7mge to 7mgte wiring harness - Toyota Nation Forum : Toyota Car and Truck Forums

pracefan · 10-26-2008, 11:01 PM

I just bought a 87 MKIII ge car with a blown engine and a import 7mgte on the side. The guy I bought it from claims he researched the wiring harness issue and was told the ge harness will work fine with the gte. Is this the case? I know I need the ECU, IC with plumbing, etc. I bought this to install in my 84 MKII.

CRE · 10-27-2008, 01:39 PM

A GE engine harness on a GTE? Uh... NO.

There are a number of differences in the electronics between the two engines.

pracefan · 10-27-2008, 02:22 PM

What is my best option at this point. The 7mgte is good, and I think I still got a decent price for everything. Is there no possibility of that harness working?

Jeeves · 10-27-2008, 03:45 PM

CRE has worked on numerous NA and GTE engines and is probably best to outline the diferences, but I can tell you right now that the Ignition, Airflow, Timing sensor and knock sensors (one versus two) are all different. I myself only have a textbook knowledge of the NA's so, forgive me if my information is wrong.

CRE · 10-27-2008, 06:49 PM

I'm not a pro or anything... people just seem to find me when they need help around here. I really need to start charging, maybe then i'd get somewhere with my own car.

Jeeves, there are some more differences but really, with all that you've listed I should hope pracefan has enough of a picture to know better than to even bother. I wouldn't try adapting them unless I absolutely had to. I'd sooner buy a completely trashed GTE harness and rebuild it.

I'm not going to put a lot of thought in it, but in the GTE FC is wired differently. The igniter's wiring is different as well. GTE's also have two additional sensors in the T-stat housing. There's the HAC sensor too... N/A's don't have it.

Pracefan, buy a used harness from someone and patch it up if needed. Make sure to get the matching ECU. If the harness is from a '87 or a '88 get an '87 or '88 ECU. If the harness is from a '89 or later model get an ECU for a '89 or later. You'll save yourself a lot more headache this way.

Find out if you're missing any other electronics too. You'll need the CPS and coil packs (probably still mounted to the engine). You'll need the igniter, possibly the resistor pack for the injectors (The one from the N/A should plug right in though. It's on the driver's side fender.). You'll need a KVAFM (see: karman vortex air flow meter). You'll need the HAC too.

Jeeves, I can't recall right now, isn't the stock boost gauge sender wired through the body harness?

On a side note, the "timing sensor" aka CPS is the same. The N/A's is just nested inside the distributor (and yes, there's more to the distributor), but they both send out the same signals. You can use a GE distributor as a CPS in a GTE (but not the other way around).... you know, if someone forced you to.

Jeeves · 10-27-2008, 08:23 PM

The boost sensor is wired through the body harness, you don't have to pull it when pulling the engine harness.

CRE · 10-27-2008, 08:30 PM

Thought so.. the reason I mentioned it is that pracefan's either going to need to run his own wiring for the stocker or get an aftermarket gauge. I'm pretty sure the wiring isn't present on the N/A's body harness... unless it's taped up behind the dash somewhere (which wouldn't surprise me). <---- see don't have all the answers

pracefan · 10-27-2008, 08:58 PM

Thanks for the information, glad I joined this forum. I know of a wrecked 87 that I hope I can get most of what you list and hopefully more.

I have 3 MKIIs. 82,83, and 84. I have used the 82 and 83 to get the 84 running with a 6m import. They have all sat since 95, just haven't had time to work on them, but now that I have the 84 running, this is going to cut into my fishing time really bad.

I hope I can tap more information from this forum.

What about suspension and drivetrain? Should I try to use the 87 5speed and clutch? The tranny is rebuilt and the clutch shows no wear. I have read somewhere to stick with the MK2 5speed. Is the differential a possible swap?

Is there anything in the suspension, brakes/rotors etc that will swap?

pracefan · 10-27-2008, 09:00 PM

CRE, I'm in Pueblo, further into this project, since your in Denver, I might be willing to pay you to come down and help.

CRE · 10-27-2008, 09:21 PM

Hey, don't worry about getting more help from this forum. I'll PM you Jeeves' email address and phone number. He's up all hours so don't hesitate to cal him for even the most trivial thing... or even for a chat.

Sorry, i missed that this was all going into a MKII. If you're not planning on putting more than 350HP to the rear wheels the W58 would be my choice. It's lighter and shifts a bit more smoothly. If this is a car you're going to beat the crap out of every chance you get then I'd consider swapping in the R154 from a GTE.

I don't recall if the diff from one of these will bolt right in there or not. What size is the diff in the MKII?

Since you're installing this all into a MKII I'd recommend you just grab every piece of electronics you can from the engine bay whatever MKIII's you find along the way. Always easier for me to sort through what I don't need than to actually sit patiently and wait for the mail man with the ones I didn't think I'd need.

If I can afford the gas and my car's running, I may be game to head down that way some time. I'm sure it'll be a bit before you're ready for any help though. But feel free to keep me posted. So... the MKIII that's playing donor... what kind of shape are the shell and interior in?

BTW, who'd you buy that car from? You can just PM me... just wondering if it's someone I know from down there who was having very little fun with his MKIII.

pracefan · 10-27-2008, 09:33 PM

I bought it from a guy in the Calhan area, Bobby Stickler. He bought the ge in the Denver area.

The ge I bought has an excellent interior and decent shell, no rust or major dings. The other car (gte) has decent seats, blue, and some decent interior parts.

***bgrieger*** · 10-27-2008, 09:35 PM

The R154 also requires a little sledge hammer persuasion of the trans tunnel to fit the MKII as a couple of MKII owners have noted to me.

CRE · 10-27-2008, 09:44 PM

I may want to talk to you some time about possibly taking some of those parts or maybe even a shell off your hands if you're interested later on. Not trying to be presumptuous or anything.

The only interior stuff I'm looking for are two flawless door panels and the rear carpet in blue.

But I've been fighting with myself for years now about whether I want to just fork out a tone to have my current shell repaired (looks like the prev owner drove it under a truck on the driver's side corner) or just buy a good one to have resprayed and just swap everything over. Looks like my heater core may have a pin hole, so I'm leaning toward a new shell if I can find a nice one.

Anyway, nope, that's not the person I had in mind... heh, if it were I could've told you exactly how he killed the engine... damned kids.

Do yourself a favor (if you haven't already planned on it) and pull the GTE apart and make sure it's square. I've seen a couple real pretty JDM paperweights in the past and these engines eat head gaskets.

CRE · 10-27-2008, 09:47 PM

Quote:

Originally Posted by bgrieger

The R154 also requires a little sledge hammer persuasion of the trans tunnel to fit the MKII as a couple of MKII owners have noted to me.

I thought it might. Any idea about the diff? Rob over at 935motorsports might know. I think he's swapped one in before.

***bgrieger*** · 10-28-2008, 07:47 AM

I know they have a couple of swap options for the guts of them, but I had not yet heard of any full pumpkin's being done (not to say it hasn't...I'm not exactly up to speed on the mod side of the MKII). If there is enough space between the trailing arm mounting points, I'm sure it's not all that hard to fab one in there, but I'm only speculating.