Rattling when giving gas and letting go of gas pedal

Tiny
TXSPECIAL
  • MEMBER
  • 2012 SUBARU LEGACY
  • 2.5L
  • 4 CYL
  • AWD
  • AUTOMATIC
  • 51,000 MILES
Have a 2012 subaru legacy and when I give gas I hear like a "bell" type sound. Like a "bell"or "rattle"type sound; It occurs mostly on speeds under 60 and mostly when you give it gas. If you quickly give gas and then let go you can hear it make the sound. I was told it probably was the belt tensioner, does this sound like good advice?
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Saturday, October 17th, 2015 AT 7:43 AM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
You may have a faulty knock sensor, this sensor monitors internal engine detonation and send a signal to the ecu to alter ignition timing, get a scan and check for as fault code, this often will not set a check light.
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Saturday, October 17th, 2015 AT 9:31 PM

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