Headlight Cleaning Guru
Join Date: Jul 2002
Location: H-town, TX
cats causing this noise?
this week, my ds cat was rattling. it seems the catalyst material has come free and is making it rattle. a rubber mallet confirmed this.
today, it started making this loud hissing/wooshing noise, like a huge vacuum leak. it sounds like its coming from the firewall/under dash area. it got louder with more throttle. a member here says its my cat. im getting new cats irregardless.
do clogged cats cause this noise?
1990 300ZX TT