how to remove, save and rewiring 4G63 engine harness

Bill Hincher · Post by **Bill Hincher** » Fri May 04, 2007 10:08 pm

While I been waiting for my bellhousings, I been stripping out some cars, I thought maybe some of the new guys would like to see how to get what they needed out of the car so they could hold the cost down

carguyf545 · Post by **carguyf545** » Sat May 05, 2007 1:10 pm

great job bill, this should be added to the site

89coltgt · Post by **89coltgt** » Sat May 05, 2007 5:20 pm

I have done this before in the past, would have probably been a little easier with something like this to look back on

jeffball610 · Post by **jeffball610** » Sat May 05, 2007 6:50 pm

Now that the car is stripped down, turn it into a 12 sec. car with nothing but the 14b, intake, exhaust and some fuel tuning.

dsmpilot · Post by **dsmpilot** » Sat Jun 30, 2007 7:01 pm

1/2 hour?! Took me 2 hours to get the wiring from headlights to rear seats! But i'm going to use the dsm gauge cluster. Figured it's still newer wire than the 34 year old stuff in the celica.

Bill Hincher · Post by **Bill Hincher** » Sat Jun 30, 2007 10:37 pm

hi Dad

peregrine · Post by **peregrine** » Mon Jul 02, 2007 9:30 pm

you still da man bill

4g63mightymax · Post by **4g63mightymax** » Thu Jul 05, 2007 2:11 pm

smog wrote: I do admit, I took a few prybars and bfh to the dash to cut time down drastically.

-Jeremy

Mitsu-San · Post by **Mitsu-San** » Tue Jul 10, 2007 10:02 pm

how do you incorporate the main relay if it isn't part of the engine harness? I'm gonna be installing a 4G63 into my 280Z and this is my first major engine swap. The install wont be that difficult..just the wiring is my headache.

Bill Hincher · Post by **Bill Hincher** » Tue Jul 10, 2007 11:08 pm

well, first thing, take a deep breath and sit back, now repeat after me, wiring is NOT a problem! once you get rid of that frame of mind, you are half way there

the C-54 connector is the one with the blue collar, its the most important connector, the main relay drives the fuel pump, it has a black with red stripe wire,30amp feed from the small fuse box next the the battery on the original set up.
the engineers did not want the fuel pump to run if the engine was not running, so they wired the main relay to work when the key was in ' start' position ( for 15seconds) or when the airflow meter told the ecu the engine was running, that is all pre engineered in the system.

The main relay is bolted right next to the ECU under the dash and it IS part of the engine wire harness.
when I get ahead a little bit, I will add a schematice for you

Mitsu-San · Post by **Mitsu-San** » Tue Jul 10, 2007 11:20 pm

I spoke to you this past weekend about the W58 bellhousing. I was thinking of going with MS but how everyone knows about project budgets start growing and growing. I'm just gonna stick with the stock electronics.
Henry

75COLT · Post by **75COLT** » Sat Apr 05, 2008 11:33 am

all you need is the harness that connects to that ecu you have. a small portion of the harness passes through the firewall or bulkhead to attach the ecu. it's shows in the pictures up in the previous posts by our beloved Mr. Bill.

Ian

75COLT · Post by **75COLT** » Sun Apr 06, 2008 9:41 pm

I haven't started putting the motor even in my car yet. the harness I have was already in a colt with 4g63, from Pergrine's 73' colt. it was stripped to the essentials. Go thru the electrical posts from some other builds going on here. Or you can ask specific questions about connectors and where they go.

Ian

Bill Hincher · Post by **Bill Hincher** » Sun Apr 06, 2008 10:21 pm

look here
http://www.projectzerog.com/wiring-how_to.shtml

Post by **DJpowerHaus** » Mon Apr 07, 2008 9:33 am

I'm doing a harness before my trip and I'll try to update that wiring section before I go. Now is the time to ask wiring questions and make photo requests!

Prevolution · Post by **Prevolution** » Sat Apr 12, 2008 10:27 pm

What a great and informative thread - thanks Bill !

I'm not sure what the best way (most economical) is to go :

1.) Buy a running donor car

or

2.) Buy a 4G63T by itself

Does anyone make / sell a harness ? I just need the bare essentials, as emmision control devices is not of concern and all my guages autometer.

Bigmack · Post by **Bigmack** » Wed Dec 24, 2008 10:38 am

this makes my swap so much better..thanks

Matt Arruda · Post by **Matt Arruda** » Wed Dec 24, 2008 11:37 am

somone sticky this thread BIG THUMBS UP for Bill this info is worth countless hours and time is money.

straightarrow · Post by **straightarrow** » Sat Feb 14, 2009 7:50 pm

Just about to start my Arrow/4G63 swap next weekend. That took a load off my shoulders. Thanx alot.

boise-nic · Post by **boise-nic** » Mon Feb 16, 2009 8:53 pm

So I've isolated the harness that goes from the ECU through the firewall to the engine bay. I took off the rubber boot and the hole is very small with little room to snake the harness through. How did you get the complete harness out without cutting it? Did you push everything through to the engine side or take the engine side through the firwall to the cabin. Mine is a 90 dsm so they are a little different but I just don't see how it's possible unless I take some tin snips to the fire wall and enlarge the hole.

Post by **DJpowerHaus** » Wed Feb 18, 2009 2:30 pm

If the factory installed them through those holes, you can remove them through those holes. Sometimes you need to push the connector through sideways, but they'll always fit.

sidewayz69 · Post by **sidewayz69** » Sat Aug 08, 2009 11:01 pm

thanks bill.........if i had seen that post ah sooner i would have saved some money on the electrical that i did.......... and 2 ppl did it eh but something is wrong still............... its ah non turbo 63 i dunno if its the 1g or 2g engine
anyhow......... the engine was started WITHOUT THE AIR FLOW SENSOR
and it was revving and idling very nice
then we soldered all the wires and connected relays 4 the fan and pump and the car is not revving now!
its just giving flat spots..........tomorrow i will try 2 wire in ah 4g93 air flow and see if that makes ah difference cause i cannot get the 4g63 air flow......
will it work?

http://www.extremeevolutions.com/CASwiring.gif
that is when it started....

Bill Hincher · Post by **Bill Hincher** » Sat Aug 08, 2009 11:53 pm

the engine runs perfect below 2500 RPM before it needs the air flow meter
when you rev it up, it should reach 2500 RPM and fall on its face

sidewayz69 · Post by **sidewayz69** » Sun Aug 09, 2009 7:47 pm

thats the problem............
i cannot get 1 and i dont no what it looks like or even have the jack for the air flow sensor......
so basicially i dont no what i am looking 4( how it looks and the wire colour codes)

http://www.youtube.com/watch?v=FjDP0qfb09c
i dunno what happened last time but this is when it started

Bill Hincher · Post by **Bill Hincher** » Sat Sep 18, 2010 3:08 am

bump for cordell

sidewayz69 · Post by **sidewayz69** » Wed Nov 17, 2010 10:25 am

soo i got the car 2 work properly.........
when i bought the engine..
i did not take out or adjust anything so that i will not fall in to any problems but guess what?...
the cam sensor was in the incorrect position all this time....ahhhhhhh
a friend of mine found out this....
so there i was... loaded the car an when i came off of the clutch...
the car went sidewayz........

wow!!!!!
now i am waiting 2 see how the turbo version will be..
or an can some1 show me how 2 post up pics...
thankz again ppl...
will keep u all up 2 date

econodream · Post by **econodream** » Wed Feb 20, 2013 8:45 pm

I know this is super old but bill if you see this is the dsm harness a 90? or 91-94 cause there are slight differences in the harnesses from 90 and on? Im in the search now for a harness and this is great info.

Also would auto or stick matter if im installing in a auto setup? or is that more the chassis harnesses job?

Bill Hincher · Post by **Bill Hincher** » Thu Feb 21, 2013 9:29 am

the CAS was different on the second gen ( I think) there is a shop manual dedicated to the Mits wiring system through the dealer for about $30.00

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how to remove, save and rewiring 4G63 engine harness

how to remove, save and rewiring 4G63 engine harness

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