Odd noise from front left....

C

CRGILL

Had this noise for several months & damned if I can find any cause for it.

Happens when the vehicle is cold & is a fairly loud whap, whap, whap sound,
seeming to come from under the hood right in front of the driver, which varies
with road speed up to around 40mph when it stops. Drop below 40 & it comes
back. Goes away as the vehicle warms up. Is not affected by applying the
brakes. I've had the wheel off & checked the brakes, the driveshaft boots,
felt around the wheel to see if there's anything rubbing, but so far nothing.
Any ideas?

Chris
 
Does it vary with road speed or engine speed/rpm?
For road speed I'm gonna guess here.....could be a flat spot on the left
front tire.
RPM/engine speed is most likely a belt
Both are rubber, both will be hard in cold weather and as the vehicle warms
up, the rubber does as well, resutling in a softening and the noise goes
away. When still cold after 40 mph the frequency is so rapid that it
actually disapates.
 
Had this noise for several months & damned if I can find any cause for it.

Happens when the vehicle is cold & is a fairly loud whap, whap, whap sound,
seeming to come from under the hood right in front of the driver, which varies
with road speed up to around 40mph when it stops. Drop below 40 & it comes
back. Goes away as the vehicle warms up. Is not affected by applying the
brakes. I've had the wheel off & checked the brakes, the driveshaft boots,
felt around the wheel to see if there's anything rubbing, but so far nothing.
Any ideas?

Check if the rotors touch the disc covers at one point during a full rotation.
This can occur when the rotors are taken off and put back on with some rust/
debris trapped underneath.

florian
 
The point about engine vs road speed applies. If engine rpm -
Very likely failing timing belt tensioner or piston slap. Inspecting
inside the TB cover for an abraded spot will be diagnostic for the TB.
Also, could very well be piston slap - notorious in some soob engines
and will definitely subside as engine warms up. Do a search for these
issues on the forums at www.usmb.net

Um - did we miss what vehicle, model year, mileage etc.?

Carl
1 Lucky Texan
 
Could be the CV joint; they do funny things with sound sometimes
- how many miles are on them?
~ Paul
aka "Tha Driver"
 

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