Poping noise under dash while driving

[FordSUV]

I heard my car had poping noise under dash while I driving. This noise is gone while the engine idle. Is there anybody has the same problem and how you fix it? Any input will be appreciated.

[gtodriverblake]

There are two potential popping noises you describe that I have experienced. Under the dash mine was the heater diverter door that was slamming shut. I'm not sure if the door operates with the vacuum system, but once I found my vacuum line disconnected at the front right wheel, and fixed it, the popping sound went away. This was purely coincidental because I was trying to find out why my auto hub lock feature didn't work.

The other popping noise was actually under the driver's floorboard. The front axle springs u bolts were VERY loose. Tightened those and that popping sound went away.

Good Luck!

[CHPMustang]

[ QUOTE ]
I heard my car had poping noise under dash while I driving. This noise is gone while the engine idle. Is there anybody has the same problem and how you fix it? Any input will be appreciated.

[/ QUOTE ]
In the past the blenddoor is little more noisy with the windows down while driving but that's not often.

[JADFPE]

Not uncommon.

Check the body mounts under the driver's seat/floor area.

Check the front sway bar mounts.

Hope this helps,
John

[JADFPE]

This was not by accident. The vacum source controls both functions. When the line was disconnected, little vacum was left for anything else.

John [img]/ubbthreads/images/graemlins/smile.gif[/img]