Having trouble pinpointing this suspension knocking sound... - Jeep Commander Forums: Jeep Commander Forum
Suspension / Lifts This is the place to discuss the suspension, lift systems, and other stuff underneath your Jeep Commander

 
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post #1 of 6 (permalink) Old 09-07-2009, 07:20 PM Thread Starter
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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,
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Last edited by p@55w0rd; 09-07-2009 at 07:23 PM.
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post #2 of 6 (permalink) Old 09-07-2009, 08:13 PM
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Quote:
Originally Posted by p@55w0rd View Post
Any suggestions welcome!
Only drive it when it's dry.

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post #3 of 6 (permalink) Old 09-07-2009, 08:22 PM
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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.

Good luck,
Rob
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post #4 of 6 (permalink) Old 09-07-2009, 10:13 PM
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Quote:
Originally Posted by robby View Post
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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post #5 of 6 (permalink) Old 09-07-2009, 10:25 PM
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X3

Retorque the Driver's side upper control arm. Thats where my noise was coming from.

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post #6 of 6 (permalink) Old 01-08-2011, 12:35 PM
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I finally found a thread that describes my problem! I too only get this sound on occasion when the vehicle is wet. It makes a loud popping sound under the drivers side that sounds terrible.

I'll go check the recommended spots asap!

Thanks!

Current: 2013 Dodge Challenger R/T 6 Speed

Traded: 2006 Jeep Commander Limited Hemi 4x4
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