PCV
PCV
Purpose
A brief description on the PCV can be found below (dot-point form for brevity, but in here as is it a lesser known part)
- PCV stands for Purge Control Valve
- PCV sends excess unburned gas in the rocker cover back to the intake
- major purpose appears to be emissions control and efficiency (giving unburned gases another chance to combust in the motor)
- bad PCVs cause:
- rough start
- rough/hunting idle
- uses oil
- The PCV on the AU Falcon is located right next to the oil cap, on the top of the engine. This is the same location and part as every Ford Falcon inline 6 engine between the EA-AU (1988-2002) models.
Diagnosis
Due to the simplicity of this part, there is a simple diagnosis step to check for failure. Simply remove the PCV and shake the assembly up and down. If you hear a somewhat loos rattling noise, then the PCV is in working order, and if it is severely muffled or non-existent, it is likely stuck or has oil ingress.
Replacement
The general consensus is that it is better to replace the PCV with an aftermarket steel based PCV, for reliability and longevity more than anything else
if you need to replace the PCV, follow the below steps:
-
gently twist and pull the PCV from the top of the rocker cover on the engine
Photo of the PCV post removal. Now is a good time to make sure the rubber gasket is in serviceable condition and also replace if required
Ensure that nothing is left behind in the engine from the old PCV, as this can cause damage if it breaks through the filter at the base of the mounting hole
-
remove the breather hose from the side of PCV assembly
Photo of PCV post-installation
- reverse previous steps with new unit to install
- done