2003 Subaru WRX, has a gutted downpipe, gutted up pipe, SPT intake, GMBCS and stock CBE. Was tuned a few summers ago by Nuke. No CELs, replaced spark plugs and did an oil change about a month ago. The sound started a week or so after replacing spark plugs. While in neutral the sound is audible from 1k - 2k, while in gear it's just barely audible while on throttle. Should I be preparing for a rebuild? Any help is appreciated.
Doesn't sound life threatening, just make sure it has fresh oil, something good like Rotella T6 10W-40 or so. Just stay away from Mobile 1... Stay away... I agree though, sounds like an exhaust leak.
Can't be an exhaust leak. I've had leaks before and they sounded much more tinny/metallic. Double check for any missing screws and ensure all engine compartment pieces are secured. Maybe a screw popped off and fell into a crevice above the engine or maybe a portion of the engine is vibrating against something. Not likely the culprit but worth a check.
Thanks for the input guys/gals(?). I always run Rotella 5w40 in my wrx. I haven't had a chance to check the spark plugs but when I installed them I checked, double checked, and triple checked to make sure that everything was tight. After reading a bit more it's probably safe to assume rod knock...and it literally sounds like a knock...lol NF Performance you may be getting some business soon for a rebuild.. Any other advice/opinions are welcome.
Spot on. Car is running 100% now, no rod knock, it was just a loose spark plug >< Mods feel free to close the thread.
