No, not the song with the same name but an intermittent vibration. It will start out very faintly and gets more pronounced the farther you drive until it feels like you are driving over the road side rumble strips. If I pull over and stop, or get to a stop sign or red light and stop, it goes away when I drive off. I can drive sometimes for days without it happening. Since it is not a constant vibration, I have ruled out universals and CV joints. So what am I missing?

Thanks!

 

You need to post more info on your Jeep for anyone to be able to help.


year/engine/trans/stock/lifted/mods done???

 

yes we need a lot more information from you besides the bare minimum. You have, what seems like, a dynamic balancing problem. The wrong amount of balancing beads will cause this kind of problem. So will water in your tires.

 

Wait....I'm starting to get a vision in my crystal ball!! 249 viscous clutch?

 

 

Sorry. It is a stock 2006 with no modifications. It has the 3.7 engine, automatic.

I have eliminated universals and CV joints only because it is so intermittent. I have had both go on other vehicles and it makes the diagnosis very simple, unlike this situation.

Thanks
Tico 1447

 

So it's a grand cherokee?

 

Yes, Grand Cherokee Laredo.

 

awd?

 

Pretty sure the WK with the 3.7 only came with the cheesy non-selectable AWD system.

 

Yes AWD.

 

Are all the tires the same brand, size and equal amounts of tread wear? If not that will be your problem. The difference in tire diameters will cause the viscous coupler to act up. If it has been driven that much like that the coupler should still be ok once you fix the tire issue.

Max

 

Probably the best place to start. Many AWD vehicles get pissy when tires are different sizes. Even a tire that may have worn more than the others can cause this. Check your air pressure as well and make sure they're even.

 

Thanks but the tires are new and all teh same brand and installed at the same time. The tire pressure is good as well. Yesterday I took it on a 300 mile trip and nothing happened. This is what is so frustrating about this situation. It might be weeks between incidents. The Jeep has 117,000 miles on it and aside from this problem is a great vehicle.

Thanks!
Tico1447

 

How about the brakes? You could have a caliper that sticks occasionally, especially the front ones. Those dual piston calipers are more trouble than they're worth. If one of the pair sticks, it can cause the pad to **** and drag enough to heat up. Next time it happens, stop and feel the wheels to see if one is hotter than the others.