Pcv Valve; Checking The Pcv Valve - Volvo 5.0OSiE-J Operator's Manual

VPA 7748131 English 09-2007
23674

PCV Valve

The PCV (Positive Crankcase Ventilation) valve con-
trols engine emissions by returning crankcase blowby
gases to the engine's intake manifold to be burned. A
clogged or stuck PCV valve may result in poor engine
performance and stalling. For optimal engine perform-
ance, PCV valves should be inspected and replaced
according to the maintenance schedule.
The 8.1 Liter engine does not have a PCV valve.

Checking the PCV Valve

To check the PCV valve for clogs or malfunction, use
the following steps:
1. Ensure that the engine is turned off and the key
has been removed from the ignition.
2. Locate and remove the PCV valve from the valve
cover by holding it at the elbow and pulling it out.
NOTICE! Do not pull on the hose to remove the PCV
valve; the hose may come off, leaving the
valve in place.
3. Shake the PCV valve. A rattling sound indicates
that the valve is not clogged. If you do not hear a
rattling sound, chances are the valve is clogged
and needs to be replaced.
4. Replace the PCV valve by pressing it firmly back
into PCV valve receptacle in the valve cover.
Maintenance
65