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Topic Review (Newest First)
03-12-2004 10:32 AM
rally4x4racer Junk yard is the only place I know of and I know its no fun tracking it down or paying theyre rediculous prices anymore. you cant even pull your own dadgum part in some places.

you may be able to find some s10 enthusiasts out there with shops or parts too.

keep in mind other harnesses may work, you just have to research it. by ecm number on differnt vehicles, by accessories or part number at the dealer... there are a few ways your could do it. obviously the vehicles would all have a 2.8.

the most likely victim will be a cavelier or one of chevys cars - or something of like size.

good luck man I know its a paoin in the butt!

03-11-2004 06:26 PM

Here is my dilema,
I bought this truck very cheap. $400.00. The body is near perfect. It is an extended cab, short bed with A/C. At the very least I figure it would make a nice 350 conversion project. It is an 86 model. The original motor was tired. The fellow before me finds an 93 s-10 with a 2.8 v6 in it that has been rolled. The motor runs like brand new. Only 35000 miles. He pays a buddy to swap the 93 motor into the 86. They leave the original harness in the 93 and it goes off to a junk yard. When they removed the ecm from the 93, they just cut the wires about six inches from the ecm and put the ecm in a box of other parts that came with the truck. After I buy the truck i find out the motor has been switched. The seller tells me it ran fine when in the 93, but after installing it in the 86 it won't run at all. Cranks over, catches and then shuts down. Now I am thinking instead of a project truck, i should trouble shoot this vehicle and run it for a bit just to feel out the suspension and do some body tweaking and gear up for the 350 swap, drop kit, etc. So, I go to a couple junk yards looking for the harness and find out that not too many s10's had the 2.8 engine in them. I have the original ecm to this engine, but need the correct year harness. I really think I should try this before moving on and changning things and getting confused. Where can I find an 93 ecm harness for 2 wheel drive, 2.8, a/c, auto. truck?

03-09-2004 06:39 PM
rally4x4racer alldata is cool...

it should work
always go newer ecu vs. newer harness
as they do alot of software and harware config updates on a random basis.
I am thinking I bought a performance pcm for my 95 dodge
and whoever programmed it did not update the prom.

when I said just chop some g wires and make it work.... I guess Im stuck in the 80s too... and I was thinking about older stuff which is still an easy out option if you ask me.

If you already got the block in, I would cross reference the year make block with the year make harness/ecm and see how many years and vehicles they used that harness/ecm on and what the difference is between it and the previous version - and the latter. it may also be possible to use even newer parts, you never know with these lazy manafacturers. newer harness and ecm may give you more upgrading options if your looking for speed.

I dont know much about the chevy's except I love 'em. but for instance - on my dodge they used the same harness I have from 94 to 96 or so for most dodge rams dakotas and jeep wagons. you will wind up with unused connectors but its way less expensive to make.

by switches I was referring to 4 wd electric lock outs, OD bypass, hi beams and all the like. the harness has to have all the same circuits to work.

yes you can cross-ref by part number thats probably the best waY. It will be alot of research, but its possible.

Is your truck 4wd? considered forced induction?

you know if it turns out to be a hassle you can always put the 2.8 on a skateboard!

03-08-2004 08:28 PM
NorthStar Well I had a 88 s10 with a 2.8 it was a TBI type fuel system so thats what I figure you have too.

If you dont have any experience with fuel injection youll have a lot less trouble putting it back to stock configuration, at least then you can follow the wiring diagram.
If your trying to convert over to central sequential injection I think your going to get in over your head because now your going to be following two wiring diagrams and melding them together. Plus most of the sensors and such dont have the same type connectors.

You can get a good wiring diagram here.
03-08-2004 04:36 PM
BK455 I would have to think they would try to keep the harness the same for a couple of years in a row. Someone out here has to know the answer to this. My mind is stuck back in the seventies. All this computer stuff is new to me, with the cars. I wonder if there is a cross reference site somewhere, or if it can be found by part no. as being the same? Anyone?

Dennis in R.I.
03-08-2004 04:22 PM
87442lover I would say the 92 harness would work wine as long as it was from the same model car with a 2.8L engine and the correct type of fuel injection. But maybe someone else here will know, cause my brain is still stuck in the 80's sometimes with cars.
03-08-2004 03:59 PM
BK455 I don't think that a 2.8 will fly, but when i got this truck it had just had a 93 2.8 installed in it with only 35000 miles on it. I don't want to pull it out, just want to know if it is going to be a hassle to get the right harness and make it work. Will a 92 harness work on a 93 ecm? Does anyone have this info? Or should I just go to a junk yard and find a 93 set up the same as mine. This truck has a good body with nice paint, great interior, a/c. It is worth the little bit of money i put out for it and just want to make this engine work and use it. Maybe down the road i will do a 350 conversion, but not now. Any help on this is appreciated.

Dennis in R.I.
03-08-2004 03:52 PM
87442lover Your not going to make a 2.8L fly, sorry just not possible for a cheap price. I would go for the 4.3L V6. Also you will need the harness and computer for installing a TPI/EFI engine. Just swapping the computer will not work unless you redo a new harness.
03-08-2004 03:48 PM
BK455 Ok,
I found out that the harness was discarded for the 93 2.8 v6 that is now in the truck. I have the original ecu that I can install in the truck, and the plugs that plug into the ecu with all pigtails hanging out of them that they cut to remove the ecu. Now, I found a blazer with 2.8 but it is a 92. I really would like to make this thing fly. You mention switches and etc. and I don't quite understand what switches and how that affects anything, but am probably in for a lesson. Does anyone know if the 92 harness is the same as 93 on all 2.8 vehicles? Or should i go to a junk yard and look for a harness of a 93 s10?, and does it matter if it is an automatic or standard?

Thanx again,
Dennis in R.I.
03-08-2004 07:52 AM
rally4x4racer HEY DENNIS!

there are more alternatives than you think!! he is right, the swap had to include the wiring and ecu from the newer vehicle. but then you get into switches and all that crap.

I think you would be better rippin the ecm out and doing a little wiring yourself. plug up most of the junk sensors.

since it is fuel injected you could make your life easier by getting an aftermarket f.a.s.t. system or similar.

If your better with older cars (like most of us) I think this would be a fun way to go. I am considering it on a dodge ram

03-07-2004 09:28 PM
NorthStar If it was me I would start by checking for spark and fuel pressure. Could be all sorts of things wrong. Need to be more clear on what system youre working on before anybody can diagnose it over the internet.
03-07-2004 08:52 PM

Thank you very much, that is what I was hoping to hear. Now if that is the only problem I will be off and running.

Thanx again,
Dennis in R.I.
03-07-2004 08:46 PM
badknuckles the computer and harness should have been swapped out i would say that is your problem.
a 93 which is central injected wont run with a 86 cpu which is either tbi or carb.
03-07-2004 08:40 PM

I just picked up an 87 s10 and the person i bought it from pulled the original engine out that had bad knock. v6, and replaced it with a 93 v6 same size engine. It will not start, it catches but will not keep running. Acts like it is flooding, or maybe as it catches it decides not to run. I know there is a chip, or chips in the comp. that are referred to as "prom"? The comp. was never swapped out. Or I guess the computer is referred to as ecm. Please correct me if I am wrong about any of this info. If the ecm was not swapped out, would this cause the engine to do what it is doing? As you can see, these newer vehicles are out of my reach, so any help is well appreciated.

Dennis in R.I.

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