[Vwdiesel] TDI Starting Poor
val at swamps.roc.ny.us
Sat Apr 30 17:34:58 EDT 2005
Each glowplug draws similar power, and gets power. Measured with
Hall Effect DC current probe.
Loren mentioned intake blockage. I'll check that; I haven't yet.
Why would the intake change starting performance in a narrow temperature
range? Or is it simething you've seen before?
> May have been checked already but, how about the fuse for the glowplug?
> Val Christian wrote:
> > 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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