engine knocking

**a4jmac** · 05-30-2008 09:45 AM

hi, new poster here
about a month ago i purchased a 97 a4 1.8tq 5spd and recently ive been having some problems with it. i bought it knowing that the turbo seals were pretty much shot, so it was burning off tons of oil and i hate to say that i may have ran it kinda low on a few occasions. but about a week or so ago is when the real problems started
i had been driving it fairly hard for about 10 mins then stopped for a minute or so, then when i took off the engine started knocking horribly at idle. so i towed it to a friends house and took the head off bc the first thing i thought was bent valves since the motor is pretty much stock. but they appeared to be ok, so i put a new turbo in and new gaskets where they were necessary. got it all back together and it still knocks, but only over 1500 rpm, and the knock is coming roughly from around the oil pan. am i correct in thinking possibly spun bearing? i dont want to tear it all apart again for nothing. any help is much appreciated :)

**b5a4gt28** · 05-30-2008 12:59 PM

do you have the full amount of oil in the engine?

**a4jmac** · 05-30-2008 01:11 PM

yeah, after i put it back together i refilled it, let it cycle through, and double checked it

**Nebone** · 05-30-2008 01:25 PM

Bad connecting rod bearings. Bearing between crankshaft and connecting rod. Sound comes on after about 1500 rpm.

My friend with a VR6 had the same issue. New motor or replace bearings.

**Mawhitey** · 05-30-2008 01:51 PM

Big end bearings, mine welded to the crank when i lifted off after driving hard, Oil light came on and that was the end of the AEB

**loustylez** · 05-30-2008 02:12 PM

so you can't drive hard, stop, and then drive hard again in these cars? i guess just always drive hard and never stop is the key :)

**a4jmac** · 05-30-2008 02:16 PM

awesome thanks for the help. guess the bottom end's coming out after the top too. hopefully its not a disaster area in there...

**Mawhitey** · 05-30-2008 02:38 PM

Originally Posted by loustylez

so you can't drive hard, stop, and then drive hard again in these cars? i guess just always drive hard and never stop is the key :)

Well i think its a case of not ignoring the little noises, mine rattled, i just didnt get around to looking at it till i removed the engine when it was FUBARd,lmao