Where to get EEC-IV ECU specs/schematics.

[Lawrence S. Harris III]

> I am pretty sure I trust the mechanic.  I tested the EGO myself and was 
> getting ~0.53V from it.  I disconnected a vacuum line and got ~0.68V fro 
> the EGO.  On top of that, I have tried 4 different EGO's, 2 new ones, and 
> two junkyard ones, and still a code 41.  I have had this code 41 for 
> about a year now and have been trying to trace it for almost as long.

Since you are talking about EGO's in pairs, I assume the car is a 
Mustang.  These processors are very abundant, as kids tend to wrap 
Mustangs around telephone poles with great regularity.  You should be 
able to find a replacement for around $100.  If the car is a '88 or 
lower, you could probably find one for less than that.  If the car is a 
stock '89-93, you could use a pre '88 speed density computer if you 
switch the TAD & TAB lines to the speed density locations (I can look 
this up for you).  If the car is a MK-VII, the pre '88 Mustang computer 
should work (I can also verify pinouts for you for compatibility, but It 
seems that I remember that they are identical).  If you buy a new speed 
density computer, pay no more than $75 for it, as most people switch to 
mass air.

Larry Harris  lharris at crl.com  (770)682-8842 (voice)
'86 Mustang LX 5.0 Coupe (152K)  '82 BMW 635CSi Euro (122K)
Meyers Tow'd Dune Buggy (1776cc) '83 Toyota Tercel (186K)