[Vwdiesel] TDI Starting Poor

[Val Christian]

I did check the sensor, using a radiometer, and they both agree within
2C, using several points.

One new thing I found, is that the ECN does not order preglow when the
coolant temp is above +5C.

Interesting.  I don't think I'm looking at low compression or other 
old age problems.

Val


> 
> I would check the coolant temp sensor for linearity, or is the coolant temp
> taken off of Vag-Com?
> Also connector corrosion, etc..
> 
> -james
> 
> -----Original Message-----
> From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com]On
> Behalf Of Val Christian
> Sent: Saturday, April 30, 2005 11:05 AM
> To: vwdiesel at vwfans.com
> Subject: [Vwdiesel] TDI Starting Poor
> 
> 
> It's finally getting warmer, and my TDI is starting poorer.
> 
> Symptoms:  Coolant temp between 5 and 15C, and engine may take 20 seconds
> of crank to get going.  Coolant temp below -8C, and engine starts with a
> tap of the starter.
> 
> Coolant temps are using VAG-COM, and correspond to the outside air
> temperture (OAT).
> 
> When engine is warm, or OAT above 20C, start is after a rotation or two
> of the engine.
> 
> Theory: A short glow isn't happening at initial start in these temps.
> 
> Assumption: Sensor indicated by VAG-COM drives glow time.  In this temp
> band, there is 0.0 preglow indicated by VAG-COM
> 
> Questions:
> 
> 1. Can the user tweak the preglow cooeficients using VAG-COM?
> 
> 2. Other problems or issues I should be chasing?
> 
> Val
> 
> 
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