98 Grand I6 loud deceleration, groaning - JeepForum.com
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Unread 07-15-2013, 12:40 AM   #1
jvillalp7
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1998 ZJ 
 
Join Date: Sep 2012
Location: Las Vegas, Nv
Posts: 10
98 Grand I6 loud deceleration, groaning

Everything runs fine until i hit 30mph-40mph the groan starts up as if the A/C is on or something is putting the engine under stress. The same goes for deceleration. At first ithought my brakes were groaning really bad but noticed its not. And the engine will not do it in park even while revving the engine...???
98 Grand Cherokee I6 130kmiles

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Unread 07-15-2013, 01:14 AM   #2
Oldfrog
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1997 ZJ 
 
Join Date: Feb 2008
Location: Louisiana/Texas
Posts: 3,630
Does it sound like it's coming from the engine compartment or do you "feel" it more than just hear it, through the gas pedal, shifter handle, etc? If it doesnt do it in park....than it's probably not the engine. ( could be mains, but i doubt it...for they tend to knock)

When my rear pinion bearing went out....it was only heard when there was a load on it....as in accelerating or pulling a hill. Yours could be a wheel bearing, though. How about when you apply the brakes? Does the sound change or stop?
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Unread 07-15-2013, 03:38 AM   #3
jvillalp7
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1998 ZJ 
 
Join Date: Sep 2012
Location: Las Vegas, Nv
Posts: 10
Applying the brakes it sounds the same. Sound comes from the engine. i also do have a slight knock and it sputters to accelerate once in a while. i actually do not feel it at all. even my passengers can hear the sound. its a loud humm...freeway usage going 65-75mph no noise but only between 30-40mph and when letting off the gas 40mph and under. even with no a/c its confusing
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Unread 07-15-2013, 07:24 AM   #4
zjosh93
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1993 ZJ 
 
Join Date: Aug 2010
Location: Austin
Posts: 1,086
If you put in in neutral and let the engine drop to idle speed while driving when its groaning does the noise go away? If you hold the brake, put it in drive, and rev the engine does it make the sound?
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Unread 07-15-2013, 07:24 PM   #5
jvillalp7
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1998 ZJ 
 
Join Date: Sep 2012
Location: Las Vegas, Nv
Posts: 10
Today I got up to the speed of when the sound starts, dropped it into neutral and the noise stopped, put it back into gear noise came back
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