Speed Density

iTrader: (38)

I should have taken a picture but obviously I didnt

There is a 3/8" loom with the purple starter wire, knock sensor wire and TWO Black/white 18-20g wires. I think they are PCM grounds to the side of the block but Im not sure.

Anyone confirm this?

defaultexistence

iTrader: (11)

on my car one of those is a 02 wire

94Aquaformula

iTrader: (28)

one should be to the side of the block "for your battery" and one to the starter...the pcm ground is alittle guy that also goes to the side of the block

94Aquaformula

iTrader: (28)

yea if its a 93 it should be to your 02 sensor

Speed Density

iTrader: (38)

I already have the Oxygen wire tapped back, its not that.

Here is a shbox image:



You can see one is a ground to the block but whats the other?

94Aquaformula

iTrader: (28)

call me a retard but i don't see another wire

airfix

iTrader: (30)

Wierd, I only had 1 ground wire for the pcm to the block.

1badzee

iTrader: (12)

In some applications there are 2 wires (I know my 93 harness had two ground wires - they are one wire in the bulkhead connector but somehow split and turn into two). They are both grounds. I just cut them and ran a wire to the negative battery terminal.

Cam95Maro

iTrader: (1)

is there a reason you grounded out to your battery??

1badzee

iTrader: (12)

Actually, no specific reason. It is currently grounded on the chassis (by the power distribution block).

shbox

Of course you know 93s have to be different.

Yes, there are two wires that terminate on the block, above the starter. One comes straight from the ECM with no branches, the other goes to two different pins on the ECM as well as branching a ground feed to other places like:

oil level sensor
DLC
VATS module
transmission position switch (if auto)
fuel pump relay
instrument cluster

So, it's definitely something you want to keep hooked up.


Updated the pic on my site to indicate the different configuration for 93.

1badzee

iTrader: (12)

Heh, the step-child of the F-body's. Converted mine to a 94 OBD1 harness/pcm.. but still a 93 at heart. I <3 my car

Wicked94Z

iTrader: (26)

reading comprehension fail! lol look at the disclaimer about 93s in the photo

Wicked94Z

iTrader: (26)

hey man, I'd suggest just rewiring the whole car for the standalone. Unless you want/need the factory speedo. You can hardwire the factory coolant temp, oil pressure, and voltmeter stuff. I printed out a lot of schematics thanks to shbox

Speed Density

iTrader: (38)

See above, he just updated it ya rookie

I already have my XFI and fastrack harness wired up, I just found these wires torn to **** so I need to replace them.

Wicked94Z

iTrader: (26)

again

yea I've got my dfi stuff done, I redid some of the harness since it was used and needed some love for my setup. Now that I'm in wiring mode, I'm gonna go ahead and do a pushbutton start, and rewire the cluster to save me 550 bucks on full sweep gauges. I need to redo all my nitrous stuff and run it through the DFI... but that's going to take liquid motivation, like an 18 pack

shbox

I knew that would trip someone up that was late to the thread. I try not to miss a chance to update with good info. I had to look it up myself, to see why there were two wires.