GolfGTIforum.co.uk
Model specific boards => Golf mk6 => Topic started by: Charliemk6 on 23 May 2019, 12:08
-
Hi all, still troubleshooting rough idle.
I've heard there is a test to see if pcv is faulty by blowing in to it?
I e tried it with the top pipe and cannot blow through it, only suck?
Does this mean it's ok?
Any help appreciated!
(https://www.fiatforum.com/gallery/data/500/medium/20190523_120223.jpg)
-
Lots of MK5 info https://www.mk5golfgti.co.uk/forum/index.php?topic=40374.0 less on the MK6
-
I'd read somewhere that while the engine is running, remove dipstick. If it stutters, pcv is OK.
-
Not sure how test off the car but if you remove the dipstick the car should stutter very slightly then return to normal. If it keeps stuttering or stutters alot its faulty. See video in below quote for a working one.
Something else that needs checking with the pcv fails is the rear main seal as if the pcv valve has failed for a period of time then the presure normally turns the rear main seal inside out or unseats it.
Check for an oil leak under the car between the gearbox and engine. It normally leaks out the hole on the bottom of the gearbox bell casing. Then runs along the sump and engine bottom bracing. If the seal is even leaking slightly it can cause a rough idle.
Kept forgetting to do this so sorry for delay but here's mine for comparison:
(https://c4.staticflickr.com/6/5581/29823223083_755bc9f760_b.jpg) (https://flic.kr/p/MrnPcr)
-
Not sure how test off the car but if you remove the dipstick the car should stutter very slightly then return to normal. If it keeps stuttering or stutters alot its faulty. See video in below quote for a working one.
Something else that needs checking with the pcv fails is the rear main seal as if the pcv valve has failed for a period of time then the presure normally turns the rear main seal inside out or unseats it.
Check for an oil leak under the car between the gearbox and engine. It normally leaks out the hole on the bottom of the gearbox bell casing. Then runs along the sump and engine bottom bracing. If the seal is even leaking slightly it can cause a rough idle.
Kept forgetting to do this so sorry for delay but here's mine for comparison:
(https://c4.staticflickr.com/6/5581/29823223083_755bc9f760_b.jpg) (https://flic.kr/p/MrnPcr)
Hi Snoopy, this is in fact what happened - the PCV failure caused the rear main oil seal to fail, so even when I replaced the PCV the issue continued. Spotted the oil leak and realized the issue.
This was costly and very frustrating, because of this PCV failure it has cost me over £600 to repair as the whole Gearbox has to be dropped. I ended up changing the clutch at the same time and replacing the rear main oil seal with a much stronger revised version.
Seems that this version of the Golf was designed with lots of weak parts prone to failure...
Anyways its all done now after several months of aggro!
Thanks for you reply Snoopy - hopefully this thread will help someone in future.
-
for reference the uprated oem seal is much better but is a pain to fit as needs a special tool due to its design. If you dont use the tool it may not seal correctly and leak again resulting in it needs changing again.
The other option is to use this. :smiley:
https://www.ecstuning.com/b-iabed-industries-parts/billet-aluminum-rear-main-seal-upgrade/462-103-171f~iab/#tabProductDetails
Imo every modern car has the possibilities of issues due to design tolerances v cost its not just VWs or this particular model. im from a family of car enthusiasts most of them work in the trade so I get to hear most the stories. As an example we did the crank seal on my cousins BMW 3 series about 6 month ago because it did more or less what happened to your GTI.