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2002 Jeep Grand Cherokee laredo: My engine..It starts fine..shakes…

Customer Question
2002 Jeep Grand Cherokee Laredo...
2002 Jeep Grand Cherokee Laredo 129k miles

My engine has started running "hard" within the last two weeks. It starts fine, but when I idle, the engine shakes and vibrates and is overall loud. When I turn the engine off, its sounds kind of like an airplane engine turning off; it makes a longer sound than when you normally turn it off; maybe a fan? A belt?

I just had my oil changed and the transmission fluid looked good, any clue what the problem could be?
Submitted: 8 years ago.Category: Jeep
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Answered in 2 hours by:
6/14/2010
Jeep Mechanic: Randall C, ASE Master Tech replied 8 years ago
Randall C
Randall C, ASE Master Tech
Category: Jeep
Satisfied Customers: 13,443
Experience: ASE Master Tech, L1, Jeep owner, Shop owner
Verified
Hello , sorry for delay. I noticed this post. Can I still try to help with your question? If so, lmk and i will be online all evening. Thanks
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Customer reply replied 8 years ago
Yes, please. I have not found an answer elsewhere.
Jeep Mechanic: Randall C, ASE Master Tech replied 8 years ago
Thanks. The first step that must be done is to remove the belt from the engine. If the shke,noise etc is gone, then we know it is something belt driven that is the cause. The most common would be what is called the "Viscous Fan Clutch" It is the big round aluminum item behind fan blade. It is filled with special fluid and the it controls fan speed. It could be stuck etc and will cause exactly what you have going on. Picture below. Now.. it requires 2 special tools to remove it. You can buty them at any parts store very cheap.While belt is off you also need to hand spin the other items like alternator, PS, water pump etc just to be sure all spin quiet. I am thinking bad fan clutch but not there so hard for me to be 100%
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