72 Stang to EFI conversion

[Carl Summers]

Scott Shotton wrote:
> 
> Tim Raymond wrote:
> >
> > >Oh Yeah!!  You'll need the oxygen sensor in the exhaust.  Very important
> > >to closed loop operation and saving your pocket book from melting down
> > >catalytic converters.
> > >
> > >The power steering pressure switch could be eliminated, but you might
> > >want this with power steering.
> > >
> > >E-mail me if you have any specific questions
> > >
> > >Scott
> > I have a couple of questions. Do I need the cats or can I ditch those. I
> > have no emmisions tests to pass and as far as I know NY has no emmissions
> > requirements for earlier cars. I'm planning on removing thermactor air. I
> > think I'll keep the EGR. It wont hurt, but I don't think I have the vacumn
> > regulator or solenoid or whatever it is. I can't find very clear info on the
> > manuals I have. Where is the BAP mounted, I may or may not have that. I am
> > also missing O2 sensors. I assume any junkyard O2 sensors will work. I'm not
> > quite sure what to do about exhaust. Currently the car is stock '72 single
> > exhaust. The '90 has headers. Third and final big problem is fuel delivery.
> > Probably an inline pump, but I'll have to add a return line. I presently
> > have the engine mostly disassembled so any mods here are easy. As soon as it
> > warms up around here I can get to the car and find out more. Well, thanks
> > for any help. It is going to be badly needed
> 
> The O2 sensor:  don't get a used one.  New ones should be less than
> $100.  You can buy aftermarket adapters to weld onto the headers to
> mount the sensor.
> 
> The fuel pump on the 90 is a high pressure in tank.  That swap would not
> be practical.  See if you can find an in-line pump in the aftermarket.
> The fuel system operates at aprox. 40 psi.  The fuel pump should
> probably be able to deliver 60-80psi or more.  I had one Ford with a bad
> pressure regulator peg my gage at 100psi.  Yes, you will need a return
> line.  The setup at the fuel rail should already be there.  Depending on
> the fuel line already in the car, you may need to use high pressure fuel
> line for the feed side.  Normal rubber fuel hose doesn't hold up to
> 40psi+ very well.
> 
> OK...  Now I have a diagram in front of me.
> 
> The components you definately need:
> O2 sensors (my diagram for a 90 shows 2, one in each manifold/header)
> ECT, TPS, ACT
> MAP/BARO & MAF (my diagram shows both)
> Idle air bypass solenoid
> EEC power relay
> Fuel pump relay
> 
> The components you may need:
> EGR valve
> EGR Vacuum regulator
> Clutch/Neutral switch
> 
> Optional components:
> Canister Purge components.
> AC wide open throttle relay
> Power steering pressure switch
> 
> NOTE!!!!  There is a 22K ohm resistor in line on the IDM circuit.
> Between the TFI IV ignition module and pin 4 of the PCM.
> 
> If you want a copy of the wiring diagrams, or If you want to know what
> year engine managmeny system will be easier (and work) with a 72/90...
> Let me know.
> 
> I might even be able to get you a deal on quality aftermarket parts (ie.
> sensors) if you needed a handful of new ones.
> 
> Let me know.
> 
> Scott

Regarding the 02 sensor bung,,,it is an 18mm spark plug thread,,,,You
can use a nut(just make sure it is short enough) or I have used a spark
plug non-fouler and cut it to length,then weld on and chase
threads,,,,hope this helps...
-Carl Summers