Help, car is stalling on a code 81 !!!

Code 81 Secondary -Air Injection Diverter (AIRD) solenoid circuit failure.

Thats part of your thermacor air injection system. It would not cause your running problems. I get the same code because I deleted my whole air injection system, and I dont have running problems because of it. I would think your problem has something to do with your fan wiring.

The code 81 isn't your problem.

Code 81 – Secondary Air Injection Diverter Solenoid failure AM2. The solenoid valve located on the back side of the passenger side wheel well is not functional. Possible bad wiring, bad connections, missing or defective solenoid valve. Check the solenoid valve for +12 volts at the Red wire and look for the Lt Green/Black wire to switch from +12 volts to 1 volt or less. The computer controls the valve by providing a ground path on the LT Green/Black wire for the solenoid valve.

See http://www.veryuseful.com/mustang/tech/engine/images/88Stang5.0Vacuum.gif for help on the vacuum line plumbing.

Remove the large rubber hoses from the rear of the aft vacuum control valve. One hose goes to the pipe to the back of the heads. The other hose goes to the pipe that goes to the cat converters. Start the engine and apply vacuum (steal a line from the manifold somewhere) the airflow out of the valve should switch from one outlet to the other. If it doesn't then the vacuum control valve is bad.

With the engine running, stick a safety pin in the LT Green/Black wire for the solenoid valve & ground it. That should turn the solenoid on and cause air to flow out the port that goes to the pipe connected to the cats. If it doesn't, the valve is bad. If it does cause the airflow to switch, the computer or wiring going to the computer is not signaling the solenoid valve to open.

I'd consider changing the fuel filter if you think any of the crap in the bottom of the tank got sucked through the system.
Remember that fuel is the lubricant for pumps too (running low or out of gas can shorten their lives - something to recall if an issue crops up in the future).

Glad to hear you got it figured. I saw your fan thread and only could agree with the previous post about the probe (and I had a question about the probe).

Good luck.

I think that 795.0pacecar is correct. There is no problem with the fan itself, but the culprit is the wiring. Better check it to enjoy your new Proform item.

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