View Full Version : Ignition system for 90 Nissan 240sx

09-07-2003, 07:12 PM
I'm going to install a MSD 6A Ignition Control into my 90 240sx. I also buy a Blaster 3 coil to install along with the MSD 6A... what else do I have to buy to have a better result from what I got... do I have to install a Tach Adapter and change my Distributor also?

09-08-2003, 11:53 AM
I would try it without the tach adapter, but if you experience a check engine light or tach problem then you will need the PN 8910 Adapter. Below is the diagram of your application, all you will be doing is swapping the factory coil with the MSD Coil.


09-08-2003, 04:56 PM
Thank you... I'll try to install it following your application

09-08-2003, 08:05 PM
Your welcome.

09-20-2003, 07:42 PM
I have a another question for you.... is your picture missing something.... Now I'm trying to install my 6A... But I don't know how to connect to the distributor wire.... because there is a green and a violet wire going out from th 6A... but the distributor wire has 4... that is green, black, red, and yellow...
How can I connect those 4 to my 6A inginition box?
I think the diagaram you give me was missing something

09-21-2003, 08:46 AM
I think this might be of help to you...

I have a 91 nissan 240sx and It took me around 30 minutes to install it all;
I don't know if you will need the Tach adaptor, but I did need it in my case, It's Part # 8910. If your Tach stop working when you put the MSD box in; then for sure you will need it. I will tell you how to hook it up...

Again:...This applied to my "91 240sx", I am not sure what's the differences between "90 and 91" years, you should find that out by yourself...but if you find the same wires, then it should be the same.
This is what I did in just less than 30 minutes:

The wires /terminals you need to cut will be found underneath the stock coil wrapped in heavy electrical tape.Take/cut the two wires that originally went to the coil make sure you leave some wire sticking out of the coil still, like an inch or so ( green/negative and black or sometimes red/positive ), connect the negative ( green ) to the white wire from the box, connect the positive ( red or black ) to the THIN red wire ( not the one for the 12v source ) from the box. Now you you're done with that side, now turn to the coil where you left some wire still sticking out ( I hope , hehe ). Take the orange wire from the box and connect it to the positive terminal ( the black or sometimes red wire, where you just cut to connect the red wire from the box ) of the coil. Take the thin black wire and connect it to the negative terminal ( the green wire, where you just cut to connect the white wire from the box ) of the coil.

The THICK red and blackwires are the 12v source. Just connect the thick red wire to the battery and the thick black to any good source of ground. Basically what you're doing is putting the box in between the wire you just cut going to the coil.

Now for the Tach adaptor, you need to to tap this on the original green and black (or sometimes red ) wires, the ones you cut to connect the thin red and white wire, remember?. You need to connect the adaptor wire at the white/green and red/black (or red) connectoin side before the box, not the wires from the box to the coil. It does'nt matter which wire goes to which from the adaptor.

Hope this may be of help to you if have not install it yet.


09-23-2003, 10:57 AM
The green and violet is not used in your application, so nothing is connected to the distributor only at the coil, just like tsurfer explained.