Help with scanner codes

[subcreep]

I ran the KOEO (key on engine off) test and got no hard faults, but I did get a 31 (EGR Valve position sensor) error from memory.

For the KOEN (key on engine on) test I got a 44 (problems in thermactor air system) and a 94 (Thermactor air system problem in right bank)

Are these codes related, if not what should I do to troubleshoot? My check engine light only flashes when the outside air temp is below 55 degrees. The car runs really rich, I smell gas constantly even when idling and I get terrible gas mileage. I've checked for fuel leaks (there are none), and the EGR valve vacuum is good.


'92 vert LX - BBK cold-air, o/r x-pipes, 3 chamber flows

 

[subcreep]

Just to add to this problem, there were no hard faults during either test. So what the hell is the thermactor air system? It looks like the vacuum system???????

 

[jrichker]

Codes 94 & 44 - Check vacuum lines for leaks, & cracks. Disconnect the big hose from smog pump: with the engine running you should feel air output. Reconnect the smog pump hose & apply vacuum to the first vacuum controlled valve: Its purpose is to either dump the pump's output to the atmosphere or pass it to the next valve. The next vacuum controlled valve directs the air to either the cylinder heads when the engine is cold or to the catalytic converter when the engine is warm. Disconnect the big hoses from the back side of the vacuum controlled valve and start the engine. Apply vacuum to the valve and see if the airflow changes from one hose to the next.
The two electrical controlled vacuum valves mounted on the rear of the passenger side wheelwell turn the vacuum on & off under computer control. Check to see that both valves have +12 volts on the red wire. Then ground the white/red wire and the first solenoid should open and pass vacuum. Do the same thing to the light green/black wire on the second solenoid and it should open and pass vacuum.

Remember that the computer does not source any power, but provides the ground necessary to complete the circuit. That means one side of the circuit will always be hot, and the other side will go to ground or below 1 volt as the computer switches on that circuit.

See the following website for some help from Tmoss (diagram designer) & Stang&2Birds (website host)

http://www.veryuseful.com/mustang/tech/engine/images/fuel-alt-links-ign-ac.gif

http://www.veryuseful.com/mustang/tech/engine/images/88-91eecPinout.gif