All Things Mk5 > How to Guides / Troubleshooting
Cold start fault
Richn83:
--- Quote from: ub7rm on February 23, 2011, 05:24:08 pm ---
--- 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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This thread http://www.mk5golfgti.co.uk/forum/index.php/topic,22317.0.html I never got to the bottom of whether it was an R32 part or TFSI but I guess it will have one regardless just might be a different number and placement.
jimmy-s3:
I never gun my car from cold, so its not as if the turbo is getting loads of stick?
The car has started hesitating in the high rev range again tonight ?
Does anyone know what the part is under the fuel pump with the rod/arm which i pressume opens and closes something??
jimmy-s3:
Im reading that the 'tumble flap' fails on the 2.0 tfsi. What does this control and would it be relevant to my problems?
jimmy-s3:
Had my car checked over on VAGCOM at the weekend and only came up with one fault..
01809 actuator motor temperature flap!
Anyone know if that could be related to my cold start fault?
Richn83:
http://wiki.ross-tech.com/wiki/index.php/01809
It looks like its related to the aircon system rather than anything engine related.
By the way earlier on I wasnt suggesting you were gunning it from cold, just you had trouble driving off from a cold start situation.
The tumble flaps adjust/block off the air flow into the cylinders at low engine speeds to help keep a correct air to fuel ratio. They certainly could affect pull off from cold start if they were sticking open.
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