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 2nd, 2020, 21:28   #1
jimmy0000
Newbie
 
Join Date: Nov 2006
Location: san francisco
TDI(s): 2003 jetta
Fuel Economy: 40 average
Default Low power - Sometimes.

Hi All,


I have 2003 TDI, 274k miles, 5spd manual, there is no check engine light.



I have weird low power issue where sometimes when i start the car it might be at 25% power, barley able to idle, or run just fine.



If the engine power is low i will just pull over turn it off wait 5 seconds, turn the key on until the glow plug light goes off it normally then runs fine.



Recently its been happening more and more.



Any troubleshooting suggestions or info would be helpful.


Thank you
jimmy0000 is offline   Reply With Quote
Old May 2nd, 2020, 21:36   #2
GlowBugTDI
Veteran Member
 
GlowBugTDI's Avatar
 
Join Date: Jul 2018
Location: Cambridge, MN
Fuel Economy: 43 mpg average
Default

few things to check. 1 small boost leak causing limp mode. 2 failing MAF sensor. 3 clogged egr/intake (sounds to be least likely, but could check it out anyway sense your in there...).
i had the same thing happen in both of my cars 1 was the brake booster cable had a crack, and the 2nd was a bad maf sensor.
GlowBugTDI is offline   Reply With Quote
Old May 3rd, 2020, 02:23   #3
Tdijarhead
Veteran Member
Default

You’re in limp mode. Here is Canadian grizzly’s limp mode how to.

http://forums.tdiclub.com/showthread...zzly+limp+mode
Tdijarhead is offline   Reply With Quote
Old May 3rd, 2020, 12:36   #4
jimmy0000
Newbie
 
Join Date: Nov 2006
Location: san francisco
TDI(s): 2003 jetta
Fuel Economy: 40 average
Default

Thank you, I'll troubleshoot and post back later, May be a little bit do to shelter in place.


Kind regards,
jimmy0000 is offline   Reply With Quote
Old May 3rd, 2020, 20:10   #5
GlowBugTDI
Veteran Member
 
GlowBugTDI's Avatar
 
Join Date: Jul 2018
Location: Cambridge, MN
Fuel Economy: 43 mpg average
Default

Perfect time to spend with family, and do maintenance!

Sent from my SAMSUNG-SM-G890A using Tapatalk
GlowBugTDI is offline   Reply With Quote
Old May 3rd, 2020, 20:29   #6
Vince Waldon
Veteran Member
 
Vince Waldon's Avatar
 
Join Date: Apr 2009
Location: Edmonton Alberta Canada
Default

I'm going to take a contrary view and say that it doesn't sound like limp mode to me, if it's causing idling issues and happens right after you've started and before you're really asking the turbo to do anything.

My internet guess is EGR valve sticking partially open now and then. Cycling the power forces it to attempt to close, which it is able to do the second time.

In any event, a scan with a quality VW-specific scanner is probably a good starting place... turbo issues will be pretty evident.
__________________
Vince Waldon Edmonton AB Canada
Canadian Grizzly's excellent low-power/limp mode troubleshooting guide
VW's TSB for scientifically tracking down parasitic current drains
Vince Waldon is online now   Reply With Quote
Old May 23rd, 2020, 12:08   #7
jimmy0000
Newbie
 
Join Date: Nov 2006
Location: san francisco
TDI(s): 2003 jetta
Fuel Economy: 40 average
Default

Hi Vince,


I tend to agree, I haven't used my scanner because there is no check engine light (i assume no light = no codes). The EGR is $200 (non vw) I think I'll get a can of carb cleaner and see how that goes on helping the situation. I did replace all of the 3mm vacuum hoses, need to order some 5mm hoses and replace those next. Thanks to TDIJarHead for the limp mode post that had links to order vacuum hoses. (no change with the 3mm hoses updated).
jimmy0000 is offline   Reply With Quote
Old May 23rd, 2020, 14:03   #8
Vince Waldon
Veteran Member
 
Vince Waldon's Avatar
 
Join Date: Apr 2009
Location: Edmonton Alberta Canada
Default

A couple of further thoughts:

1) it's possible for there to be pending codes without the CEL being on, so a VCDS scan could still be helpful

2) since you have VCDS you can pretty quickly test your EGR to see if it's closing all the way every time

- physically remove the EGR (two hex bolts)
- clean it, if required
- reconnect its wiring harness and place it somewhere on top of the engine where you can easily see it
- after turning the key to "on", run the EGR output test using VCDS (right hand side of the Engine module screen, IIRC). The EGR will open and close, and you should be able to confirm that it closes all the way every time. You may want to shine a light on it while it's moving to confirm.

As the bushing wears or if it's jammed up with carbon etc it can jam the plunger slightly open, causing bypass airflow that hidden from the ECU and power/driveability issues.
__________________
Vince Waldon Edmonton AB Canada
Canadian Grizzly's excellent low-power/limp mode troubleshooting guide
VW's TSB for scientifically tracking down parasitic current drains
Vince Waldon is online now   Reply With Quote
Old May 23rd, 2020, 14:40   #9
jimmy0000
Newbie
 
Join Date: Nov 2006
Location: san francisco
TDI(s): 2003 jetta
Fuel Economy: 40 average
Default

It still has intermittent low power after EGR cleaning:



I removed and cleaned the EGR. It wasn't very dirty, the piston seems to be free and actuate with me pushing on it with a wood wire brush (which i used a little to clean the housing).



I am going to order 5mm ID vacuum hoses now.
jimmy0000 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
2006 Jetta BRM ( Low Power , Black Smoke at Low RPM ) jwalkington VW MKV-A5 Golf/Jettas 12 July 29th, 2018 16:46
Low low end power until turbo kicks in and low again on highway. lirunaway VW MKIV-A4 TDIs (VE and PD) 9 February 28th, 2016 14:27
low power alh tdi. none of the normal issues but still low power Gerich@apex-tuning VW MKIV-A4 TDIs (VE and PD) 36 December 24th, 2015 21:44
low boost, low mpg, low power koabi VW MKIII-A3/B4 TDIs 19 November 23rd, 2007 14:45
Low power, Low MPG, Low Smoke oguzooz TDI 101 18 November 7th, 2007 21:03


All times are GMT -7. The time now is 22:32.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2020, 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 - 2020, All Rights Reserved
Page generated in 0.13173 seconds with 13 queries
[Output: 90.40 Kb. compressed to 77.55 Kb. by saving 12.84 Kb. (14.21%)]