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

Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW B5 Passat TDIs

VW B5 Passat TDIs This is a general discussion about B5 Passat(>98 (2004-2005 in North America)). Non TDI related postings will be moved or removed.

Thread Tools
Old January 3rd, 2018, 04:57   #16
Certified Volkswagen Nut Vendor
oilhammer's Avatar
Join Date: Dec 2001
Location: St Louis
Fuel Economy: fantastic

And we have had several of the middle revision BHW cars that simply refused to start in the cold, sometimes not even *that* cold, like 25 F. VAG missed the ball on that one. Rocketchip had no issue making them start with the 5V Bosch plugs though. Mine has that combo right now.
Pretty sad that a fellow in PA can make Volkswagen's diesels start better in the cold that Volkswagen can.
oilhammer is offline   Reply With Quote
Old January 3rd, 2018, 14:40   #17
Veteran Member
Join Date: Sep 2005
Location: Alaska
Fuel Economy: 43.5/32/28

Ours would originally start at -20 fine.

I seldom started it cold though, at least used the oil pan heater.

Its slowly gotten less happy, 0 is about the limit now.

New battery made no difference.

I have lost count of how many times they replaced the glow plugs.

First time I had to force them, they got it when they pulled out the original ceramic GPs and one was almost burned in half.

Then each time it was in after that they did it again! Had no records of it being done.

I have a battery heater as well as the Circulation Heater (that is a wonder) and no issues.

No Vagcom (yet)
2005 Passat TDI Wagon
Smokerr is offline   Reply With Quote
Old January 3rd, 2018, 17:01   #18
Veteran Member
Join Date: Apr 2001
Location: Southeast Texas
Fuel Economy: 37 MPG (~ 45% city)

Correct with the explanation below QuickTD. I had to ship my ECU to TD Tuning to do the re-programming, including the processor flash. Robby installed the ceramic NGK glow plugs and he did a great job with installing the manual transmission. Everything works like OEM (gain about 15% in MPG average), no engine lights. If I find somebody in the Houston area with a VCDS I will look for the ECU part number to verify as you state below.

The battery is fairly new, two year old, group size H7, AGM with the required electrical specs for the B5.5 TDI. There are of course other variables such as an ageing starter, etc. But the fact that cycling the glow plugs so many times 'fixed' the cold starting tells me I need to look more in that area perhaps.

Thanks for all your contributions to this thread 👍

Originally Posted by QuickTD View Post
Pretty easy to check if you have the
correct software for the NGK's. Scan the ECU with VCDS and look at the ECU part number. The last digit indicates the revision level which, in the case of the Passat, indicates glow plug type.
Part numbers ending in "T" are for the newest NGK ceramics. "N" ECU's use the 5V steel bosch plugs that don't work very well and "R" is tuned for the original bosch 7V ceramics.
To switch glow plug types it is necessary to change the processor flash as well as the data. This normally requires bench flashing the ECU. The processor flash can't be changed via OBD2, except at a dealer. They have secret tools...
tikal is offline   Reply With Quote
Old January 3rd, 2018, 20:02   #19
Veteran Member

If you find someone to scan the car with VCDS, have a look at torsion value as well.

Cam timing can have a significant effect on starting as injector cam lobe position dictates the available injection pressure at start of injection. Badly retarded cam timing will make the car harder to start. If you find torsion value lower than -1 I would bump it up to 0 or 1 and see if it makes a difference.
QuickTD is offline   Reply With Quote

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 Weather= No headlights, Heater Fan, Glow plugs, Seat Heaters... travist185 VW MKIV-A4 TDIs (VE and PD) 9 February 3rd, 2016 13:59
06 jetta tdi wont start when cold, glow plugs cycle normal, and no smoke. Luskavarna VW MKV-A5 Golf/Jettas 12 December 11th, 2011 19:24
Starting in cold weather & glow plugs Nicklstdi TDI 101 6 June 16th, 2011 15:40
Cycling the Glow plugs in cold weather Marit TDI 101 22 December 23rd, 2004 14:24
Cold weather&glow plugs only light for 1 second!! FL60cummins VW MKIV-A4 TDIs (VE and PD) 18 December 14th, 2000 15:21

All times are GMT -7. The time now is 03:06.

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 0.13221 seconds with 12 queries
[Output: 67.14 Kb. compressed to 60.48 Kb. by saving 6.66 Kb. (9.92%)]