View Full Version : Hissing/Vaccuum Noise?

11-19-2003, 08:51 PM
I have a '99 Cobra with 12K on it. The only mod I know of is a drop-in K&N. I hear a hissing/vaccuum noise when just off idle and sometimes at low RPM's. Is this due to the K&N, something else, or is this normal? Thanks for any help or ideas.

11-20-2003, 01:15 PM
Um.... I can't remember but pick up the hood and check by the firewall. I think the problem lies there but I don't remember what was causing it. Maybe Tom can jump in here and remember. The K&N will not cause the noise you are describing.;)

11-20-2003, 06:31 PM
I don't know if it is related or not, but there also seems to be a "dead" spot just after shifting too. It's not real bad, but still noticable at times.

11-21-2003, 03:42 PM
Sounds like your traction control is engaging. Do you turn it off when you get in the car?


11-22-2003, 04:32 PM
Yep, I always turn it off.

12-23-2003, 12:43 PM
The dead spot was corrected by changing the fuel filter - FYI...