Victor Perkins
New Member
- Joined
- May 23, 2019
- Messages
- 4
- Reaction score
- 0
- City, State
- Carmichael, California
- Year, Model & Trim Level
- 1998 Explorer Sport
I have a 98 explorer sport 4.0 ohv manual transmission. Between about 1500 rpm - 2000 rpm, I get this annoying rather loud vacuum type howling coming from the air box. Doesn’t matter if I’m stopped or driving, it comes on about 1500 rpm and keeps howling up to 2000 rpm. When I come up to a stop light the rpm’s come down slowly from 2000-1500 and rests around 1000. I have changed the air filter (K&N cold air kit), mass air flow sensor, throttle body (from original to KBB)-nothing seems to stop it. Any ideas?