1991 1999 ford explorer chilton User Manual

Torque Specifications-3.0L Engine
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HOW TO USE THIS BOOK
506 SPECIFICATION CHARTS 

Torque Specifications-4.0L (VIN X) Engine
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SPECIFICATION CHARTS 507 

Torque Specifications-5.0L Engine
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Chilton® Automotive Information Systems. © 2004 Thomson Delmar Learning. HOW TO USE THIS BOOK
SPECIFICATION CHARTS 509 

EMISSION CONTROLS
Positive Crankcase Ventilation (PCV) System
OPERATION
The PCV valve system vents crankcase gases into the engine air intake where they are burned with the fuel
and air mixture. The PCV valve system keeps pollutants from being released into the atmosphere, and also
helps to keep the engine oil clean, by ridding the crankcase of moisture and corrosive fumes. The PCV valve
system consists of the PCV valve, its mounting grommet, the nipple in the air intake and the connecting
hoses. On...

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

PCV system hose routing for the 2.3L and 2.5L engines
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REMOVAL & INSTALLATION 513 

PCV system hose routing for the 3.0L engine-2.9L engine is similar
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514 REMOVAL & INSTALLATION 

PCV system hose routing for the 4.0L engine
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To install, attach the PCV vacuum hose to the PCV valve, then insert the valve into its mounting
grommet.
5. 
Evaporative Emission Control System
OPERATION
Fuel vapors trapped in the sealed fuel tank are vented through the orifice vapor valve assembly in the top of
the tank. The vapors leave the valve assembly through a single vapor line and continue to the carbon canister
for storage until they are purged to the engine for burning.
Purging the...

as well as, the fuel tank and fuel tank filler pipe, vapor tube and fuel vapor hoses.
Fuel Vapor (Charcoal) Canister
The fuel vapor canister is referred to as the evaporative emissions canister on 1441-44 models.
The fuel vapors from the fuel tank are stored in the fuel vapor canister until the vehicle is operated, at which
time, the vapors will purge from the canister into the engine for consumption. The fuel vapor canister contains
activated carbon, which absorbs the fuel vapor. The canister is...