HAMMA2712

I need a technical advice . My A4 2.0 2005 Has an red low oil pressure and coolant . By now i know that piston #2 is broke there's no pressure on it .
Couple people told me that it can be the valves or wrong timing chain . The thing is the car still runs shakes at first but once i hit 60-70 mph it runs ok . and there's no knocking so it can't be the valve right?
5 months ago i had my timing belt changed at a dealer , and this happened after 10k miles from that time . Is it possible that they did it wrong ?
I'm taking it in at the same dealer for a diagnostic and they said if it's because of the work they have done ,they will cover it .But i highly doubt they would claim responsibility .
what do you guys think it can be the reason specially there's no sounds or knocking in the Engine
Thank you

Prospeeder

If what your saying is what i think, no compression on cylinder 3 and low oil pressure. I would probably say the engines junk, maybe burnt a valve (they make no noise) Does it smoke like crazy? If not then its not the piston. Pulling the head off will make it obvious. If it has low oil pressure......i would pull the oil pan first and be sure the pickup tube is not blocked with junk, that rob bearings are good, before doing any head work. Probably be best to get another engine if the damage is to much....

Your post sounds like you havent checked much, your SURE it has no compression on that one cylinder? Not just the ignition coil is bad and fouled the plug and washed out the rings on that cylinder?? Check basic stuff first. Use only 5w40 synthetic, too thin of oil is not good for these engines. i see some oil change places using 0w-20 and 5w20 for some reason, waaaay to thin for these cars.

HAMMA2712

Thank you for your respond and Yes i checked and changed the oil .
I'm sure Piston 2 has no pressure . they gave me a 4k $ to fix it .
Can timing belt be a cause of any of this ?(burnt /broke valve)

HAMMA2712

And no it doesn't smoke at all ! just shakes like crazy but once i hit the gas it runs ok.
How much would a burned valve cost average ?

Prospeeder

Meh probably close to 2000-2500 to pull the head and re-valve it. if its got 0 compression, no smoking, than its most likley a burnt valve. Take the head off it will be obvious

HAMMA2712

Can a wrong timing job be the cause of that?

Prospeeder

noo it just happens, probably combination of poor machining at the factory, high combustion temps, ect.

HAMMA2712

thank you !