PCV CONFUSION

AKellner · Post by **AKellner** » 29 Jul 2020, 14:51

Hello, all. I hope i'm posting the right thing in the right place. I have a 2011 c30 t5 r design that i'm 90% sure has a clogged pcv system. I have a turbo gauge which i assume measures manifold vacuum. I have been babying the car, keeping the pressure in the negative by driving and accelerating very slowly. I'm confused though, at the filler cap, I have vacuum at idle. Hard vacuum. Before i started babying it, when i first suspected there was a problem, I left my dipstick out a little cause i'm terrified of blowing a main seal, it blasted some oil onto the engine while i was driving. At least I think it came from the dipstick tube. There are also two banjo bolts on the front of the block with what i suspect is oil lines coming from them. One of them is tucked behind the oil filter housing and looks like it might have a tiny knick in it but i just can't tell for sure. I'm a mess, the cars a mess and i am stressed tf out about it. This is just the tip of the ice-burg and most pressing issue but there are others, many others. I'm just trying to deal with things one at a time in order of severity. Anyone have any advice? I really need to drive to work and back but i will find another way if it risk damaging anything...

Post by **MoVolvos** » 29 Jul 2020, 17:57

*

See if this shed more light.

viewtopic.php?f=25&t=94586

*

AKellner · Post by **AKellner** » 29 Jul 2020, 22:30

A little. The sound isn't near as loud as his. In fact, I don't really hear vacuum like that at all. In first gear when I am accelerating, i hear something winding up. Like a whistle but one that gets higher pitched with the RPMs.

Jakesvolvos · Post by **Jakesvolvos** » 28 Apr 2021, 10:02

I have the same thing on 2006 xc90, what was it?

jenkinskg · Post by **jenkinskg** » 17 Apr 2023, 09:13

Similar on my 2011 c30 T5, just got replacement pcv catch can. old one was not clogged or dirty, neither was the holes into the block.
Mine had high vaccuum and whistle when warm and idle.
Relieved when I pulled the dipstick also.

jenkinskg · Post by **jenkinskg** » 17 Apr 2023, 09:55

Also have this

The P0507 code is related to the idle control system and indicates that the engine's idle speed is higher than expected, resulting in a high idle condition. This can be caused by a few different factors, including:

Dirty throttle body: If the throttle body is dirty or clogged, it can restrict airflow and cause the engine to idle higher than expected.

Vacuum leak: A vacuum leak in the engine's intake system can allow unmetered air to enter the engine, which can cause the idle speed to increase.

Faulty idle air control (IAC) valve: The IAC valve regulates the engine's idle speed by controlling the amount of air that bypasses the throttle plate. If the IAC valve is malfunctioning, it can cause the idle speed to be too high.

Faulty mass airflow (MAF) sensor: The MAF sensor measures the amount of air entering the engine and sends this information to the engine control module. If the MAF sensor is faulty, it can cause the engine to run lean, which can result in a high idle condition.

Faulty engine coolant temperature (ECT) sensor: The ECT sensor measures the temperature of the engine's coolant and sends this information to the engine control module. If the ECT sensor is faulty, it can cause the engine to run rich, which can result in a high idle condition.