1994 Mercury Marquis Rear End Throbbing Noise

1994 MERCURY MARQUIS
110,000 MILES • V8 • 2WD • AUTOMATIC
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KIMMEL KING
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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???
Oct 25, 2009 at 7:07 PM
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SERVICE WRITER
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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.
Oct 25, 2009 at 7:50 PM