smoking on idle when hot ??

[madhead1987]

hi all im new to this forum and was wondering if anybody could enlghten me on what my problem may be ?
basically when the egines hot and left to idle for 2 mins it starts to smoke badly, 1st thing i thought was its the turbo, so i got a bargain om a ko3s £60 which turned out to be duff, but hey £60 not bad, any way i then rebuilt the turbo new bearing etc, still smoking so i then purchased a catch can to see if that would help ,still no joy any ideas anybody beacuse its doing my f**king head in

thanks to any one who replys in advance

[richw911]

Valve stem seals?

[Chris#101]

Valve stem seals?

+1 would deffinitely be the next call!

Isnt it funny theres been about 5 or so topics recently within the last month from different people with the same problem 

[richw911]

Valve stem seals?

+1 would deffinitely be the next call!

Isnt it funny theres been about 5 or so topics recently within the last month from different people with the same problem 

Yeah I noticed this 



OP -Assuming you have the correct grade of oil and its not over filled?

[madhead1987]

thanks is it a common thing to happen , i have quantum 10/40 is that right and is filled right to the mark

[daz veedub]

oil info 
http://www.golfgtiforum.co.uk/index.php?topic=95412.0

wouldnt it be smokey from start up if valve stem seals 

[Toby]

Cracks on turbo??

Ht = cracks get bigger

[rockmonkey69]

Cracks on turbo??

Ht = cracks get bigger

Not unless you mean the core is cracked but then you would know about it! smoking will be the least of your worries thats for sure! 

Can't say based on the limited information provided, what colour is the smoke? Where is it coming from? Breathers? Exhaust? You said you have a catch tank fitted, did you check none of the pcv hoses were blocked? (a blocked breather, or incorrectly routed breather setup will cause smoke out your exhaust) does the smoke go away when you drive off? Does it persist? Does it get worse on boost?

Alot of valve stem seals wear out, it's not a VW thing or a golf thing, it's an age thing as the material goes through expansion and contraction it begins to become brittle and fails to form a tight seal. Given the golf mk4 platform is over 10 years old now it's not surprising. Quite a few Honda engines suffer from this but some of their engines are bomb proof. Forum members will be able to better assist you when you get back to us with the above.

[dan2252]

my mk4 started smoking i was running on 530 fully was burning over a litre a week changed to 1040 part and it smokes if you rev it fairly hard from cold but of coruse you shouldnt be reving it hard when cold anyways but is yours burning alot of oil? whats milage like?

[madhead1987]

Hi sorry it's took a while to get bk to your comments it's seems to b more white than blue and it goes when driving car has done 112k services upto date , think I've done the catch can right I followed a guide on here I believe , the smoke itself comes from the back when it does smoke a blip of the throttle a bit more comes out then it clears hope this helps

I did check ye turbo for cracks and etc when I rebuilt it violent level not dropping neither oil level