Having trouble pinpointing this suspension knocking sound...
OK I have a suspension issue that is a bit strange. When it rains or the undercarriage of the XK is damp I have a fairly consistent knock coming from under the drivers side under hard braking or hard acceleration from a standstill. As far as I can tell it is somewhere around the 2nd row of seats near the outside middle of the car. BUT when the weather dries out (as well as the undercarrage) the sound is diminished significantly. This knocking sound became very apparent during the outing to Flagpole last month. I scheduled an appointment with the dealer but the sound stopped on it's own. But when I scheduled the appointment I could recreate the sound almost on queue. I know realized that the week I got back to town from this trip it was a fairly wet week. But we have had 2-3 weeks dry weather. Because it is raining today I finally made the connection because it is raining again and the sound is back.
Anyone ever experienced this before? Where should I look? I am going to check the upper and lower control arm bolts when the rain stops this week. But when it was dry I crawled up under the XK and could not detect any bare metal that would indicate any major issues. Any suggestions welcome!
2008 Jeep Green Rocky Mountain 4x4 4.7L, 245/65 R17 Fortera's,
class IV tow package w/shackle, front tow hooks, remote start,
MyGig w/backup cam, bun warmers, commandview, QTII,
Rocky Road Super Sliders (now installed and tested!), no lift, full Jeep OEM skid plates,
4xGuard Belly Guard, 4xGuard front skid, Surco 50 x 70 roof rack.
2006 Steel Blue 5.7L HEMI Limited 4x4 Build Date: June 9, 2006 Hour 14
Interior: Dark Slate/Light Graystone with Saddle Brown Leather Seats
Quadra-Drive II, NAV, DVD, Trailer Tow Group IV, Off-Road Group II, Remote Start, UConnect, Rear Backup
Camera, Chrome Wheels, Magnaflow cat-back exhaust, Daytime Running Lights enabled
Check rear shock bolt torque.
Check lower and upper control arm and panard rod bolt torque at the differential and subframe mount points.
These can be tight, but not tight enouph to hold the bushing sleeves when wet.
BTW..Had the same situation w. rear shocks on my Blazer this spring.
Noisey over small bumps wet only.
Check lower and upper control arm torque at the differential and subframe mount points.
This one has my vote! I had the exact same noise after I installed my lift. It turns out that "tight enough" wasn't really tight enough and I had to re-torque the upper control arm because I had removed that bolt for the install. Because of where the control arm mounts to the "frame" it makes it sound like it is coming from almost under you driver seat. I would check this first.
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