the 3.0 and the 3.4.

Basically, you need to determine what info the 3.4 pins are looking for or sending out. 95% of the pins are already taken care of with the 3.4 plugs and harness. Beyond that, you just have to find a few 3.0 connections that the 3.4 ECU needs to communicate with.

Every swap is going to be a little different depending on the years of components involved. You just use a process of elimination once everything you need is in front of you.

Example:

"Hmmm.... I need the 3.4 ECM to tell the gauge what the oil pressure is. What 3.0 body harness wire goes to the gauge? And what pin from the 3.4 needs to connect to that wire?"

cartune777

IG2 from the '90 to the IG2 circuit wires from the 3.4 harness.
Engine coolant sensor from the 3.4 harness to the '90 wire from the temp gauge.
Oil pressure sender from the 3.4 harness to the '90 wire for the pressure gauge. (note, '90 pressure sender is used on the 3.4)
Indicator lamp pin from 3.4 ECM connected to the '90 gauge indicator lamp wire.
Stop light switch from the '90 to the 3.4 ECM stop light pin.
Speed sensor from the '90 gauge to the 3.4 ECM.
3.4 ECM circuit start relay pin to the circuit start relay on the '90.
3.4 EFI relay pin to the EFI relay on the '90.

ok so by going from what you wrote above here is that pretty much it?

Elvota

Pretty much... but that was for my swap.

Yours may be a little different but basically you should only have to worry about a few wires when all is said and done.

I did have dual 4CYL cases behind the 5SPD tranny when I did my swap plus a SAS... so I had nothing to work out in regards to the 4WD system.

I think people (myself included) imagine that they will have to address the connections of every pin on the 3.4 ECM and try and figure out what to change from the 3.0 setup. It's really not that complex once you have your hands on everything you need.

waskillywabbit

iTrader: (-1)

Not so sure that is a beaming testimonial since your 3.4 swap never ran right. j/k

Any company that does the effort to R&D something and then offer it to the public then deserves to be fairly compensated. ORS is top notch in what they do and if your sense of overwhelment is less driving than your bank account, get their wiring harness.

Personally, I will be doing it myself, but I will be starting from scratch (frame and axles) so there won't be any other wiring harness to deal with but the 3.4 one.

cartune777

yes ors is a very good company they have helped me out greatly and i havnt even bought anything from them yet, its just i have a set budget for everything on this swap, the 700 i would be spending on the harness is my rims and tires money, thats what im trying to decide. im fairly confident i can do the wiring my self. seeing how im not hooking up any gauges, ac or 4x4 stuff

fillsrunner4

It did run very well for me. Sensors and ECU issues were the issues with it not my wiring. I was sick of spending money of expensive sensors and misc stuff for it to keep it running