When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
So here is the problem; there is this odd buzzing noise seemingly comming from under the dash of my girlfriedns f150. this buzzing seems to only occur under the following two conditions. 1. the truck is going faster than 35 mph.
2. the truck hasn't reached operating temperature. Once the temp guage gets to normal, the noise will not come back. also if you decelerate below 30 and keep it under 30 the sound stays gone. Any ideas what might be causing this noise and why it is these two variables that cause it to occur? thanks for any help as this has me completely bumfuzzled.
Vacuum hose leak.
Vacuum varies with throttle plate opening and hose can change with temperature.
Look at the vacuum hose circuits associated with your control panel for air direction control.
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.