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FCP EURO PCV Failure Symptoms and Diagnosis for your XC90!

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
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FCPEURO
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Year and Model: 2006 XC90 V8
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FCPEURO

FCP EURO PCV Failure Symptoms and Diagnosis for your XC90!

Post by FCPEURO » Fri Nov 20, 2015 11:02 am

Hey Guys,

From fielding the majority of the Volvo inquires over here at FCP EURO I commonly receive questions and concerns about our Volvo PCV Systems. We currently offer a wide array of breather kit solutions which I've included a link for below however I just wanted to reach out to the Mathews community and touch base on some of the common causes, symptoms, and diagnosis for everyone to look out for when trying to determine if they have a clogged up system.

Volvo PCV Breather System Kits

Volvo's have been known notoriously for their clogged PCV systems. Over the course of time your Volvo's PCV system can become restricted which can lead to a number of issues including buildup in crankcase pressures which result in engine oil consumption and/or leaks from pushed out engine seals. Below we've gone over some of the common causes, symptoms, and diagnosis of PCV system failure.

Image

What causes your breather system to fail?
  • Wrong oil grade, quality and/or viscosity
  • Vehicles driven too many miles between oil changes
  • Vehicles frequently driven short distances with many cold starts
  • Excessive idling
  • Fuels of low quality or with high alcohol content
  • Additives added to oil or fuel
  • High ambient temperature
  • High air humidity
  • Some of the symptoms you can expect if your breather system is clogged?
  • Illuminated oil pressure lamp. – Due to clogged oil suction strainer to oil pump or oil filter
  • Illuminated Check Engine Lamp- Due to incorrect engine fuel trim level
Some of the symptoms you can expect if your breather system is clogged?
  • Illuminated oil pressure lamp. – Due to clogged oil suction strainer to oil pump or oil filter
  • Illuminated Check Engine Lamp- Due to incorrect engine fuel trim level parameters
  • Noise (whistling) – Noise due to high pressure in crankcase. This noise will stop if the oil filler cap is removed.
  • Poor Drivability- Clogged crankcase ventilation can reduce the engine performance
  • Uneven / Oscillating Idling- Caused by clogged crankcase ventilation
  • Oil leak- From engine seals due to restricted crankcase ventilation
  • Noise (knocking)- Low oil pressure can cause premature bearing wear and lead to internal engine component failure
  • High oil consumption/noise from Turbo
  • A damaged bearing or seal in the turbo due to lack of oil as a result of oil consumption.
How to check for it?
  • The first step is to inspect the oil filter to see if it is abnormally dirty. An abnormally dirty filter is easily recognized by its thick, black deposits
  • If the engine has a problem with carbon deposits, the passageways in the engine block and oil trap may be completely or partially clogged. Remove and check the oil trap, hoses and their passageways in the engine block. There should not be any major collections of carbon deposits in the hoses or in the passageways in the block.
  • Drain the engine oil. Remove the oil pan and check the oil pan and crankcase for deposits. Normally, there should not be any deposits. Also check the oil suction strainer on the oil suction line for contaminants and deposits.
  • Use a low caliber Vacuum gauge to check for positive pressure through the dipstick tube
What Else?

Another note to add would be to check the passage from the bottom of the breather box into the block which flows into the oil pan. If this passage is clogged then just replacing the breather box will not fix the vehicle alone. In extreme cases if the passage is blocked then you will have to remove the oil pan to de-sludge that as well. To confirm that it's clear once its been cleaned you can blow compressed air into the block. Be sure to remove the oil cap first before you do this to make sure pressure doesn't build up inside the engine. To confirm that the oil pan is cleared once its removed and desludged (oil pan removed off the vehicle) you can use compressed air to blow through the passage way inside the oil pan to be sure that the channel is clear. See below:

A Good example of a clogged block passage: Image
A Good Example of a clogged oil pan passage: Image

You can find all of our breather system kits by clicking HERE



As always, if there's anything that I can personally help with please feel free to email me directly at [email protected]
Jason VanGorden
Volvo Product Manager
[email protected]

FCP Euro - European Car Parts Specialists
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