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2005 chevy trailblazer_lt_ext
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Discussion Starter · #1 · (Edited)
Hi, I have the long discussed vibration at idle & can't get rid of it.. also some loud engine noise. This is currently May 2021.

2005 TB EXL 2WD

  • 40k miles - kept in Florida - looks truly amazing & would seem a shame to sell it.
  • Vibrates at idle speed 600-700rpm - sometimes dips lower when warm sitting at a stoplight, then really vibrates.
  • Loud engine noise from under hood when under load (for example towing trailer & accelerating at 4000-4500rpm)
  • Motor mounts were changed 2x (1st in Nov 2020, then in April 2021) were OEM ACDelco & in a month or weeks in each case vibration was back.
  • FWIW- Exhaust manifold & one of the 02 sensors was changed about a year before.
  • just cleaned throttle body April 2021 also

- I took a slo-mo of the fan & belts -

PLAY at 1080p + full screen, & use slo-mo for best sharpness

SEE fan blade wobble - AND tensioner pulley going up & down..
are either of those enough to cause vibration - anything else you see?

What else can/should I try? THANKS VERY MUCH !!
 

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The tensioner motion is normal even at slo-mo.

The fan is plastic and its motion is also normal.

Look elsewhere.
 
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