Discussion in 'Hyundai' started by xcel, May 12, 2016.
Could the jerk be from the DCT engaging the clutch instead of from the brakes?
Hyundai brake pads last a long time with gentle use. What kills them at a young age is rust on the caliper slides, but maintenance in that area keeps them going for years.
The slight jerk may or may not be the computer bumping the clutch a bit to get the car moving? Depending on clutch temperature, the computer adjusts the clutch engagement so it will behave differently sometimes.
Hi Mike and Chris:
It has nothing to do with the brakes for sure. All I can say is that the DCT is not as smooth as it was for the first 40k miles "sometimes." That is about the miles where it began to randomly occur. If I am traveling stop and craw for hours on end in the city of Chicago, that is when it begins to show up with about every other creep launch providing a slight jerk, jerk, jerk through about 3 mph. A turn of the wheel and sometimes it jolts pretty bad which is when I am really concerned. I am trying to catch it on camera but it is so random that I never know when it will occur??? If I am doing a lot of highway or suburban miles, it rarely if ever appears and is barely perceptible. It feels like the Dry Clutch is possibly wearing unevenly with a lot of stop and crawl use and after a few miles of highway, that wear is evened out again??? Very strange for sure.
And those brakes. Those discs and pads have been abused like nothing on this planet and when the guy came back and told me they were only half worn, I was in shock!
The DCT seems to be sensitive to temperature and doesn't like the "idle creep" that comes with heavy traffic. The hotter the clutch gets, the more "grabby" it seems to be. Get up to speed where the car stays in one gear for a while and things cool down and it gets smooth again. It seems to be the nature of the dry clutch designs.
Wear doesn't seem to be much of a concern except for some people with early Tucson DCT models that were reporting that the car wouldn't go into first gear. I have to think they're either driving with two feet and the left foot on the brake is preventing the computer from engaging the clutch, or the brake light switch is out of adjustment and the car won't apply power because it thinks the brakes are applied. They'd just tromp on the gas and the engine bounces off the rev limiter while the clutch grabs as best it can and things get hot really fast on the friction surface. Once it's hot, launches from a stop are a little bit of a bump-n-lurch affair.
At the 70,600 mile mark, I took a rivet or screw into the right front passenger Nexen N-Priz OEM tire. I am at 3/32nds all around so the OEM tires were scheduled for replacement within 3 to 5,000 more miles anyway. Not bad considering 60k of those miles miles were placed on them doing abusive hard stop and go during Chicago area Rideshare.
A new set of Hankook KINERGY PT (H737) in P195/65R15 size will be going on early next week.
I just ordered my Hankook Kinergy tires thru the Discount Tire in Naperville.
The price was fantastic ! I did buy their "certificates" @ $9.25 per tire , because
I may easily put 75K miles on in that 3-year period. I've already had one of the OEM tires destroyed by
a nail or screw. On I-88 , which you'd think would be a "clean" road.
I declined the $50 rebate for getting a Discount Tire credit card ; now I'm thinking it
might not be a bad idea. I imagine they will still have that offer when I go for
my appointment on the 27th.
If Wayne says the Hankook Kinergy is a good tire , then it's a good tire.
Hi Wayne..... from another thread.
We have one Hyundai Accent, & two Elantras. Switched our 195/65/15 Elantra tires to our standard 175/65/14 " wheel/tire Accent to lower Accent rpms on the highway. At the same time, put some 225/45/18 AND 225/55/17 wheels/tires on one Elantra.... which also lowered rpms. Worked wonderfully. Quite a quintuple coup. Bigger tires, sweet wheels, better handling, no MPG loss. ..... & dead cheap used prices.
Maybe the Hankooks are good , it's too soon to tell. But I can say THIS about Discount Tire : six days after they installed my new tires(Nov 27) , I needed to add air. Meaning , the TPMS indicator lit up. I added air myself ( for $1.50 ) up to 40 psi. Seven days later , the indicator lit up again. I've driven thru almost 50 Chicago winters , this ain't my first rodeo.
I know how often seasonal weather changes cause a tire to lose pressure. it's NOT every single week. So , either Discount tire screwed up the installation ( damaging the wheels or sensors ) or the Hankooks are defective. I've never had a new tire fail before. TWO new tires ? Even less likely. So tonight I'm going to do what I should have done a week ago : go back to Discount Tire and DEMAND that they correct this problem. These guys are supposed to be professionals, right ? Hmmmpphhh.
Continuing from my 12/10/2018 post above:
Twice now, 2 sets of four Hankook 426 tires have worn well for the first 20,000 miles. Like Jeckel & Hyde tho, both sets began wearing poorly, 1 set gone by 33,000 miles & the other set gone by 39,000 miles & that set, (as posted above), lasting a bit longer because it had been transferred to a lighter car during their latter stages of wear. Now, a two tire set of not quite half-used(?) Hankook 431 tires have worn out, while on the Elantra rear, in 24,000 miles of their latter stages of wear....while a two tire set of Yokohama GeoLanders, while on the front drive wheels, on the same car at the same time, tho worn considerably, seems to have extended their lives quite well, at their end.
Thanks , litesong. I will keep a close eye on my Hankooks , keep the air pressure up , and hope for the best.
The mostly-unimpressive OEM Yokohamas that came with my car in April 2015 lasted 76K miles , but the last 10K
would have been dangerous in the winter. The Hankooks were installed 11-27-2018 and have actually
been pretty good in snow.
Have 3 Hyundais, one Accent(140,000 miles; original front pads) & two Elantras(total: 120,000+ miles). At service times, my mechanic says Accent brake pads are great. Also, my mechanic blows the brake dust off the wheels & brakes & that restores brake feel to like new conditions.
Another 10k miles of rideshare on the new Hankooks...
The Elantra Eco's aFCD is 7.2 percent high so 41.9 mpg actual while doing the harshest driving duty cycles in existance.
So it's not just Toyota's that have over-optimistic fcd's. But yes , 41.9 for that kind of driving is impressive.
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