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  #1  
Old 05-24-2015, 04:14 AM
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QL suspension jiggly

Recently I've really noticed the suspension on my '14 Limited EcoDiesel with ORA2 exhibiting jiggling/shuddering/high-frequency bouncing over road irregularities such as bridge expansion joints and rough spots. It really only does it at highway speeds, say 50mph and up and seems worse with more weight in the vehicle and after tires have heated and pressures have climbed into the 36psi+ range. Tires (stock Michelin Latitude 18's) are set at 32psi cold as specified. No signs of leaking shocks in the rear; can't check the fronts as they're integrated into the quadra-lift air springs. It doesn't bounce on the springs like it would with worn shocks. Tires look OK; I'll be rotating them soon so that may be a data point to consider. 14k miles on the clock.

Seems like these bumps set off a resonance in the suspension and/or tire setup that causes the wheels to bounce. Really feels like overinflated tires or worn shocks. It didn't do this at delivery. I'm prepping for a trip to the dealer but fear the dreaded "it's normal" or "can't replicate". Anyone else with QL have this happen?

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  #2  
Old 05-24-2015, 08:21 AM
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Re: QL suspension jiggly

Any chance it's settling into its park height instead of the aero mode. It almost sounds like it's riding on the bumps stops.

Disclaimer: I have no direct QL experience and did not stay at a Holiday Inn last night, just thought I'd put in my 2.


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Old 05-24-2015, 02:45 PM
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Re: QL suspension jiggly

Doesn't seem like it. Ride height seems fine and it doesn't feel like it is bottomed out. No QL errors either.
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Old 05-25-2015, 01:14 PM
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Re: QL suspension jiggly

I believe the 18s are supposed to run 33psi cold, not 32...unless they've changed that.

Have the temps been getting significantly warmer where you are lately? If so...two things are happening: (1) the tire tread is softer due to road surface heating and (2) the shock fluid is less viscous. There can be enough change to be noticeable to some people.

Check your tire pressure in the EVIC while its feeling this way. If it is indeed around 36psi, when it cools down adjust your cold inflation to get yourself around 38 (or even 39) psi fully heated. That should be around 34-35psi cold.

Try it and see if it makes a difference.

At 14,000 miles you've also eaten through the first layer of tread on those Lattitudes. My first '14 had them and after about 12-15000 miles those tires are not super wonderful...they got rather noisy and "gushy" for lack of a better term.

Lastly, check your alignment. I've seen some alignment weirdness creep in that can affect ride based on how the suspension dynamics respond.
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Old 05-25-2015, 04:10 PM
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Re: QL suspension jiggly

Yes, I have them set at 33-34; my other car runs at 32 and that's the number I had in my head. They get to about 37 when warm (maybe 38 if I'm carrying more weight).

Temps haven't been significantly warmer, but I've noticed it for a number of months even back when temps were cooler.

I'll mess around with pressures and tire rotation this week before heading to the dealer. I have a couple body items and software updates they need to do as well. I'll have them do a once over on the alignment and tires while it's in.
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Old 05-27-2015, 05:48 PM
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Re: QL suspension jiggly

Quote:
Originally Posted by MBDiesel View Post
Recently I've really noticed the suspension on my '14 Limited EcoDiesel with ORA2 exhibiting jiggling/shuddering/high-frequency bouncing over road irregularities such as bridge expansion joints and rough spots. It really only does it at highway speeds, say 50mph and up and seems worse with more weight in the vehicle and after tires have heated and pressures have climbed into the 36psi+ range. Tires (stock Michelin Latitude 18's) are set at 32psi cold as specified. No signs of leaking shocks in the rear; can't check the fronts as they're integrated into the quadra-lift air springs. It doesn't bounce on the springs like it would with worn shocks. Tires look OK; I'll be rotating them soon so that may be a data point to consider. 14k miles on the clock.

Seems like these bumps set off a resonance in the suspension and/or tire setup that causes the wheels to bounce. Really feels like overinflated tires or worn shocks. It didn't do this at delivery. I'm prepping for a trip to the dealer but fear the dreaded "it's normal" or "can't replicate". Anyone else with QL have this happen?
Independent of your issue, my 18" Limited and 20" Overland both said 36lbs cold. Maybe ORA2 and or Diesel has a different spec?

I think folks have tried to correlate this with 20" and QL and couldn't find any correlation.

It seems EVENTUALLY RE-Alignment and/or Re-Balance fixes it.

I sometimes wonder if it could be out of balance rotors.
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Old 05-28-2015, 02:22 AM
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Re: QL suspension jiggly

It could be balance. I rotated the tires today (rears to front, fronts cross to rear) and the mile or two I did on the freeway this afternoon seemed different. Might be taking a little trip this weekend so we'll see for sure then. If it feels different then, it's definitely off to the dealer to road force balance them all.

One thing that I noticed while rotating the tires that should give everyone an idea of what it feels like...take a wheel/tire off the Jeep, pick it up about an inch or two and let it bounce on the tread. The frequency of that quick bouncing is what it feels like.
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Old 05-28-2015, 08:39 AM
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Re: QL suspension jiggly

Balance could be contributing. Does your steering wheel shake at all?
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Old 06-02-2015, 01:58 AM
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Re: QL suspension jiggly

Not noticeably.

I'll get the dealer to road force balance all four and then I'll post the results. Need to get that put on the calendar; currently juggling work and getting my radio equipment installed in the Jeep...including punching 3/4" holes in the roof!
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Old 06-02-2015, 04:40 AM
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Re: QL suspension jiggly

Quote:
Originally Posted by MBDiesel View Post
Not noticeably.

I'll get the dealer to road force balance all four and then I'll post the results. Need to get that put on the calendar; currently juggling work and getting my radio equipment installed in the Jeep...including punching 3/4" holes in the roof!

That's the problem right there! Your Jeep is shaking at the thought...
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Old 07-20-2015, 07:09 PM
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Re: QL suspension jiggly

An update...

Upping the pressure to around 36 cold helped a little, but the bounce was still there. Got a road force balance with a Hunter machine on all four wheels at a tire shop. Balance was slightly off but the bounce was unchanged. They said the wheels look straight and the tires didn't exhibit excessive road force; lowest tire was 3lbs, highest 23lbs.

One side of me says the tires are doing it. It seems relatively well behaved, although not ideal, for the first five or six miles of highway driving. Then bumps start setting it off when the tires start to heat up and the pressure starts to rise. It doesn't bounce or wallow slowly like it has bad shocks; it damps dips and humps in the road just fine with one to one and a half cycles of the suspension. Just quick, sharp bumps and holes on the highway is where it has trouble damping. It was worse towing a 16' travel trailer. I've been wanting a better tire for a while, might just go pick up a set of Michelin LTX MS2 or AT2 before these dumb Latitudes are shot. They're about 1/2 done at this point at 18k miles.

How are the front QL struts designed? Is there a more or less standard oil damper built into the air spring, or is there some sort of fancy air valving going on in there for damping? Suspension bounce test passes, although I do remember reading somewhere on here that that test doesn't accurately diagnose bad QL struts. The front suspension is definitely harder to manually compress and bounce than the rear. I've done a fair bit of offroading in this WK2, but nothing that I'd consider damaging to the suspension, especially for a Jeep.

I keep hearing people saying the WK2 is one of the most comfortable rides they've had, and mine was very good when I took delivery. My 15 year old, 105k mile Mercedes with original shocks and suspension rubber and 45-aspect tires manages bumps better.

Have not done an alignment yet, maybe that's the next step.

Getting ready to roll in to a different dealer here soon...
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Old 09-29-2015, 12:15 AM
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Re: QL suspension jiggly

So I'm just past the 20k mark now, and things aren't getting any better, even with the new Cooper Discoverer A/T3's I just put on. With the Latitudes it evolved into a constant up/down shake which a rebalance didn't fix. Now I've had the Coopers balanced twice and they aren't any better at any pressure from 33 up to 40, perhaps even worse with the stiffer sidewall.

I'm starting to point at the struts...we'll see if the dealer will play along.

This is getting old.
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