Mk5 gti starting issue

[Clgale1988]

Hi guys i recently purchased a 55 plate mk5 golf gti now im getting some starting issues its alot worse if the car has been sat overnight or all day. But when you start the car it seems like it wants to cut out it splutters and the dar shakes abit and sounds like its going to die then after about 3 seconds it starts to run fine. The car does sometimes hunt slightly when on ideal but not always once it has been started drove turned off then started again it still does it but not as bad if you press throttle when start it kinda overides it abit. Any thoughts people

[Beej]

Seems to be a common issue the starting thing on some of our cars, but, supposedly, and as far as I know, no one has yet found a cause/cure

[r5gtt]

I had the same issue once but its totally cleared now on the gti 

Had it with my audi tt and when I replaced the crank sensor the problem disappeared for good. no eml fault codes nothing.

[Clgale1988]

I have no codes on dash or anything its really bad when start it after its been sat all night really want it sorted but no1 seems to know

[r5gtt]

The problem is no one will ever know as it doesn't register on vagcom either. I'd put my pennies on a crank sensor as most of the cars I've worked on with starting issues from cold have had failing or dirty crank sensors with lots of deposits stuck to the magnet causing starting issues which were resolved by either cleaning or replacing the sensor. Could also be heavily clogged up cylinder head or injectors. Vagcom can tell you if your injectors are faulty if you have one and know how to use it?.

[Clgale1988]

I dont have 1 but i know someone who does. If crank sensor was dodgy would it still do it when its warm as its not as bad starting it when warm but very slightly does it

[r5gtt]

Sorry does what, misfire?.

[Clgale1988]

Yea well stumbles and splutters abit when start dosnt do it as bad when its warm but its still there so would crank sensor still cause that

[r5gtt]

Definitely a possibility.

[Clgale1988]

Coilpacks wouldnt cause it no?

[r5gtt]

Plugs could also cause the problem if thr vehicle hasnt had a plug change for a few years so best check plugs and coils first if you haven't already done so.
Those are the basics tbh.

[Clgale1988]

Ok i will have a look got no record of plugs or coils been changed on it

[Clgale1988]

What spark plugs do they take?

[Beej]

I have changed plugs, coil packs, fuel filter, had inlet cleaned and runner flaps removed to see if it was any of them, nope no joy. Tried priming the lpfp a few times also, no joy.

I know what you are saying with regards to not doing it was it's been run. It will start perfect if it hasn't been sat for 7+ hours.

To me it seems like a fuel pressure dropping issue, since it's only really apparent after long stands

[Clgale1988]

Il start with the basics for me 1st iv not long brought it and its always been there so want it sorted its done 100k now and cant find nowhere says coils been done plugs been done etc