[Gmecm] 181 merc efi harness

[David Allen]

It's super-easy to add in the ALDL port.  Only 2 wires are necessary for the 
computer to communicate.  The serial-data and the ground.  All the other 
"fluff" is for factory diagnostics of the remainder of the vehicle.

Just pull out as much length of the ALDL as possible and cut it off.

The fuel pump wiring is routed differently on all the cars. It is a very 
simple circuit so I always just build my own.  You DO NOT NEED the oil 
pressure switch in the fuel pump circuit. I can explain why it is there if 
you care but let it suffice to say you don't need it. The fuel pump circuit 
needs these things: Pump, Relay, Fuse, signal from ECM.  Nothing more, 
nothing less.

I'm with you 100% on the junkyard stuff.  GM's controllers are nearly 
bulletproof and available everywhere.  Plus there is the stealth factor 
because it is all factory parts.

Sincerely,
David
----- Original Message ----- 
From: alan mays
To: Gmecm at diy-efi.org
Sent: Thursday, August 25, 2011 2:28 PM
Subject: [Gmecm] 181 merc efi harness


  Thanks for the input,

 On the GM board there seem to be factions just like the bigger efi/diy- 
when I first signed up there were guys trying to lure me to the Megasquirt 
crowd, but im a junk yard dawg---some are more inclined to use the 730 
rather Than the 749------Its plain to see why.  i have another lead on a 
turbo bird,  The aldl ports on these are not part of the engine/efi 
harness ---Instead they are part of the dash wiring harness,  how do ya'll 
deal with that-- hours of fun pulling all of it--or is there an easier way 
to add just that part in??

 I know the vss is also part of the dash harness on some but remember an 
attermarket in line add on vss from a speedometer supplier that could be 
used.

 As far as the rear part of the car --the fuel pump in tank is the only rear 
lead to worry about--what section of the harness does that tie  into?

 TFtI




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