Higher Mileage 2011+ Sonatas - Page 28 - Hyundai Forums : Hyundai Forum
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post #271 of 322 (permalink) Old 07-30-2018, 10:17 AM
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Originally Posted by Adv Vantage View Post
Could you elaborate more on the symptoms of both?

I am trying to diagnose non-linear acceleration on high RPM (sth like a sequence of misfires which occurs after 4k rpm, often followed by a cloud of black smoke if revved to red zone). In addition, 3 cyl spark plug gets fouled fast (compression is ok, coils and plugs are new, ran valve and injector cleaners numerous times, hot soaked pistons with seafoam and mmo). Oil consumption is heavy, around 1q per 500 miles.

P.S. 152k miles here.

So for me, what was happening is that the car would start, but then go to a really, really low idle. Long story short, I had a completely separate problem with the interior light console in the roof (it would stay on or come on at random). At Boy Scout camp with my kid, went to start the car one day and the battery was totally dead. So after getting a jump start, the car shuddered, ran really rough with tons of hesitation, and then the car threw a check engine light. Code indicated a faulty map sensor. That was an easy fix for me since it's right at the top of the engine block, but the valve issue was something...my mechanic showed me the plugs. Completely fouled up with oil. So, the car has been running MUCH better since then, need to check the oil today to see how consumption is going.
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post #272 of 322 (permalink) Old 08-05-2018, 11:42 PM
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149,250 miles, went to the city and back (about 52 mi RT) and got 43 mpg even with a bit of city driving. Since it was up and back it couldn't be all downhill!

"If a man says something in the woods, and a woman isn't there to hear it, is he still wrong?"
Miles on her 156,700
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post #273 of 322 (permalink) Old 08-28-2018, 03:25 PM
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...just turned-over 150,000 today. 43.3mpg on the same run as last post.

"If a man says something in the woods, and a woman isn't there to hear it, is he still wrong?"
Miles on her 156,700
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post #274 of 322 (permalink) Old 08-28-2018, 04:26 PM
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101K. 28 MPG 70% city HAND calculated. I do not rely on computer pulse injector calculations.

KDM YF LED tails | Llumar 30% Ceramic Tint | Precision LED 5K Interior lighting | XenonSupply 4300K Slimline HID's | The "cup" mod
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post #275 of 322 (permalink) Old 08-30-2018, 11:30 AM
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herr_howard
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Originally Posted by Adv Vantage View Post
Could you elaborate more on the symptoms of both?

I am trying to diagnose non-linear acceleration on high RPM (sth like a sequence of misfires which occurs after 4k rpm, often followed by a cloud of black smoke if revved to red zone). In addition, 3 cyl spark plug gets fouled fast (compression is ok, coils and plugs are new, ran valve and injector cleaners numerous times, hot soaked pistons with seafoam and mmo). Oil consumption is heavy, around 1q per 500 miles.

P.S. 152k miles here.
Sorry it's taken a while for me to see this post...for me the issue didn't manifest itself with smoke or anything, but the engine just ran rough, was misfiring when running at highway speeds, things like that. One of the first things I noticed was that upon starting the car the engine would almost sound like it was going to shut off again, like a quick rev up then down again. The tach would jump to about 1500 rpm then down to about 500 then settle in around 1100. It was kind of strange to say the least.

After all of the work that was done, my oil is down like 1qt after about 3-4 weeks of driving. Still not happy about that, but it's better than 1 qt every 2 2 weeks. It's still very peppy.
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post #276 of 322 (permalink) Old 08-31-2018, 12:28 AM
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Originally Posted by herr_howard View Post
Sorry it's taken a while for me to see this post...for me the issue didn't manifest itself with smoke or anything, but the engine just ran rough, was misfiring when running at highway speeds, things like that. One of the first things I noticed was that upon starting the car the engine would almost sound like it was going to shut off again, like a quick rev up then down again. The tach would jump to about 1500 rpm then down to about 500 then settle in around 1100. It was kind of strange to say the least.

After all of the work that was done, my oil is down like 1qt after about 3-4 weeks of driving. Still not happy about that, but it's better than 1 qt every 2 2 weeks. It's still very peppy.
Thanks for providing the details! Looks like I have a different case, continue observing. I inspected valve cover gasket, no evidence of external leak.
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post #277 of 322 (permalink) Old 09-08-2018, 07:26 PM
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Passed 200,000 miles this week on my 2011 GLS, bought it new. It is still driving great and has been perfectly reliable.
No engine replacement? Now that is impressive.
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post #278 of 322 (permalink) Old 09-19-2018, 03:44 PM
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200K and still cruising!

2012 GLS. Bought in 2014 w/ 22,000 miles on it. Now have 202,000 miles. Still get 35+MPG on the highway, 27+MPG in easy city driving. Regular maintenance, and have only replaced the tires and steering wheel bushing. She runs great!
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post #279 of 322 (permalink) Old 10-04-2018, 01:10 AM
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I had to draw the line when I checked it before a road trip and had to add a qt, mid week I had to add a qt, then after returning I had to add another qt. That was the sign to let her go. Got $1200 for it and said good by. Now I'm rocking a 2018 Sonata Limited. I'm loving it.
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Passed 200,000 miles this week on my 2011 GLS, bought it new. It is still driving great and has been perfectly reliable.
Hmm. I'm about to reach 60000 on the car (2011). I skimmed through the ten past pages. It sounds like it's going to be a hit or miss with engine trouble, then? Also should be checking oil more regularly from now on. Maybe I should sell this car before it gets to 100000.
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post #280 of 322 (permalink) Old 10-04-2018, 06:10 AM
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Originally Posted by eli2k View Post
Hmm. I'm about to reach 60000 on the car (2011). I skimmed through the ten past pages. It sounds like it's going to be a hit or miss with engine trouble, then? Also should be checking oil more regularly from now on. Maybe I should sell this car before it gets to 100000.

When I parted ways with my 2011 GLS it had 170,000 miles on it. I had driven it fairly hard but took care of it maintenance wise. The oil consumption had started being a concern the past 6 to 8 months. I could tell that it consumed more oil during the times I would be under hard acceleration (tell, tell sign was the smoke from the exhaust each time I would accelerate hard (not black smoke, but blue-gray)). Up until the trip I would add about 2 quarts between oil changes (5000 miles). However, during the trip (prior, during, and after), 3 quarts was really the signal to either get work done on it or get a new car.



I choose the latter option. Really wanted a new car and I had just upgraded my son's car from a 2011 to the 2015 Limited. I was really loving his car so that also made my choice way easier. With some work, I'm sure the 2011 would have lasted well beyond 250K. Interior still looked fairly new, everything worked, but the issues were, paint job showed signs of age and the oil consumption issue.



Outside of normal wear and tear items as far as maintenance (like tires, brakes, rotors, plugs, coils, filters, belts, etc) I did replace the left front axle (162,898), clock spring (129,962), steering coupler (128,997), inhibitor switch (123,930), starter (67,563), and EVAP Canister (2,504 (split at seam, manufacture fault)).



Hope this mx track record helps you and everyone else out.
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