Rattle when under a load or going up hill

Tiny
WOOLLEY15
  • MEMBER
  • 2006 MITSUBISHI MONTERO
  • 3.8L
  • V6
  • RWD
  • AUTOMATIC
  • 96,700 MILES
When I accelerate or going up hill there is a rattle, it sound just like when the oil is low or old there is a tinging in the bottom end. But I just change the oil twice, first to factory spec, then to a heavier weight and when I changed to the heavier weight it went 75% away but I can still hear it. Any idea. Ty
Monday, May 11th, 2015 AT 4:43 PM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
Could be one of 2 things that come to mind. Firstly get the oil pressure tested with a mechanical gauge, report the findings at cold idle, hot idle and hot @1500RPM. Also you me be hearing what is called detonation or engine knock, to check this out get a scan done and see if a code is set for a faulty knock sensor, as the ignition timing is constantly adjusted by the ECU pending engine conditions, if the knock sensor has failed the timing will not be adjusted and engine ping or knock will be heard on acceleration.
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Tuesday, May 12th, 2015 AT 12:03 AM

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