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Old 10-05-2012, 02:30 AM   #1
NASIOC Supporter
Member#: 283134
Join Date: May 2011
Location: AZ
2015 STi LE
EFR7163 500whp/550wtq

Default Weird knocking sound

Car: 2008 STi, built block (CP pistons), every other bolt on imagineable

So, my car has driven perfectly the last 3k miles. I started hearing this knocking sound on Monday. Only driven it maybe 40 miles since then, but, it seems to be getting louder now. Car drives normal, acceleration is fine, idles perfectly.

However, tonight I pulled up to a light and the car died. I got a jump start, it started up and I was able to get to the next auto store and get a new battery. I put the new battery in and it couldn't start the car. Tow truck shows up, he jumps the car again. It'll run, but after a few seconds it'll die for no reason.

The knock is apparent after I let off the gas, usually only between 2200-4000rpm. Higher RPM I don't hear it. But, it's a loud sound, very obvious. If you let it idle, and lightly bring the RPMs up you'll hear it like in the video below.

I have a bad feeling about this one...but would love any thoughts on what it could be. The car was towed to a shop, and I forgot to check the oil before I dropped it off. I haven't had any oil consumption problems with the car, and it has been maybe 2000 miles since the last oil change, if that.

Video here: http://s1052.beta.photobucket.com/us...39a15.mp4.html

Last edited by pet3r; 10-05-2012 at 02:52 AM.
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