1994 Mercury Marquis Rear End Throbbing Noise

Tiny
KIMMEL KING
  • MEMBER
  • 1994 MERCURY MARQUIS
  • V8
  • 2WD
  • AUTOMATIC
  • 110,000 MILES
Getting a rear end throbbing noise (like running over rumble strips) intermittently around 30 - 50 mph. Also a intermittent high pitched whistle from the engine. Not sure symptoms are related as just bought car used. When throbbing noise occurs in rear end the car engine has a hesitation. Could the abs be engaging one of the rear brake drums? Some recall wit the speed sensor/cruise control? Thought the high whistle might be the serpentine belt on a stuck pulley or an about to die water pump bearing or some air mass/vacuum leak. Just guessing stupidly as you can tell. Love the car and all else works great. What to do?
Sunday, October 25th, 2009 AT 7:07 PM

1 Reply

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
The thing I would do first on this, and hopefully last.
Is to drain trans and torque converter, clean out cooler and lines. Fill with Mercon V or equivalent.

Look for a vacuum leak and check the pcv valve regarding the whistle.
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Sunday, October 25th, 2009 AT 7:50 PM

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