Say Goodbye to the Flat Spotted Tires / Shuttering Theory

[arcman]

dboz...

I'm absolutely convinced it's a rear driveshaft problem. Did the dealer show you the stack of shafts they put on your car? I think I said this earlier but I'm really skeptical of the them going to the trouble to replace three driveshafts on your car. That's a lot of work.

If you go back to my original post, I disconnected the rear shaft and the vibration was gone. This was the vibration at 28-30 mph. And when I changed the Guibo, the ticking noise went from 29 and started down at 25 mph. I can't be 100% certain but that's pretty good evidence it's the shaft. I was seriously about to buy a new driveshaft until you posted you'd had it changed a couple times.

One thing for sure... I'm burned out on this for the time being and I'm slowly getting to the point the ticking noise is hardly bothersome.

On the other hand... The other day I was on the interstate for just a few miles and the thing started to shake like hell at speed. Got off, did some shopping, got back on and ever since it's been as smooth as can be.

The car has it's share of little niggles, but the good outweighs the bad by a bunch.

 

[dboz1031]

Well, look, I have those same issues as you do. A new shaft did fix the clicking. They reset my transmission computer. I drove this morning and it was smooth. Will see what happens over the next few days but I have low confidence. I agree, I still like my car, just wish this issue was resolvable. I was hoping you were going to come up with a NEW PART that we could swap in there to take it away. Don't forget, I have a new transfer case and new rear diff out of this too. I also have highway vibration at times. I can't understand why it would come and go if its the shaft. Torque converter makes more sense to me. The reason they won't appease me with a new one is this, 1, they say there is no guarantee it will fix it, 2, you need an entire transmission for this car as you just cannot change the converter. So, IMO, they do not want to pay for the repair. They are going to call the engineer people back on my car. The service manager can feel the issue easily and he says its not normal. Dunno, will keep this updated IF or WHEN I figure something out with this. I don't think its worth me taking a bath on this car so will just keep living with it for now.

Also, I had shaft balance issues because it does come as a full unit but the shipper kept separating it and it would screw it up.

 

[arcman]

Torque converter would be RPM dependent, not speed. Mine's always speed. I've shifted to a lower gear and it was still there. 29mph.

Yeah, the fact of it going away only to return after sitting for a few hours has me baffled too.

I think I mentioned it before, but the used shaft I bought had a rather sagged center bearing support. I don't know how many miles it had but the U-joint was hardly worn. If it wasn't such a hassle, I'd like to flip my existing bearing 180 deg. (raising the effective bearing height about 5/8") to see if that had any affect on it. I poo pooed that, thinking if I went to the trouble removing all that shit to get to it, I might as well throw a new shaft at it... until your post. Wish I had a lift. I'd tackle a lot more.

 

[asleep@thewheel]

This may be of no help at all, but I have a 2016 C7 Corvette also and they have had issues with shudders and vibrations that are caused by the torque converter when the engine goes into V4 cylinder mode (a full saving thing). I plugged a little gizmo into my car that prevents it from going into V4 mode and have had no problems.

I don't even know if our Genesis' have a V4 mode, but thought I'd throw that out there.

I am lucky so far, no problems with my 2015 5.0 at all...except tire issues, which I resolved.

Good luck with a fix.

 

[Aquineas]

This may be of no help at all, but I have a 2016 C7 Corvette also and they have had issues with shudders and vibrations that are caused by the torque converter when the engine goes into V4 cylinder mode (a full saving thing). I plugged a little gizmo into my car that prevents it from going into V4 mode and have had no problems.

I don't even know if our Genesis' have a V4 mode, but thought I'd throw that out there.

I am lucky so far, no problems with my 2015 5.0 at all...except tire issues, which I resolved.

Good luck with a fix.

That's actually kind of interesting. No, the Genesis doesn't have anything like that at present, but it's still good to know. Personally, I've always wondered about how the engineers would handle uneven wear on the cylinders that were never turned off, and lubrication on the cylinders which did turn off. I could possibly see something which randomized or rotated which cylinders would be activated/deactivated, but by the time they worked out the bugs on that we'd all be on electric motors anyway.

 

[Kraig Wilkinson]

This may be of no help at all, but I have a 2016 C7 Corvette also and they have had issues with shudders and vibrations that are caused by the torque converter when the engine goes into V4 cylinder mode (a full saving thing). I plugged a little gizmo into my car that prevents it from going into V4 mode and have had no problems.

I don't even know if our Genesis' have a V4 mode, but thought I'd throw that out there.

I am lucky so far, no problems with my 2015 5.0 at all...except tire issues, which I resolved.

Good luck with a fix.

How did you resolve your tire issues?

 

[asleep@thewheel]

Threw away the POS Michelins and put Continental Extreme Contact DWS 06's on it.

The Michelins handled fine, but the resonating road noise (with about 3,000 miles on them) was deafening.

I'll buy the Conti's again...MUCH BETTER.

 

[Kraig Wilkinson]

This may be of no help at all, but I have a 2016 C7 Corvette also and they have had issues with shudders and vibrations that are caused by the torque converter when the engine goes into V4 cylinder mode (a full saving thing). I plugged a little gizmo into my car that prevents it from going into V4 mode and have had no problems.

I don't even know if our Genesis' have a V4 mode, but thought I'd throw that out there.

I am lucky so far, no problems with my 2015 5.0 at all...except tire issues, which I resolved.

Good luck with a fix.

I have not had any driveshaft issues

Threw away the POS Michelins and put Continental Extreme Contact DWS 06's on it.

The Michelins handled fine, but the resonating road noise (with about 3,000 miles on them) was deafening.

I'll buy the Conti's again...MUCH BETTER.

I concur! The Continentals seem to work well for me out here in the colder climates. The Continentals I pulled off had plenty of tread. They had hard spots and would not road force balance . So I put another set on there and what a difference. I have flat stoppers I use . The car would sit for months at a time before I purchased the car. This winter I just might pull off the tires. Its a pain in the but to do so. However its better than wasting 1100$. Thanks for your reply asleep@thewheel!

 

[arcman]

That shuddering is just the four cylinders not firing and not contributing to a smooth rotation. Nothing to do with the torque converter. My wife's MDX that she just got rid of had the three cylinders shut of at slight cruise throttle. Annoying as hell. No one at the dealer mentioned it and it wasn't untill after a few hundred miles did I really notice it. Honda will do anything to gain mileage. The last Honda we had was a 2003 Accord and it would regulate the alternator on and off constantly, enough that at nite it almost looked like you were turning the high beams on and off.

 

[joegr]

...Torque converter does rotate if car is in park....

I agree about the drive shaft, but I have to question your statement on the torque converter. If the crankshaft is turning, then so is it.

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[tlivingd]

I agree about the drive shaft, but I have to question your statement on the torque converter. If the crankshaft is turning, then so is it.

The outside of the torque converter is connected to the flex plate that is then connected to the crankshaft.

The inside of the torque converter is connected to the transmission input shaft.

Fluid connects the outside portion to the inside portion.

 

[asleep@thewheel]

That shuddering is just the four cylinders not firing and not contributing to a smooth rotation. Nothing to do with the torque converter. My wife's MDX that she just got rid of had the three cylinders shut of at slight cruise throttle. Annoying as hell. No one at the dealer mentioned it and it wasn't untill after a few hundred miles did I really notice it. Honda will do anything to gain mileage. The last Honda we had was a 2003 Accord and it would regulate the alternator on and off constantly, enough that at nite it almost looked like you were turning the high beams on and off.

According to GM the problem WAS the torque converter. They have replaced, or done multi step flushes, on many C7 Corvettes because of this exact issue. Many Vette owners, like myself, have taken steps to prevent the car from going into V4 mode, and thus had no problems with the torque converter.

 

[joegr]

The outside of the torque converter is connected to the flex plate that is then connected to the crankshaft.

The inside of the torque converter is connected to the transmission input shaft.

Fluid connects the outside portion to the inside portion.

Yes, and both parts are turning while the transmission is in neutral or park, with the engine running.

 

[joegr]

According to GM the problem WAS the torque converter. They have replaced, or done multi step flushes, on many C7 Corvettes because of this exact issue. Many Vette owners, like myself, have taken steps to prevent the car from going into V4 mode, and thus had no problems with the torque converter.

I would suspect that the vibration from the crankshaft was resonating in the torque converter, so the torque converter really could be the most at fault here...

 

[dboz1031]

I will restate this. My car does sometimes shudder while completely stopped. Nothing else it can be except the torque converter or the engine itself. And the converter has electronic lock up, so if its screwed up it may not be locking up. And yes, I have shifted gears in the 25-30 zone and the issue remains. So I ruled out actual transmission trouble. I will see what happens on my way home. Heading out now.

 

[TinsleyC]

Arcman, you were pretty convincing that it was the flex coupler, that it was setting up and hardening in an angled state, causing a wobble when starting out cold (basically). Is that not the consensus at this point? It made sense to me.

Curious how many of you with vibrations or wobble happen to park on a sloped street or driveway. My G80 has no issues and sits on a flat garage floor. Or maybe this has nothing to do with anything. Just surprising how some cars are affected and others are not.

 

[dboz1031]

It’s because it’s a bad converter. Drove home last night, smoother than it’s been but not completely gone. Nothing done to the shaft, just reprogrammed the transmission. It’s something with the electronic lockup. I am going to have the engineer come back and check my car. I wish he would have been there 2 weeks ago when it was really bad. So something with the reset did lessen my issue to Some degree.

 

[tlivingd]

Arcman, you were pretty convincing that it was the flex coupler, that it was setting up and hardening in an angled state, causing a wobble when starting out cold (basically). Is that not the consensus at this point? It made sense to me.

Curious how many of you with vibrations or wobble happen to park on a sloped street or driveway. My G80 has no issues and sits on a flat garage floor. Or maybe this has nothing to do with anything. Just surprising how some cars are affected and others are not.

On mine, the problem was gone the first day we had frost; So a cold day, but then came back when it was 65* or so the following. It's parked outside but in a flat location. One weird day with mine however was it had the problem bad, I then took a 2.5 hr drive at 75mph waited a 1-1.5 hr then 2.5hr back again at 75 mph and the problem was gone for about a day and a half, and was less severe when it showed back up in a couple of days.

 

[tlivingd]

greasing and Clocking the shaft parts didn't fix it. They changed the entire drive shaft. Only drove 10 miles and claim it maybe gone but they're going to try to drive it more.

 

[dboz1031]

Had the shakes yesterday for my morning drive, drove home and smooth the entire time.