Ford Ranger Maintaince And Repair Manual page 516

5. Disconnect the closure (fresh air) hose from the air inlet tube (connects the air cleaner housing to the
throttle body).
6. Place a stiff piece of paper over the hose end and wait 1 minute.
1. If vacuum holds the paper in place, the system is OK; reconnect the hose.
2. If the paper is not held in place, check for loose hose connections, vacuum leaks or blockage.
Correct as necessary.
REMOVAL & INSTALLATION
1. Disconnect the vacuum hose from the PCV valve.
2. Remove the PCV valve from its mounting grommet.
512
HOW TO USE THIS BOOK
Check the PCV valve for vacuum at idle
TESTING