Rumbling noise at high speed (not constant) - JeepForum.com
 
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post #1 of 2 Old 11-10-2015, 08:14 PM Thread Starter
TauntaunTrainer
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Rumbling noise at high speed (not constant)

Hi. I have a '97 Grand Cherokee Laredo that has about 230,000 miles on it. Over the last couple weeks it has been making a rumbling/vibration, most often when I'm driving over 60mph. The speed at which the noise occurs (usually between 60-75) seems to be tied to the RPMs. If the noise is at 60, the rpm is around 1800. At 65, 1900-2000. At 70, it's closer to 2100, and so on. Each speed has it's own specific rpm at which the noise occurs. Higher speed = higher rpm.
It ONLY happens when those two factors line up PLUS a light acceleration at the pedal. If I let off the pedal, the noise stops. If I floor the pedal, the noise stops. If I am cruising at the right speed and rpm but not using the pedal, no noise. If I know that the car is cruising just below the magic rumbling trifecta, I can floor the pedal to accelerate and essentially "skip over" the noise.
Just to clarify, this is NOT a constant noise. It only occurs when several factors of speed, rpm, and acceleration line up perfectly.
Any ideas? I could really use the help.

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post #2 of 2 Old 11-11-2015, 10:31 AM
tucsonzj
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2000 TJ Wrangler 
 
Join Date: Jul 2012
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check drive shafts for play in the u joints, also check motor/tranny mount.

His:00 TJ "Fiona" stuff/stuff/stuff
95 ZJ 3.5" w/242 swap-Sold
Hers: 15 JK Sahara-3" Teraflex
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high mileage , rumbling , vibration

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