How to test for bad PCV?

[edwardnese]

Hey guys i did some research and there seems to be multiple ways to test a bad PCV but i am still confused as to what signs to look for. So far i tested by:

1. Start engine leave it idling, remove engine oil cap, engine starts sputtering and vibrating pretty hard.

Does this mean that my PCV is still good?

[Wascally Wabbit]

Yes I think that is normal. I believe if there is no change it is bad. I just replaced mine so I know it is good and my car does the same as yours when I remove the oil cap.

[snobrdrdan]

If higher mileage, just change it out for a new one since it is a maintenance item.
It's a simple swap and a pretty cheap part

[Boscogn]

Originally Posted by snobrdrdan

If higher mileage, just change it out for a new one since it is a maintenance item.
It's a simple swap and a pretty cheap part

Hehe I thought u were trolling by telling them to change oil cap but I'm drinking and it just dawned on me ur talking about pcv

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[Carlosfandango]

Originally Posted by edwardnese

Hey guys i did some research and there seems to be multiple ways to test a bad PCV but i am still confused as to what signs to look for. So far i tested by:

1. Start engine leave it idling, remove engine oil cap, engine starts sputtering and vibrating pretty hard.
   

Does this mean that my PCV is still good?

That DOES generally mean the PCV is good, however they can fail in several different ways and most do not directly produce any fault codes, but yours is probably good unless you’re getting other symptoms,

Take a look at this,
https://youtu.be/hQEciqR1ST8


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[edwardnese]

Originally Posted by Carlosfandango

That DOES generally mean the PCV is good, however they can fail in several different ways and most do not directly produce any fault codes, but yours is probably good unless you’re getting other symptoms,

Take a look at this,
https://youtu.be/hQEciqR1ST8


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Thanks for that link, i am only suspecting PVC failure because i have a slow oil leak that happened recently about the size of 2 quarters that drips only after i have driven the car. Read online that a bad pcv can cause pressure buildup which would then blow our the rear main seal, but i havent gotten any CELs or fault codes.

[Carlosfandango]

Originally Posted by edwardnese

Thanks for that link, i am only suspecting PVC failure because i have a slow oil leak that happened recently about the size of 2 quarters that drips only after i have driven the car. Read online that a bad pcv can cause pressure buildup which would then blow our the rear main seal, but i havent gotten any CELs or fault codes.

I had a failed PCV last year that also took out the rear main! The only symptom was oil dripping from the join between the transmission and engine which started as a few drips but quickly got much worse, I had no CEL’s or fault codes, the PCV rarely logs any faults (directly) if at all, I also had to change the clutch as oil had got onto it as I left it a bit too long! I also changed the flywheel as it had to come off to do the seal so it wasn’t a cheap repair for me, if it is your rear main be sure to use the latest revision and fit it correctly (not like the old revision) or it will leak again straight away!


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[markus037]

i replaced mine at 55k for peace of mind

[edwardnese]

Originally Posted by Carlosfandango

I had a failed PCV last year that also took out the rear main! The only symptom was oil dripping from the join between the transmission and engine which started as a few drips but quickly got much worse, I had no CEL’s or fault codes, the PCV rarely logs any faults (directly) if at all, I also had to change the clutch as oil had got onto it as I left it a bit too long! I also changed the flywheel as it had to come off to do the seal so it wasn’t a cheap repair for me, if it is your rear main be sure to use the latest revision and fit it correctly (not like the old revision) or it will leak again straight away!


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How much was the cost for your jobs? and how long would u say u had the dripping oil issue for? so far its been half a week for me.

[BudgetPhoenix]

Originally Posted by edwardnese

How much was the cost for your jobs? and how long would u say u had the dripping oil issue for? so far its been half a week for me.

at a shop rear main seal alone will prob be around 1500. All labor due to removing transmission, bit more difficult if youre DSG.

[edwardnese]

Originally Posted by BudgetPhoenix

at a shop rear main seal alone will prob be around 1500. All labor due to removing transmission, bit more difficult if youre DSG.

jesus thats quite a bit my car on kbb is only worth 6-7.5k and i already threw in 1800 in repairs this year for intake cleaning, and timing chain tensioner update.

In a dilemma now

[Carlosfandango]

Originally Posted by edwardnese

jesus thats quite a bit my car on kbb is only worth 6-7.5k and i already threw in 1800 in repairs this year for intake cleaning, and timing chain tensioner update.



In a dilemma now

£1189.08 GBP for me, (around $1650 US)

the clutch and flywheel were at cost price as the shop owed me a favour and the PCV was free due to the previous one only lasting a few months causing the rear main problem!






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