Noise from underneath....
05-18-2010, 07:24 PM
#21
JK Newbie
Join Date: May 2008
Location: Coto de Caza, CA
Posts: 33
Likes: 0
Received 0 Likes
on
0 Posts
Vibration noise
Today I crawled under my 07 unlimited and found 4 loose bolts on both the exhaust flanges where the exhaust pipes come up and meet the exhaust manifolds. Not easy but tightened them, no more vibration type noises on startup. Craig
05-19-2010, 08:20 AM
#22
JK Freak
Join Date: Jan 2009
Location: Los Angeles, CA-All Day!!!
Posts: 593
Likes: 0
Received 0 Likes
on
0 Posts
i had a very similar issue w/ my JK, i turned out to be a broken tack weld on the heat shield nearest to the catalyc conveter/s. i took into the dealership a couple of weeks ago & htey fixed the issue at no co$t. 
05-19-2010, 10:11 AM
#23
JK Freak
Join Date: Feb 2008
Location: delaware (north)
Posts: 513
Likes: 0
Received 0 Likes
on
0 Posts
are you sure you diddnt just scoop up some pebbles with your skid plate.
the tcase skid plate is very good at holding mud and rocks cause of its high walls.
and since you said it happened after draging it than that would be the opprotunity to catch a few
the tcase skid plate is very good at holding mud and rocks cause of its high walls.
and since you said it happened after draging it than that would be the opprotunity to catch a few
05-29-2010, 06:13 AM
#25
JK Enthusiast
Join Date: Jul 2009
Location: NJ
Posts: 435
Likes: 0
Received 0 Likes
on
0 Posts
Check the welds on the crossover exhaust pipe heat shield , one little broke weld makes it sound like you got tranny probs when you gas it. On mine one broke , I pryed it away with a screwdriver, no more noise. A month later, same thing, next weld. Check also the u-bolts that clamp your exhaust together.