All Things Mk5 > How to Guides / Troubleshooting

Cold start fault

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Richn83:
Wait till hte cold start sequence is completed before driving the car?  :grin:

For £30 it might be worth trying a replacement PCV as it might need sufficient pressure for it to demonstrate failure.  Also have you logged for faults with VCDS?

On another thread it was mentioned that there is a soelnoid that controls the cold strat sequence this is from memory but think it might have been '100' you could try removing that to confirm if its related to the start sequence or goes away once the car has been left to idle for awhile?  The thread was about cold starting and people noticig that the 1200rpm idle wasnt working in the cold weather.

jimmy-s3:
Listened to the car again tonight, the car has been stood all day. Drove it  whilst it was in the cold start 'mode' and the noise i can hear sounds to me like a turbo spooling over very slowly and very dry???

Richn83:
Well unless your gunning the engine from cold your turbo wont be spooling.  And if you are revving the t1t off it just after starting then its bound to drive like a dog as you wont have nice warm oil in and around your turbo.

Think you need to get it logged using VCDS for error codes and parameters when idling, and if there is a noise then a video of the start and the noise would help, if you cant do the above then I would suggest taking to a garage for diagnostic.

Boothy:
PCV ? :ashamed:

ub7rm:

--- Quote from: Richn83 on February 23, 2011, 01:42:59 pm ---Wait till hte cold start sequence is completed before driving the car?  :grin:

For £30 it might be worth trying a replacement PCV as it might need sufficient pressure for it to demonstrate failure.  Also have you logged for faults with VCDS?

On another thread it was mentioned that there is a soelnoid that controls the cold strat sequence this is from memory but think it might have been '100' you could try removing that to confirm if its related to the start sequence or goes away once the car has been left to idle for awhile?  The thread was about cold starting and people noticig that the 1200rpm idle wasnt working in the cold weather.



--- End quote ---

Can you remember anymore about this cold start solenoid?  I've tried a search for it but nothing comes up.  When the weather was colder the revs would drop down to 'normal' idle immediately whereas now (at the tropical temps of 5 deg c) it sits high for 20 seconds or so before dropping down.  This is what I would consider as normal and what it should be doing.  When it was colder the engine did need turning over more than usual as well.  Not sure if it could possibly be related but I'm sure my car is taking a good while longer to warm up than it used to too.

I have replaced the PCV, thermostat and temp sender to no avail.

The revs dropping down straight away is strange as I would expect it to rev higher, for longer the colder it is - not the other way round as it is at present.

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