Really bumpy in the mornings

[Sprouter13]

Hello, looking for a place to start to try to figure this out. I have a 21 Mojave, 37’s on -12 fuels. Upgraded steering stabilizer to adjustable Falcon. Wheels have been on about 7 months.

I upgraded to the Falcon because of a really slight vibration that I thought might be the tiniest hint of death wobble. It helped but I still would get a slight vibration at times.

The weather is now much cooler here in Ohio, has been in the 30’s in the mornings. In the morning I get a continuous bump bump bump. I asked my girls if they can feel it riding or if it is just through the steering wheel. They said they feel it too. In the afternoons when it’s warmer, it is not as bad, but can still get a hint of it.

I would appreciate anyone recommendations of what to possibly look at to sure this?

Thanks!

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[zxd9]

Tires have flat spots from sitting overnight. I get it too, but it goes away in a few miles. Generally not a summertime issue.

 

[ShadowsPapa]

Some tires flat spot easily, and the colder it is, the worse they'll be. Driving on the highway and getting the sidewalls nice and warm makes them come out of it.

Steering stabilizer isn't for vibrations. It's for bump steer.
Vibrations are other issues and it won't correct them. It's used as a bandaid to hide problems, not cure them.

 

[Sprouter13]

I appreciate the responses. I did not realize the flat spots in the tires over cold nights was a thing, but makes sense. I’m newer to jeeps coming from a world where making things faster, and lower was the thing to do.

I do get the stabilizer is a Band-Aid. It was a convenient reason to make it more comfortable to drive on the highway.

thanks!

 

[ItsmeMrWright]

Tires have flat spots from sitting overnight. I get it too, but it goes away in a few miles. Generally not a summertime issue.

Good explanation. I have a 2025 Nighthawk, stock, and it does that as I approach freeway speed for a mile or two.

 

[ShadowsPapa]

I bought a 2003 WJ from my father's estate years ago. He had new tires put on it a few thousand miles before he was killed in an accident.
I bought it in the summer. As cooler weather came in, I noticed that it had sort of a minor bucking feel, and when I turned at the end of our driveway, the effect was left/right/left/right instead of an even up/down/up/down.
If it sat for just a day it wasn't too bad, but let it sit for several days, it took 3 or 4 miles getting up to highway speed for the effect to disappear. I hadn't experienced that since the 1980s when old-technology tires were still around. But I found out - it was still a thing with some tires.

 

[BearFootSam]

Could be the flat spots mentioned or it could be the shocks. I put on a set of falcons this spring to replace the blown out stock fox shocks and since it's turned colder I notice they are a bit bumpy first thing. I've been thinking it's the cold fluid based on the fact that it smooths out after 20 miles or so and the shocks have had a chance to warm up a bit. Falcon's instructions recommend to set them shocks to the soft setting when temperatures are low as the cold oil will have a higher viscosity.

It's normal that with cold tires, cold shocks, cold bushings, that everything is a bit stiff and creaky in the mornings like an old man.

 

[ItsmeMrWright]

Could be the flat spots mentioned or it could be the shocks. I put on a set of falcons this spring to replace the blown out stock fox shocks and since it's turned colder I notice they are a bit bumpy first thing. I've been thinking it's the cold fluid based on the fact that it smooths out after 20 miles or so and the shocks have had a chance to warm up a bit. Falcon's instructions recommend to set them shocks to the soft setting when temperatures are low as the cold oil will have a higher viscosity.

It's normal that with cold tires, cold shocks, cold bushings, that everything is a bit stiff and creaky in the mornings like an old man.

I felt that reply. <g>

 

[chr15m]

The OE Foxs on the Mojave are noticeably stiffer as well as noisier in my experience any time the temp drops below 50 degrees.

 

[Splenda]

What tire pressure are you running? Sounds like flat spots. Also, could be that the valving of those shocks are very sensitive to temperature. You might try putting them on the softest setting.

 

[Lost1wing]

I wanted to find out if sitting over night was the only issue. Yes this happens on several of my vehicles. I really never noticed until the county repaved the highway in front of my house. As soon as the tires would warm up, the ride smoothed out.

One evening, while my tires were still warm, I put my truck on the lift. I also left the doors open so the tires would get cold. The next morning I lowered the truck and took it for a ride. It was better than when leaving it on the ground outside, but not perfect. The tires had some miles on them and probably not perfectly round. I bet with newer tires it would have been smooth right away. These were load range E tires btw.

 

[ShadowsPapa]

I wanted to find out if sitting over night was the only issue. Yes this happens on several of my vehicles. I really never noticed until the county repaved the highway in front of my house. As soon as the tires would warm up, the ride smoothed out.

One evening, while my tires were still warm, I put my truck on the lift. I also left the doors open so the tires would get cold. The next morning I lowered the truck and took it for a ride. It was better than when leaving it on the ground outside, but not perfect. The tires had some miles on them and probably not perfectly round. I bet with newer tires it would have been smooth right away. These were load range E tires btw.

I knew mine was flat spots because the wump wump was coordinated, synchronized among the four tires until turning. Then it was left-right-left-right.
Flat spots from the cold should act exactly like that

 

[Lost1wing]

I knew mine was flat spots because the wump wump was coordinated, synchronized among the four tires until turning. Then it was left-right-left-right.
Flat spots from the cold should act exactly like that

Exactly! I had a little of both. Out of round tires and flat spots from sitting. The Gladiator is getting the new tires I picked up. Same Wildpeaks, same size. I get that sound you described, but I don’t feel anything. I bet it gets quiet after the swap.

 

[IanNubbit]

The bigger the tire the more noticeable it is. I balance and rotate all 5 every 3k and it still happens. Just is what it is

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