Thanks for your question. This can mean alot of different things. The first thing I would check is to make sure all the vacuum lines are on where they are suppose to be. Thermactor air pump is hooked up yes?
The solenoids, make sure they are all hooked up electrically.
If you have a vacuum pump, you can hook it to the bypass valve. This valve is fairly close to the pump, just follow the hose from the pump.
Let me know what you find.
Thanks
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FORD MOTOR COMPANY CAR AND POWERSTROKE SPECIALIST FOR OVER 16 YEARS. ASE MASTER SINCE 1991. CURRENTLY WORK AT A MAJOR FORD DEALERSHIP. GIVE ME YOUR FORD PRODUCT QUESTIONS, IF I HELPED, PLEASE HIT THE ACCEPT BUTTON. EXPERTS QUESTIONS ON FORDS WELCOMED

