What is this in the 1971 240z ??

[Shawninvancouver]

Just rolled in  anew 71 240 and am looking it over..  what is the green circuit board on the firewall with some black cube plugs???? anyone seen that??  should i leave it out cut it out before trying to start the car?? it has not been started in 13 years.. also this weird 6 prong box on side of car,,, nothing going to it,, any clue on that???

Edited March 12, 2021 by Shawninvancouver

[SteveJ]

It's something a previous owner added. The pictures aren't that good of quality, but it looks like some plug-in relays and a terminal strip.

[Shawninvancouver]

better photo now....  do you think i can rip it out???  it goes from engine firewall to under the passenger foot rest,, a big plug..

[SteveJ]

I looked at the other thread. It's not stock. It's a MegaSquirt relay board for fuel injection.

https://www.diyautotune.com/product/megasquirt-relay-board-assembled-unit/

[SteveJ]

I will add that the relay board certainly has seen better days. It should have been mounted inside the passenger compartment. The person who installed it chose a very poor location for mounting.

[Shawninvancouver]

Ok  can i cut it out???  will car start without that??   where else does it go to - to make  a fuel injection work? i want to go back to normal??

[SteveJ]

Sure you can cut it out. It's your car.

Will the car start without that? Did the car run when you bought it? We can't tell from the photos you posted what you have under the hood.

Where else does it go to? It goes to the MS ECU, the fuel injectors, and the electric fuel pump. Do you have all of those components?

If you want to go back to stock, I suggest you go to the downloads section on this website and download the factory service manual for the 71. Then start by reading through the EF section to familiarize yourself with the components you are missing.

[Shawninvancouver]

no fuel injection  no electric fuel pump... no clue why its there,,,,

 

here is engine,,  see anything intersting????

[Zed Head]

How did you get two threads posted with the same title?  How did you get two threads posted with the same title?  How did you get two threads posted with the same title?  How did you get two threads posted with the same title?  How did you get two threads posted with the same title?  How did you get two threads posted with the same title?

[Zed Head]

I was kidding.  

Looks like somebody already converted back to carbs.

p.s. that engine bay is hideous.

Edited March 12, 2021 by Zed Head

[Racer X]

7 hours ago, Shawninvancouver said:

no fuel injection  no electric fuel pump... no clue why its there,,,,

 

here is engine,,  see anything intersting????

It looks like you will need to do a lot of work before trying to start that up.

From here it is impossible to tell the condition of the wiring, fuel system, cooling system, etc. 

As for removing the Megasquirt harness and circuit board, I wouldn’t start chopping and ripping. A more deliberate approach is needed. Like a surgeon removing a tumor from a patient. Take the time to see where it is connected to the original harness, remove any unnecessary bits neatly, so you don’t compromise the integrity (well, what’s left of it anyway) of the original wiring.

 

[grannyknot]

You have a real mishmash of two systems going on there, it looks like at one time there was a fuel injected engine in that car being run by a MS but from your pics it looks like the MS has been disconnected and the stock ignition coil has been reconnected.  You can probably assume that the car was running on the  original harness before the car was parked/ abandoned but if the stock wiring harness is in the same condition as the rest of the engine bay you should probably put your effort into cleaning all the connectors and terminals first and making sure you have continuity. 

Does the engine turn over by hand, make sure it is not seized.  Before you even turn the key you will also have to go through the fuel system top to bottom and clean out any rust and muck that has accumulated.  That's a big project, as SteveJ  suggests, download the FSM and get your multimeter out.