www.tdiclub.com

Economy - Longevity - Performance
The #1 Source of TDI Information on the Web!
Forums Articles Links Meets
Orders TDI Club Cards TDIFest 2016 Gone, but not forgotten VAG-Com List Unit Conversions TDIClub Chat Thank You

Order your TDIClub merchandise and help support TDIClub


Go Back   TDIClub Forums > VW TDI Discussion Areas > TDI 101

TDI 101 Got a simple/basic TDI question? Are you a newbie (new to the forums). Feel free to post your question here.

Reply
 
Thread Tools
Old May 19th, 2019, 03:20   #1
POWERSTROKE
Veteran Member
 
POWERSTROKE's Avatar
 
Join Date: Jul 2000
Location: Staten Island (The Dump)
TDI(s): 2002 Golf
Default Very random overboost.

The vacuum can is in good condition and adjusted properly. About two months ago I went into limo mode, and it was from overboost. I believe the vanes are slightly sticky. I started to drive more aggressively and it seems to have gone away for a couple months. Took several 1000 mile round trips. Car was running like a top doing 70-100mph on a 800-1000 mile trip this past weekend. On my way back home I felt it go i to limp while accelerating in 3rd in a traffic slowdown. Restarted the car and was fine for the rest of the 160 miles back. My question is what is causing this very random and far spaced out overboost. I could drive aggressively now for two thousand miles and it could be perfect and then boom. It happens. 2002 Golf tdi.
__________________
It's kind of fun to do the impossible.-Walt Disney
POWERSTROKE is offline   Reply With Quote
Old May 19th, 2019, 04:15   #2
Fahrvegnugen
Veteran Member
 
Join Date: Jan 2017
Location: Burlington Vt
Default

This happens to me too on occasion. Yours does sound like sticky vanes. My maf has a faulty clip so I slide it on as tightly as I can and it usually works. I dont throw codes just loose boost for a time, then back to normal.
Fahrvegnugen is offline   Reply With Quote
Old May 19th, 2019, 04:31   #3
POWERSTROKE
Veteran Member
 
POWERSTROKE's Avatar
 
Join Date: Jul 2000
Location: Staten Island (The Dump)
TDI(s): 2002 Golf
Default

What can I do? Italian tune up.
__________________
It's kind of fun to do the impossible.-Walt Disney
POWERSTROKE is offline   Reply With Quote
Old May 19th, 2019, 10:30   #4
Fahrvegnugen
Veteran Member
 
Join Date: Jan 2017
Location: Burlington Vt
Default

Italian tune up is preventative. I do it whenever possible. I was going nuts with that technique since I didn’t want to buy a new turbo. Then I got some unwanted recognition for my driving habits and decided to sprayed easy off into the exhaust side of the turbo and that made it so I could get up hills but I still got overboost so I replaced the thing. Getting under the car to spray skin melting chemicals is not fun, and it might not work.

Last edited by Fahrvegnugen; May 19th, 2019 at 10:34.
Fahrvegnugen is offline   Reply With Quote
Old May 19th, 2019, 13:24   #5
POWERSTROKE
Veteran Member
 
POWERSTROKE's Avatar
 
Join Date: Jul 2000
Location: Staten Island (The Dump)
TDI(s): 2002 Golf
Default

Mine literally has only been doing it once every 3 months for the past 6 months. I drive all through the white mountains with no problems. Wasn’t til I got back to Connecticut on flat ground in traffic that it did it.
__________________
It's kind of fun to do the impossible.-Walt Disney
POWERSTROKE is offline   Reply With Quote
Old May 20th, 2019, 09:13   #6
flee
Veteran Member
 
flee's Avatar
 
Join Date: Sep 2011
Location: Chatsworth, CA
Fuel Economy: 40-ish
Default

This could be vacuum related. Check each component and the booster hose for leaks.
__________________
2002 Jetta GLS TDI wagon
flee is offline   Reply With Quote
Old May 20th, 2019, 09:33   #7
vandermic07
Veteran Member
 
Join Date: Jun 2011
Location: West Central Pennsylvania
Fuel Economy: 47-51 MPG
Default

Watch doing Italian tunes if you are frequently overboosting.

my 01 was over boosting due to sticky vanes. We were on vacation in Texas on long rolling hills doing 70 mph. It did it 3 times in one day and once on a really steep hill. When i got home a few weeks after, i decided to do an Italian tune up. I down shifted into 3rd and stepped into it, then my IC blew the bottom off when it spooled up. Exciting stuff. i removed the down pipe and used seafoam. Then worked the actuator lever by hand until it didnt stick anymore. Worked for almost 1 yr. I just did an tune up a few weeks ago and went into limp. this was at 4000 rpms in 3rd for prolonged period of time.
vandermic07 is offline   Reply With Quote
Old June 3rd, 2019, 09:27   #8
vandermic07
Veteran Member
 
Join Date: Jun 2011
Location: West Central Pennsylvania
Fuel Economy: 47-51 MPG
Default

FYI

Just did the Seafoam cleaning to the 01 Golf over the weekend. The car is boosting fine again. Its a little smokey till the Seafoam burns off.
vandermic07 is offline   Reply With Quote
Old June 3rd, 2019, 09:45   #9
oilhammer
Certified Volkswagen Nut Vendor
 
oilhammer's Avatar
 
Join Date: Dec 2001
Location: St Louis
Fuel Economy: fantastic
Default

Most of the time, it will end up needing a new turbo if you cannot get it cleaned out. Driving the car "spirited" often will prevent it from ever happening in the first place.

Another, less common, but possible, is an N75 valve that is not able to release vacuum quick enough due to debris inside, but that is usually from a rusted out VNT actuator.
__________________
oilhammer
www.cardocautomotive.com
oilhammer is offline   Reply With Quote
Old June 3rd, 2019, 09:57   #10
Nevada_TDI
Veteran Member
 
Join Date: Aug 2008
Location: Reno, sort of...
Default

I had a weird thing a month or so ago... I kept getting over boost and although the nut on the actuator arm needed a wrench to loosen it, I lengthen it a couple of turns and the problem went away. I still have the occasional over boost/cough but it usually only happens when the engine is not warmed up to operating temp.
__________________
_______________
2001 Jetta GL TDI, Tinted, Vented, No Kitty, EGR-ectomy, TDTuning, HIFLO .216's, TurboLabAmerica Hybrid 15-17/56, VCDS Hex+CAN, S-B Daily Driver 2 Clutch, DG Short Shifter, Frostheater, Baldwin Fuel Filter, Koni Orange, New Paint. Previous Diesel: 1983 Rabbit Diesel
Nevada_TDI is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Random...But sandmansans VW MKVI-A6 Jetta Sedan (~ 2011+) 9 June 24th, 2014 06:36
random stumble ramicator VW MKVI-A6 Jetta Sedan (~ 2011+) 6 March 26th, 2014 08:49
Random power loss? Random limp mode? Tatkins85 TDI 101 2 March 3rd, 2013 07:45
Still new, and asking random questions, here is another tbone1989 TDI 101 2 December 27th, 2011 13:10
Random thoughts Arthur General VW Discussion 5 August 5th, 2004 15:58


All times are GMT -7. The time now is 03:34.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Copyright - TDIClub Online LTD - 2017
Contact Us | Privacy Statement | Forum Rules | Disclaimer
TDIClub Online Ltd (TDIClub.com) is not affiliated with the VWoA or VWAG and is supported by contributions from viewers like you.
1996 - 2017, All Rights Reserved
Page generated in 0.15473 seconds with 13 queries
[Output: 96.21 Kb. compressed to 81.55 Kb. by saving 14.65 Kb. (15.23%)]