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 > FAQs (Frequently Asked Questions) > TDI Maintenance

TDI Maintenance Archives on TDI Maintenance related items.

Reply
 
Thread Tools
Old November 20th, 2007, 14:07   #61
rdkern
Veteran Member
 
Join Date: May 2004
Location: Humboldt Co CA
Fuel Economy: A4 = wife drives it, don't know
Default

What reading do you get on the vacgauge? Do you have the necessary vacuum? Based on the "thumb pressure" it takes to move this puppy, I'd guess you're pump isn't drawing sufficient vacuum.

Boost being "laggy" is more likely to be an intake issue - clogged air filter (when last changed? If over 40K (or close to it, or serious dusty conditions) change it. Snow screen? ect.
__________________
Whitedog's in progress no-start link. http://forums.tdiclub.com/showthread.php?t=199398
Read all about it!
rdkern is offline   Reply With Quote
Old November 20th, 2007, 15:19   #62
Turbosprezarka
Veteran Member
 
Join Date: Feb 2006
Location: New England
Fuel Economy: 56.10/55-50/35.67
Default

But the pump will not show it pulling any vacuum. The pump will pull vacuum on other items. It should only take 3-5"Hg of vacuum to actuate the VNT rod, the hand pump's gauge goes to 30"Hg.
__________________
PP520s, RC3 AHF 110, PD Lift Pump, VR6/G60 clutch, VDO boost & EGT gauges, Provent, 2.5" CAT-back & cherry bomb, CAT 2u fuel filter, Koni Sports

245,000 miles and counting
Turbosprezarka is offline   Reply With Quote
Old November 20th, 2007, 16:14   #63
bmwvw
Veteran Member
 
bmwvw's Avatar
 
Join Date: Sep 2004
Location: sumter South Carolina
Fuel Economy: est low 40's city/ 47mpg highway
Default

Quote:
Originally Posted by Turbosprężarka
But the pump will not show it pulling any vacuum. The pump will pull vacuum on other items. It should only take 3-5"Hg of vacuum to actuate the VNT rod, the hand pump's gauge goes to 30"Hg.
Sounds like your accuator has a small hole in it like mine did. Just replace it and you will be fine.
__________________
I have Vag-com, PM me if in or near Sumter SC.
01 Jetta GLS TDI- Parted
98 GTI- 11.67@117.58mph-Parted
96 GTI- 12.02@124.35mph-Crappy slicks
bmwvw is offline   Reply With Quote
Old November 20th, 2007, 16:23   #64
Turbosprezarka
Veteran Member
 
Join Date: Feb 2006
Location: New England
Fuel Economy: 56.10/55-50/35.67
Default

Quote:
Originally Posted by bmwvw
Sounds like your accuator has a small hole in it like mine did. Just replace it and you will be fine.
Is this possible though? Vag-com group 11 will cycle the N75 (which you can hear), and you can see the rod move. But when I put a handpump to it, nothing happens.
__________________
PP520s, RC3 AHF 110, PD Lift Pump, VR6/G60 clutch, VDO boost & EGT gauges, Provent, 2.5" CAT-back & cherry bomb, CAT 2u fuel filter, Koni Sports

245,000 miles and counting
Turbosprezarka is offline   Reply With Quote
Old November 21st, 2007, 09:33   #65
rdkern
Veteran Member
 
Join Date: May 2004
Location: Humboldt Co CA
Fuel Economy: A4 = wife drives it, don't know
Default

It sounds to me like you're doing something wrong with the handpump. I can't imagine what - but you should be hearing a leak if there is one, and getting some evidence of vacuum if you're pumping on a semi-closed system. If the hole was big enough to keep you from causing a negative pressure with your handpump, I'd suspect it wouldn't cycle really nicely with the N75/other system.
__________________
Whitedog's in progress no-start link. http://forums.tdiclub.com/showthread.php?t=199398
Read all about it!
rdkern is offline   Reply With Quote
Old November 23rd, 2007, 20:02   #66
bmwvw
Veteran Member
 
bmwvw's Avatar
 
Join Date: Sep 2004
Location: sumter South Carolina
Fuel Economy: est low 40's city/ 47mpg highway
Default

Well if you verifyied the pump, hose and the N-75 valve this would be the last place to look for a vacuum leak. The vnt accuator should hold vacuum.
__________________
I have Vag-com, PM me if in or near Sumter SC.
01 Jetta GLS TDI- Parted
98 GTI- 11.67@117.58mph-Parted
96 GTI- 12.02@124.35mph-Crappy slicks
bmwvw is offline   Reply With Quote
Old November 24th, 2007, 19:15   #67
Turbosprezarka
Veteran Member
 
Join Date: Feb 2006
Location: New England
Fuel Economy: 56.10/55-50/35.67
Default

It must be that the VNT has a pin hole, where the steady vacuum of the engine can maintain a reduced fraction of its operation...and the hand pump just won't show it holding any vacuum because it isn't constant.
__________________
PP520s, RC3 AHF 110, PD Lift Pump, VR6/G60 clutch, VDO boost & EGT gauges, Provent, 2.5" CAT-back & cherry bomb, CAT 2u fuel filter, Koni Sports

245,000 miles and counting
Turbosprezarka is offline   Reply With Quote
Old December 21st, 2007, 07:44   #68
zoot
Newbie
 
Join Date: Aug 2004
Default

I asked a answered question. Deleting it.
zoot is offline   Reply With Quote
Old February 5th, 2008, 15:24   #69
jeffro1979
Newbie
 
Join Date: Feb 2008
Location: Victoria, BC
Default

I just read this and wow, sure sounds like what I'm seeing. Mine seems to happen more in hot weather. Does anyone have any input on that?
jeffro1979 is offline   Reply With Quote
Old February 5th, 2008, 21:54   #70
Canadian_Grizzly
Veteran Member
 
Canadian_Grizzly's Avatar
 
Join Date: Apr 2005
Location: British Columbia, Canada
TDI(s): 02 Jetta TDI
Default

Quote:
Originally Posted by jeffro1979
I just read this and wow, sure sounds like what I'm seeing. Mine seems to happen more in hot weather. Does anyone have any input on that?
Check the routing of your vacuum lines. If hot weather has an effect it could be a line too close to the manifold and collapsing when the rubber is hot and pliable.
__________________
Byron
Driver Found!

"There is lots of work to be done, if we are to achieve the kind of society people have the right to expect." Tommy Douglas

Having trouble with limp mode... Troubleshooting Low Power

Having trouble searching? Read this thread on advance search in forum http://forums.tdiclub.com/showthread.php?t=133579
Canadian_Grizzly is offline   Reply With Quote
Old February 6th, 2008, 09:02   #71
jeffro1979
Newbie
 
Join Date: Feb 2008
Location: Victoria, BC
Default thanks

thanks for the input, I'm going to work on it this weekend and we'll see how it goes. thanks all
jeffro1979 is offline   Reply With Quote
Old February 13th, 2008, 19:16   #72
marcus_ishere
Newbie
 
marcus_ishere's Avatar
 
Join Date: Feb 2008
Location: North East, oregon
Fuel Economy: Tba
Default On that note...

Okay, I have the same issue. But I have replaced the n-75. I have cleaned the intake and turbo 20,000 miles ago.. I just straight piped my baby, and the cat wasnt the issue. I get it too. But what I believe is that I have a faulty egr valve controller. My solution is the racepipe by dieselgeek and egr delete. Who knows? if I do put this part on.. What is it going to do to my Ecu? And how do I cut the controller out of my Ecu? Vag Com?
marcus_ishere is offline   Reply With Quote
Old February 18th, 2008, 16:46   #73
Briank2
Newbie
 
Join Date: Feb 2008
Location: Salt Lake City Utah
TDI(s): 1998 Jetta
Default N75 Valve

After reading the forum on "limp mode" my N75 valve clicks constantly right after I turn the ignition switch on, and I get an intermittent limp mode situation. I had a diognostic done and was told my ECU had an internal error. Could this cause the limp mode problem. I changed out the N75 valve and it does the same thing. Any input greatly appreciated.
Briank2 is offline   Reply With Quote
Old February 24th, 2008, 07:32   #74
SheeB
Veteran Member
 
Join Date: Jul 2007
Location: Ottawa, ON
Default

Canadian Grizzly,

I may be wrong here but according to your link for the McMaster replacement tubing, for the Viton tubing you have 5119K41 @ $3.69/ft. listed as "firm" where as on the McMaster catalog its listed as 5119K79 @ $3.22/ft.
SheeB is offline   Reply With Quote
Old February 24th, 2008, 09:27   #75
Canadian_Grizzly
Veteran Member
 
Canadian_Grizzly's Avatar
 
Join Date: Apr 2005
Location: British Columbia, Canada
TDI(s): 02 Jetta TDI
Default

The part number has probably changed...go with the description.
__________________
Byron
Driver Found!

"There is lots of work to be done, if we are to achieve the kind of society people have the right to expect." Tommy Douglas

Having trouble with limp mode... Troubleshooting Low Power

Having trouble searching? Read this thread on advance search in forum http://forums.tdiclub.com/showthread.php?t=133579
Canadian_Grizzly 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
Diagnosing and Fixing Limp mode for A4 1.9TDI [low power troubleshooting] Canadian_Grizzly TDI 101 600 June 13th, 2019 12:23
Audi A4 Low power and limp mode and other problems arijus TDI 101 5 August 9th, 2018 15:34
Low power,limp mode vrus13 VW B5 Passat TDIs 6 October 30th, 2012 09:26
Low Power, no limp mode TDIBrandon VW MKIV-A4 TDIs (VE and PD) 6 February 27th, 2012 04:44
First time diagnosing low power / 1x/limp kiva822 TDI 101 35 July 30th, 2011 05:10


All times are GMT -7. The time now is 01:16.


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 0.16813 seconds with 11 queries
[Output: 128.05 Kb. compressed to 107.13 Kb. by saving 20.92 Kb. (16.34%)]