Ha ha ok,

I would be inclined to agree with allytech, the reason the oil is in the air filter box is because the compression is blowing past the piston rings.

yes i know, but i have clean spark plugs!

so its not the case.

its just clogged crankcase breather with oil separator, which is common problem or VW 1.4 8-16 valve engines.

look here:

http://golf3-club.ru/forum/index.php?s=&showtopic=271&view=findpost&p=52771

its not english speaking forum but there are pictures that will show you what exactly i am talking about

hi again

ive just got the seals for oil separator but still havent cleaned it

but today i did the compression test at some local garage service

1 - 12,5

2 - 14,5

3 - 14

4 - 12

elsa tells that new engine is 10-15, minimum is 7 and max difference between cylinders is 3.

well i dont know exactly is my compression is good, but i think its not that bad to pink like an old cart.

any thoughts?

Those compression figures are fine mate. Has the knock sensor and timing been checked? (Haven't had time to read the previous posts.)

well, i have vagcom and i diagnosted the knock sensor group and it seems fine. the ignition altering 0 at idle and when it pinks it can get up to 10 degrees (14 is max available) or more i dont know, havent time to test and patience when it pinks. and in group 26 there are voltages of knock sensor to each cylinders and they are 0.3V +-0.1V for each cylinder in idle, which is normal. so i suppose the knock sensor is fine.

about ingition - what exactly do you mean? igintion angle in this engine is automatic. i have changed all spark plugs three times (original, NGK, now running on finwhale), measured the resistance of the ignition wires with caps:

longest - 6.25Kom

shorter - 6Kom

more shorter - 5.9Kom

shortest - 6.08Kom

and it seems fine

someone suggested me that timing belts wasnt set right. timing belts and rollers was changed only once on this car and the pinking was before i changed it. the service man said that he set marks correctly as it was, but maybe i need to double check it with some other service man or by myself?

but lets imagine that one teeth is incorrect, what will be the compression readings then?

If the car has been run on crap fuel for a long time then there could be excess carbon build up on the pistons and cylinder head which would have the effect of raising the compression ratio. It's already quite high, so wouldn't need much more to increase the pinking. I would also think that 10 degrees of advance is a bit too much at low revs, so maybe a problem with the mapping of the ECU? Don't know if they can be remapped.

mine ecu is original. so your guess is 2 and 3 cylinders have more carbon crap there?

wynns combustion chamber cleaning will cure the problem? what about the catalytic convertor and lambda's? they are very expensive if they will die :(

The ECU would make no difference to carbon build up on different cylinders. The only way to check is to remove the cylinder head or put an endescope into the cylinders through the spark plug hole. I don't have much faith in 'miracle' engine cleaners.

You need to do the compression test cold (as in first thing in the morning before its been run) and then hot afterwards you ll seee the problem then, i m sorry you dont want to hear it, it is a mega common problem and you have all the symptoms : (