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 > TDI Model Specific Discussions Areas > VW MKV-A5 Golf/Jettas

VW MKV-A5 Golf/Jettas Discussions area for A5/MkV Jetta/Golf (2005/2006 PD and 2009 CR).

Reply
 
Thread Tools
Old February 10th, 2019, 18:46   #1
foliva
Member
 
Join Date: May 2014
Location: Mexico
Fuel Economy: 6.1 lt/100 km; 40 mpg
Unhappy Cold start issue

Hi, did a search but couldn't find much. I've noticed (pls click here for video) that as of recently my MKV PD 1.9 Jetta 2007 TDI engine has been requiring more cranking to start when cold. When the engine is warm, there's no issue whatsoever; the colder, the worse.

The battery is relatively new (18 months since I replaced it), so I don't think that's the issue. I plugged in a VCDS-like cable and noticed one of the spark plugs is throwing a generic error; from another post, I was left with the understanding that even with one spark plug working, starting the engine should not be an issue.

Thank you for your input.
foliva is offline   Reply With Quote
Old February 10th, 2019, 21:15   #2
kdawg89
Veteran Member
 
Join Date: Dec 2013
Location: Spanish Fork, UT
Default

You havenít got any spark plugs. Youíve got glow plugs, how cold is the temp outside when it is slow to start?


Sent from my iPhone using Tapatalk
__________________
15 Golf TDI SEL DSG, Kerma TDI Tunes

Sold:06 Jetta, Darkside GTB1749V turbo, stage 4 malone tuning, 3 bar map, EGR delete, ASV deleted, buzzken catless downpipe, IDParts billet cam
kdawg89 is offline   Reply With Quote
Old February 10th, 2019, 21:58   #3
foliva
Member
 
Join Date: May 2014
Location: Mexico
Fuel Economy: 6.1 lt/100 km; 40 mpg
Default

Quote:
Originally Posted by kdawg89 View Post
You havenít got any spark plugs. Youíve got glow plugs
I meant glow plugs
Quote:
Originally Posted by kdawg89 View Post
how cold is the temp outside when it is slow to start?
Not that cold really: 10įC/50įF. Issue happens whenever the engine is NOT warm (p.e, after having the car sitting at the office parking lot before heading back home). When the engine is warm, it turns on just fine.
foliva is offline   Reply With Quote
Old February 10th, 2019, 22:12   #4
kdawg89
Veteran Member
 
Join Date: Dec 2013
Location: Spanish Fork, UT
Default Cold start issue

Does it run and drive well once itís running?

I canít imagine 1 failed glow plug causing that issue at 50 degrees but maybe if none of the glow plugs are working due to a relay or something.

If it starts great when itís warm it very well could be glow plug related especially since you have a code for something glow plug related.

I canít think of anything else that would cause that hard of a cold start but then allow the car to drive fine.

What if you shut the car off after say 10 seconds and try to restart? The fuel system could lose its prime after sitting for awhile which would make it seem like a it is because the engine is cold but is actually a function of time sitting for it to depressurize, I think there might be a check valve that keeps it pressurized.




Edit: see post 11 here. http://forums.tdiclub.com/showthread.php?t=320716

The check valve is in the tandem pump but some people just put an in line check valve in to should having to replace the tandem pump.
__________________
15 Golf TDI SEL DSG, Kerma TDI Tunes

Sold:06 Jetta, Darkside GTB1749V turbo, stage 4 malone tuning, 3 bar map, EGR delete, ASV deleted, buzzken catless downpipe, IDParts billet cam

Last edited by kdawg89; February 10th, 2019 at 22:18.
kdawg89 is offline   Reply With Quote
Old February 17th, 2019, 15:29   #5
foliva
Member
 
Join Date: May 2014
Location: Mexico
Fuel Economy: 6.1 lt/100 km; 40 mpg
Red face Found the problem...

Quote:
Originally Posted by kdawg89 View Post
I canít think of anything else that would cause that hard of a cold start but then allow the car to drive fine.
Found the issue: need to replace the harness.
Connected a VCDS cable and this error code came up:

On inspecting the glow plugs, not only noticed the harness is in really bad shape, I did confirm that indeed the connector to one of the glow plugs was broken.


Will buy one and will report back in a few weeks from now. Hope this fix the issue.
foliva is offline   Reply With Quote
Old February 20th, 2019, 02:26   #6
k_pt
Veteran Member
 
k_pt's Avatar
 
Join Date: Oct 2017
Location: pt
TDI(s): VW MKIV TDI
Default

Quote:
Originally Posted by foliva View Post
I meant glow plugs
Not that cold really: 10įC/50įF. Issue happens whenever the engine is NOT warm (p.e, after having the car sitting at the office parking lot before heading back home). When the engine is warm, it turns on just fine.
10įC is not that cold for a PD.

Check out the glow plug time on our engines:



Possibles reasons, ECT is throwing a value a lot higher than ambient temperature, losing fuel overnight on the head/injectors/tandem pump, low compression.
__________________
Follow me on some mechanics works https://www.instagram.com/kptgarage1986/
k_pt is offline   Reply With Quote
Old February 20th, 2019, 06:15   #7
atikovi
Veteran Member
 
Join Date: Jun 2002
Location: Suburban Washington DC
Default

Quote:
Originally Posted by k_pt View Post
10įC is not that cold for a PD.
Check out the glow plug time on our engines:
What is that chart even showing? What does air presure have to do with glow time? It was in the mid 20F's the last few days and 2 or 3 seconds is all mine needed to start.
atikovi is offline   Reply With Quote
Old February 20th, 2019, 06:58   #8
k_pt
Veteran Member
 
k_pt's Avatar
 
Join Date: Oct 2017
Location: pt
TDI(s): VW MKIV TDI
Default

Quote:
Originally Posted by atikovi View Post
What is that chart even showing? What does air presure have to do with glow time? It was in the mid 20F's the last few days and 2 or 3 seconds is all mine needed to start.
Atm pressure.
__________________
Follow me on some mechanics works https://www.instagram.com/kptgarage1986/
k_pt is offline   Reply With Quote
Old March 3rd, 2019, 16:03   #9
foliva
Member
 
Join Date: May 2014
Location: Mexico
Fuel Economy: 6.1 lt/100 km; 40 mpg
Unhappy replaced glow plug harness and check plugs... little to no improvement

Quote:
Originally Posted by foliva View Post
Found the issue: need to replace the harness.
Will buy one and will report back in a few weeks from now. Hope this fix the issue.
Quick update: had the harness replaced with a new one (USD 80 parts and labor). The error is gone but unfortunately little to no improvement (click here for the video of morning start day after I had the glow plug harness replaced).

I checked the plugs with a multimeter at the lowest resistance setting (200) and all four consistently read 1.3. So I guess the plugs are not the issue.
Scratching my head here...
foliva is offline   Reply With Quote
Old March 3rd, 2019, 16:07   #10
foliva
Member
 
Join Date: May 2014
Location: Mexico
Fuel Economy: 6.1 lt/100 km; 40 mpg
Question

Quote:
Originally Posted by k_pt View Post
10įC is not that cold for a PD.
Check out the glow plug time on our engines
Thanks... how would I need to go about doing this?
foliva is offline   Reply With Quote
Old March 4th, 2019, 00:15   #11
tdiman
Veteran Member
 
tdiman's Avatar
 
Join Date: Jul 2000
Location: bridgeport wv
Default

Had the same issue itís a crank shaft Position sensor have them check that


Sent from my iPhone using Tapatalk
tdiman is offline   Reply With Quote
Old March 4th, 2019, 05:13   #12
bbexotics
Veteran Member
 
Join Date: Oct 2012
Location: albuquerque
Fuel Economy: 51mpgs in 96 passat,41mpg in 2004 passat,42mpg in 2006 jetta
Default

Change fuel filter
bbexotics is offline   Reply With Quote
Old March 4th, 2019, 08:18   #13
foliva
Member
 
Join Date: May 2014
Location: Mexico
Fuel Economy: 6.1 lt/100 km; 40 mpg
Question

Quote:
Originally Posted by tdiman View Post
Had the same issue itís a crank shaft Position sensor have them check that


Sent from my iPhone using Tapatalk
Thanks... where you getting an error code associated to the crank shaft position sensor? Because in my case the only error I had was related to the open/broken glow plug harness connector (which is now gone).
foliva is offline   Reply With Quote
Old March 4th, 2019, 08:23   #14
foliva
Member
 
Join Date: May 2014
Location: Mexico
Fuel Economy: 6.1 lt/100 km; 40 mpg
Question Fuel filter?

Quote:
Originally Posted by bbexotics View Post
Change fuel filter
Thanks... is there any way to check if the filter is the issue without having to replace it? Perhaps if I have it cleaned somehow?

The car has on the odometer 174k kms (108k mi) and I had it replaced at 150k (93k mi); I'd image it'd still have some life in it?
foliva is offline   Reply With Quote
Old March 4th, 2019, 09:23   #15
MrBigTruck
Veteran Member
 
Join Date: Aug 2009
Location: Kansas, USA
Default

I had one of my 2 BRM Jettas cranking forever to start and I replaced the glow plug harness, injector wiring harness (under the cam cover), in-tank lift pump and the tandem pump. I also replaced a few of the shorter fuel lines because they were old and cracked (I made my own lines). It will start on the first half crank now even when it is zero Fahrenheit. My other Jetta starts on the first half crank as well. Your fuel filter should be good for 20,000 miles unless you got a tank of bad fuel that clogged it.
MrBigTruck 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
cold start issue weaverracing TDI 101 20 April 9th, 2013 21:28
Cold Start Issue. microsoot VW MKIV-A4 TDIs (VE and PD) 20 January 28th, 2013 13:35
Cold Start issue steffen707 TDI 101 0 November 5th, 2012 10:27
Cold start issue nokivasara VW MKIV-A4 TDIs (VE and PD) 4 November 23rd, 2008 06:15
Cold start issue with 17656 - Start of Injection Timing Regulation: Control Deviation greg123 TDI 101 3 July 19th, 2007 15:39


All times are GMT -7. The time now is 02:42.


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 0.16513 seconds with 13 queries
[Output: 128.37 Kb. compressed to 107.51 Kb. by saving 20.86 Kb. (16.25%)]