Is the squeaking noise I'm hearing coming from the "idler pulley"?

Asked by Apr 28, 2014 at 03:35 PM about the 2003 BMW X5 4.4i AWD

Question type: Maintenance & Repair

I recently had a new alternator and brakes put on my 2003 BMW X5 (4.4i).  There is now a squealing sound that happens only when the car is in motion.  This issue presented after the alternator was installed.  I was told it was the brakes so I had them replaced but the noise still persists.  There are no lights or indicators of any low fluids or any other mechanical issue.

Could it be the idler pulley?  Would this have been damaged during the installation of the alternator?

2 Answers

17,145

noise that only happens when wheels are rolling should indicate the sqeak is related to the wheels turning, listen to see which side the sqeak is on and then jack up that wheel and turn it with your hands and that should help locate what is rubbing.

264,235

Best way to find out is remove the serpentine belt and spin the pulleys by hand. Are they free spinning and make noise? Then time for a new one, they usually need replacing around 80K. Check idler pulley, tensioner, etc. Inspect the belt while your in there too.

Your Answer

BMW X5 Experts

  • #1
    Tom Demyan
    Reputation
    1,860
  • #2
    Robert Charlson
    Reputation
    760
  • #3
    Asiamah6910
    Reputation
    660
View All

Related Models For Sale

Used BMW X3
271 Great Deals out of 9,367 listings starting at $2,648
Used BMW 5 Series
565 Great Deals out of 15,749 listings starting at $1,650
Used BMW 3 Series
1,159 Great Deals out of 32,871 listings starting at $1,200
Used Mercedes-Benz M-Class
344 Great Deals out of 6,307 listings starting at $1,800
Used Jeep Grand Cherokee
1,082 Great Deals out of 72,500 listings starting at $1,195
Used BMW 7 Series
120 Great Deals out of 5,193 listings starting at $1,750
Used Porsche Cayenne
111 Great Deals out of 5,108 listings starting at $4,900
Used Acura MDX
493 Great Deals out of 16,242 listings starting at $1,992
Used Land Rover Range Rover
66 Great Deals out of 4,264 listings starting at $4,500

Used Cars For Sale

2017 BMW X5 For Sale
49 Great Deals out of 1,707 listings starting at $43,988
2016 BMW X5 For Sale
12 Great Deals out of 331 listings starting at $31,900
2015 BMW X5 For Sale
78 Great Deals out of 1,616 listings starting at $25,990
2014 BMW X5 For Sale
49 Great Deals out of 883 listings starting at $22,889
2013 BMW X5 For Sale
41 Great Deals out of 687 listings starting at $13,799

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.