GOLFMK8
GOLFMK7
GOLFMK6
GOLFMKV
VW GTI MKVI Forum / VW Golf R Forum / VW Golf MKVI Forum / VW GTI Forum - Golfmk6.com



Go Back   VW GTI MKVI Forum / VW Golf R Forum / VW Golf MKVI Forum / VW GTI Forum - Golfmk6.com > Technical Topics > GTI 2.0T Engine / Drivetrain / Exhaust / Tunes


Reply
 
Thread Tools Search this Thread Display Modes
Old 11-09-2018, 09:57 AM   #1
redubbed
Autocross Newbie
 
Drives: 2012 GTI
Join Date: Sep 2016
Location: E. Windsor, CT
Posts: 89
Crankcase pressure, deceleration "pulsing"

Hey all,

I've recently run in to an issue that is baffling both me & my local dealer.

After hard acceleration & in higher gears (5, 6) over 3k RPM, the car "bucks" on decel, almost as though the throttle is being lightly opened, then closed & so on. The problem is intermittent, but happens regularly when the car is hot.

Accompanying this problem is what seems to be excessive crankcase pressure, pushing oil past the seals in the valve cover/girdle. This was verified with UV dye. They may be unrelated.

Boost gauge reads normal vacuum at idle & it makes great peak boost (22+ lbs).

I pulled my GFB DV+ thinking that may have been the issue & it did have a worn seal & I didn't reinstall it, but with the stock rev. D valve, the problem persists.

I've replaced the PCV valve (latest rev.) & the PCV hoses.

I was running an ECS catch can, but bypasses it for the colder weather (it tends to fill & freeze). The problem seemed to appear after this, but that may be a coincidence.

It's a 2012 CBFA, K04, AWE boost hoses, Golf R intercooler, Fluidamper, Cobb Turbo-back, modified Volant intake, red top coils, Stratified ProTune via Cobb Access Port. Carbon cleaning was done with intake manifold replacement at 50k miles. It currently has 73,xxx miles.

The RSR clutch slips at torque peak, but that's being replaced in the spring.

Any insight would be appreciated.

Last edited by redubbed; 11-09-2018 at 03:56 PM.
redubbed is offline   Reply With Quote
Old 11-09-2018, 02:24 PM   #2
eldiablo
FIA World Rally Car Champion
 
eldiablo's Avatar
 
Drives: Hebridean Dance interior
Join Date: Nov 2012
Location: sunny side of the sinkhole, NJ
Posts: 629
Any codes? Could be throttle body or throttle body wiring issue. There is a bulletin for replacement of throttle body wiring (TSB 01-09-04).

I had same symptoms plus EPC light and code P0121. Dealer replaced throttle body and re-pinned the wires but symptoms are coming back once engine gets hot. Just replaced coilpacks to see if that makes a difference.
__________________
Pumping the air back into despair.

My Journal
eldiablo is offline   Reply With Quote
Old 11-09-2018, 02:48 PM   #3
redubbed
Autocross Newbie
 
Drives: 2012 GTI
Join Date: Sep 2016
Location: E. Windsor, CT
Posts: 89
No codes (yet), I do have VAG-COM. I pulled the TB yesterday & cleaned it, though it was hardly even dirty. Ran a TB alignment afterwards. I'll ask my dealer about the TSB.

Edit: looks like that TSB is for '08-'09 vehicles. Mine's a 2012 (edited my OP)

I'm having compression & leakdown tests done next week just to rule out rings.

Last edited by redubbed; 11-09-2018 at 02:53 PM.
redubbed is offline   Reply With Quote
Old 11-09-2018, 03:14 PM   #4
bart2278
Formula 5000 Driver
 
bart2278's Avatar
 
Drives: racecar kngikcuf a sti
Join Date: Jul 2014
Location: Indianapolis
Posts: 1,576
in 4 deets
__________________
Eurodyne Tune • ECS Intake • RSR Clutch • Peloquin LSD • Fluidampr Crank Pulley• Neuspeed FMIC • Charge & Top Pipe • Turbosmart Thing • Dieselgeek Short Throw • Eurojet Catless DP • Vanguard Catback • R8 Coils • Bosch Plugs • 034 Street Density Trans/Motor Mounts • Advanti HY Hybris Black • Conti ExtremeContact • Mabotech m380h w/tune
bart2278 is offline   Reply With Quote
Old 11-09-2018, 04:13 PM   #5
eldiablo
FIA World Rally Car Champion
 
eldiablo's Avatar
 
Drives: Hebridean Dance interior
Join Date: Nov 2012
Location: sunny side of the sinkhole, NJ
Posts: 629
out of curiosity, what type of oil are you running? My symptoms started after I used 0W oil for the 1st time (always used 5W since car was new). Probably a coincidence but who knows.
__________________
Pumping the air back into despair.

My Journal
eldiablo is offline   Reply With Quote
Old 11-09-2018, 04:32 PM   #6
redubbed
Autocross Newbie
 
Drives: 2012 GTI
Join Date: Sep 2016
Location: E. Windsor, CT
Posts: 89
5w-30, dealer oil changes & OEM filters every 5k miles
redubbed is offline   Reply With Quote
Old Yesterday, 04:47 PM   #7
redubbed
Autocross Newbie
 
Drives: 2012 GTI
Join Date: Sep 2016
Location: E. Windsor, CT
Posts: 89
Rings are good. Compression & leak down tests passed at my local dealer. Going to check the throttle body wiring next.
redubbed is offline   Reply With Quote
 
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 12:19 AM.


Powered by vBulletin® Version 3.7.2
Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.