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2000 Golf TDI ALH Automatic - Cranking longer than usual

2115 Views 5 Replies 2 Participants Last post by  chittychittybangbang, 
I
I have been dealing with this issue for a while and am running out of options.

I think I have narrowed it down to coolant temp. sensor. Not that it's bad, because I have tried three new ones in the process, but that I will install a switch with a resistor that will 'fool' the ECU and increase the starting amount of fuel. I have come to this conclusion after I wasn't able to find any information on how to increase starting fuel quantity with VCDS and that if I disconnect the cable from the coolant temp. sensor, the car will fire right up but it will rev too high for a second.

Any advice on how to do this a more proper way (software adjustment) is appreciated. Also, if you have done something similar to the fix I described above, I would like to hear your input on the resistor type.

Thanks!

:panic:
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chittychittybangbang
You can adjust glow plug duration on the 2000 through VCDS adaptation. Try this: look at engine measuring blocks on a cold (overnight) engine. All sensor values should show ambient.
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chittychittybangbang
Well since you're in South florida, the GP should not make any difference since they don't run before engine start unless it's below a certain temp that south florida probably never sees. It could be some sensor problem, also check the fuel IQ (see the faq)
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chittychittybangbang
When was the timing belt last done? How is the injection pump timing? You can advance timing through VCDS, see the timing belt part 2 article. Have you checked the wiring to the coolant temp sensor?
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