Well I am not used to any weird noises coming out of my engine other than the normal ones.
I have a 2002 WRX.
I was stopping at a light today and i dropped from about 3krpms to idle and i heard kind of a garbled screeching and my idle dropped real low then back up to 750. I pulled into a parking lot at a store i was going to and i was able to reproduce the squealing/screeching noise by revving lightly to 2-3krpms and letting off it would last about 1 second and stop once idle evened out.. It was not very loud, it was barely audible over my audio.
I went into the store i was at for about 10 mins, came back out and the sound was gone and im unable to recreate it. So my theories so far are a belt is loose and cold/warm weather is doings omething, or my blow off valve is sticking and causing some weird noises. The only reason i think the BOV could be the cause is because the sound i was hearing almost sounded like a belt, but it didnt, if that makes any sense. Anyone have any insight on this?
I have a Cobb Stage2, TurboXS RFL BOV, 3" turboback.
Yeah, im finally over the BOV and going back to stock this weekend, dont worry. But any help on what could be making that noise would be helpful, thanks.