Touareg: 2013 V6 TDI
Join Date: Nov 2014
Location: Winnipeg, Canada
Second Vehicle: VW 2
Thanked 54 Times in 52 Posts
Help diagnose slow starting - V6 TDI
2010 TDI 140000km
This is my second winter with the Touareg. Last winter I noticed as the temperature got colder, the engine would crank slower than normal. During the cranking, the backlighting behind the HVAC temperature displays would flash. I installed a brand new battery and the voltmeter shows 14V when running. The new battery made really no difference (except to my wallet).
Over the past summer, the warm weather cranking even seemed to be a bit slow - with the flashing backlighting. Now that it is cold out again, it is cranking even slower than last winter. This morning the ambient temperature was -32°C and it took about 10 seconds of really slow cranking before the engine fired. The 1000W circulating heater was plugged in for about 3 hours before starting. I notice even at -10°C the cranking is slower than at any temperature last winter.
Is this a symptom of my starter going bad? Failing battery to starter cable? The only code on VAGCOM is a NOX sensor. I will hook up my multimeter to determine battery voltage at the various stages of starting. If I turn on the ignition without starting it, the voltmeter seems to read below 12V (because of the glow plugs I believe).
I've started other Touareg TDIs in the cold and they crank full speed and fire right up. Any suggestions of what to look at?
I miss the 24V starter in my old LandCruiser! (12V truck, 24V starter)
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