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Old 03-07-2018, 01:19 AM   #1
edwardnese
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How to test for bad PCV?

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?
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Old 03-07-2018, 01:57 AM   #2
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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.

Last edited by Wascally Wabbit; 03-07-2018 at 02:05 AM.
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Old 03-07-2018, 02:03 AM   #3
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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
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Old 03-07-2018, 03:01 AM   #4
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Originally Posted by snobrdrdan View Post
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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Old 03-07-2018, 04:33 AM   #5
Carlosfandango
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Originally Posted by edwardnese View Post
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 youíre getting other symptoms,

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


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Old 03-07-2018, 02:50 PM   #6
edwardnese
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Originally Posted by Carlosfandango View Post
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 youíre 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.
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Old 03-07-2018, 03:01 PM   #7
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Originally Posted by edwardnese View Post
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 CELís 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 wasnít 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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Old 03-07-2018, 08:05 PM   #8
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i replaced mine at 55k for peace of mind
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Old 03-08-2018, 12:24 AM   #9
edwardnese
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Originally Posted by Carlosfandango View Post
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 CELís 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 wasnít 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.
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Old 03-08-2018, 12:30 AM   #10
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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.
at a shop rear main seal alone will prob be around 1500. All labor due to removing transmission, bit more difficult if youre DSG.
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Old 03-08-2018, 05:52 PM   #11
edwardnese
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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
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Old 03-08-2018, 07:08 PM   #12
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How to test for bad PCV?

Quote:
Originally Posted by edwardnese View Post
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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