[Vwdiesel] UPDATE: Dying Glow Plug Relays???

[Val Christian]

I'm struggling with a different problem.  I had one GP go bad, under 
warranty.  So they replaced it.  You'll know when a plug goes bad, because
the computer senses the current differential between 1&2 and 3&4.  
The problem with the setup is that the computer polls the GP harness,
and if you have a transient or intermittent condition, it may trip
things.

The problem I'm working is that the car will not start at temps between
45F and 80F, without several seconds of cranking.  The manual says that
there's no glow power applied at those temps.  Intuition tells me 
that they really apply 3 seconds or so of power.  And because I'm not
getting that, I'll wear out my starter sooner.  (If anyone can 
measure theirs, I'd appreciate it.  I don't have access to a second TDI.)

At 0F, or even 32F, the car starts just fine.  And when the engine is 
hot it will start fine.  Go figure.

Val








> 
> Hi all!
> 
> Quick update....  The wiring and glow plugs for
> mismatch/bad connections were OK. Checked for voltages
> at the relay. Nothing found.
> 
> Then I tried VAG-COM in the "output test" mode. The
> test mode made the "bad" glow plug relay open and close
> several times, with nice loud clicks.  The overhead
> light even dimmed!
> 
> The only trouble code I have gotten on Vag-Com is
> "glow plug relay/glow plug intermittent".  But there
> must be something else going on, because the glow
> plug system seems workable......
> 
> Where would I look next?  It seems like there should
> be some other trouble codes, but there aren't any....
> 
> Thanks to everyone who wrote back!
> 
> Paul
> 
> 
> -- 
> *********************************************
> Paul Reich                Electrical Engineer
> 
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