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Hard Starting in Winter

VW MKIV-A4 TDIs (VE and PD) - TDIClub Forums - forums.tdiclub.com
I know this has probably been rehashed several times, but I am having issues with starting my car this winter. When it is -20 the GP come on and stay on for ~20s and then go out. The car turns over and starts just fine. I drive ~40 miles to work and the coolant temp is normal at ~190( Vertical on my gauge). The trouble starts if I don't let the car sit for 6-8 hours or sometimes overnight, the car won't start. If I let it sit for 3 hours, the engine has cooled some, but when I turn the ignition, the GP light comes on and goes off in a second. When I crank the engine over, it will crank furiously and belch tons of white smoke, but not start. I then let it sit overnight and the GPs come one and everything is OK. I had my mechanic pull the CTS plug and the GP came on for 20 seconds and the car starts right up. I thought oh it must be a bad CTS, so I told him to change that out. He puts in a new CTS and hooks it up and the GP light comes on and goes off immediately when he turns the key. I am tired of getting hosed on part costs 3X what I can buy it for and >$100/hr in labor. I'm taking it to a different shop that specializes in VW/Audi Tuning and mods to hopefully get it fixed right, but I would like to learn for myself so I can do the diagnosis myself. I am currently running with the CTS unplugged with a CEL as expected. Thanks!

2003 VW Jetta TDI Wagon 5-spd ALH engine 252k miles

TB done twice last time at 229k new tb tensioner 3k ago previous one ate itself.

Intake manifold cleaned every 50k last done at 229k

New Turbo 3k ago.

New GPs 3k ago

New gp harness 100k ago

Original MAF
Date: Jan 29, 2013   



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