I have a 1994 D90 that is putting out a loud howling ( almost train whistle) sound. The noise or howl gets louder as the engine warms up. With the hood up, the sound sounds like its coming from the air filter chamber. I also noticed while outside with the engine running that the howl can be heard coming from the exhaust tailpipe as well. This all started about 2 months ago.
Anyone know of a fix for this ... its very annoying!
Anyone know of a fix for this ... its very annoying!
