Engine Would a disconnected VSS and EGR effect engine function?

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Yes VSS is definite must for the anti stall strategy. It’s also used for cruise control.
The EGR is not a huge deal but will throw the tune slightly off under certain conditions. You can turn it off in a tune.
 
Thanks guys! If it makes any difference, I'll have an EGR block off plate on the TB.
Also, on the VSS according to my wiring diagram #679 is the feed from the ECU to the speed amplifier (which I assume is the cruise control) and #676 is the return line. There will be no speed amplifier on my project. Any way around this?
 
The wires are connected to the proper pins on the ECU. I just need to know what to do with the other ends of the wires being as I'll have no speed amplifier.
Can I just connect the feed and return wires together?
 
The ECU and speed control amplifier are wired separately

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no need to do a thing. If you want to verify you can check continuity from VSS wires to pin 3 and 6 on the ECU
 
The following are diagrams courtesy of Tmoss & Stang&2birds

Complete computer, actuator & sensor wiring diagram for 91-93 Mass Air Mustangs
91-93_5.0_EEC_Wiring_Diagram.gif



5.0 wiring diagram for Fuel Injectors, Sensors, and Actuators
fuel-alt-links-ign-ac.gif


See the following website for some help from Tmoss (diagram designer) & Stang&2Birds (website host) for help on 88-95 wiring; http://www.veryuseful.com/mustang/tech/engine/ Everyone should bookmark this site.[/b]

TFI module wiring for 94-95 Mustang GT
http://www.veryuseful.com/mustang/tech/engine/images/Mustang-94-95-IgnitionControlModule.gif

Complete computer, actuator & sensor wiring diagram for 94-95 Mustangs

Complete computer, actuator & sensor wiring diagram for 91-93 Mass Air Mustangs

Complete computer, actuator & sensor wiring diagram for 88-90 Mass Air Mustangs

5.0 wiring diagram for Fuel Injectors, Sensors, and Actuators

Main body EFI wiring harness

Ignition switch wiring

O2 sensor wiring harness

Vacuum diagram 89-93 Mustangs

HVAC vacuum diagram

TFI module differences & pin out

Fuse box layout

Mustang 5.0 Lights and Radio schematic, by TMoss:
http://www.veryuseful.com/mustang/tech/engine/images/mustangFoxLights-Radio_diag.gif

87-92 power window wiring

93 power window wiring

T5 Cutaway showing T5 internal parts

Visual comparison of the Ford Fuel Injectors, picture by TMoss:

Convertible top motor wiring http://www.veryuseful.com/mustang/tech/engine/images/mustang88VertTopMotorCkt.gif

Engine mounted fuel injector harness

Location of the TPS, IAB, and the 10-pin connectors on a 5.0, picture by TMoss:

Starter circuit

Alternator diagram for 94-95 Mustangs.