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NF Sonata 2.4 auto
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Discussion Starter · #1 ·
I live in Australia.
I resently purchased a NF 2006 Sonata 2.4 auto.
The steering is vague and the suspension feels soft.
Then I put a few suitcases in the boot, the steering gets even vaguer, to the point of being scary to drive at 100kph on sealed country roads.
Has anyone else found this concern and how did you fix it?
New tyres fitted and run them at 35 PSI
 

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Try dropping the tire pressure to the factory recommended setting, I believe 30 PSI, and as far as the suspension, maybe just worn out.
 

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I think new shocks and springs (both front and rear) would go a long way to fixing it. If it has over 100k miles you should consider rebuilding the front suspension as well. I replaced the upper control arms, upper and lower ball joints and tie rod ends as well as shocks and springs on mine and it made a huge difference in how the car handles.
 

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Discussion Starter · #4 ·
I think new shocks and springs (both front and rear) would go a long way to fixing it. If it has over 100k miles you should consider rebuilding the front suspension as well. I replaced the upper control arms, upper and lower ball joints and tie rod ends as well as shocks and springs on mine and it made a huge difference in how the car handles.
Thanks for your input.
The Sonata has done 235000k's so I will get a quote to do the work.
Did you use genuine parts or non genuine parts and did use a suspension specialist or Hyundai service centre?
 

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Discussion Starter · #5 ·
Try dropping the tire pressure to the factory recommended setting, I believe 30 PSI, and as far as the suspension, maybe just worn out.
Thanks for your suggestion - will the tyres wear out quickly at 30PSI as they 'look' soft at that setting?
 

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I had 300,000 miles on the old '08 with the OEM suspension and no problems. There is no mileage as to when replacement is necessary,
just check for leaks, broken springs etc., just another way for shops to get money.

Keeping the tires at the OEM pressure will not result in excessive tire wear, a real misnomer, and don't forget, when they get hot
the PSI can rise 3-4 degrees.
 

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Discussion Starter · #7 ·
I had 300,000 miles on the old '08 with the OEM suspension and no problems. There is no mileage as to when replacement is necessary,
just check for leaks, broken springs etc., just another way for shops to get money.

Keeping the tires at the OEM pressure will not result in excessive tire wear, a real misnomer, and don't forget, when they get hot
the PSI can rise 3-4 degrees.
Thanks again for your help :).
I will try the tyre pressures as per the tyre placard in the door for light driving - usually only me and my wife in the car.
 

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Thanks for your input.
The Sonata has done 235000k's so I will get a quote to do the work.
Did you use genuine parts or non genuine parts and did use a suspension specialist or Hyundai service centre?
I think my control arms were Hyundai and aftermarket for the rest. I did the work myself so the total cost was very low. I didn't replace the lower control arms since the bushings looked to be in good shape and keeping them there made the rest of the job relatively simple. Not really all that much more work involved than doing just the shocks.
 

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Discussion Starter · #9 ·
I think my control arms were Hyundai and aftermarket for the rest. I did the work myself so the total cost was very low. I didn't replace the lower control arms since the bushings looked to be in good shape and keeping them there made the rest of the job relatively simple. Not really all that much more work involved than doing just the shocks.
Thank you :)
 

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My 07 has over 200K miles. Several years ago I noticed the auto seemed to 'wallow' a bit here and there. I replaced the struts and shocks with high performance KYB parts that were slightly used,,,,u read that right. I immediately noticed the ride was better although a tad on the stiffer side. I liked the ride but the stiffer ride exaggerates any exhaust piping or window rattle . I don't recall the steering being a problem and there are no strange noises or clunks when I turn a corner so I believe the front suspension is still ok....albeit probably slightly loose. When I hear a clunk or notice sloppy steering I will tackle the suspension though. Sloppy steering could b dangerous to you and your loved ones so u are right to bring this to our attention. When the car is not moving does the steering wheel have a lot of play? If so then the problem could b a joint somewhere along the steering shaft to the rack and pinion box. A worn suspension could also b contributing to this issue. Put the auto on a stand and try to move the front wheels back and forth. Any play what so ever and it's rebuild suspension time! You'll have to figure what suspension parts need replacing though.....a crowbar and your muscles come into play here.... that is essentially how they do it at a shop. Check this out but be careful (bad things happen). Good luck
 

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Discussion Starter · #11 ·
My 07 has over 200K miles. Several years ago I noticed the auto seemed to 'wallow' a bit here and there. I replaced the struts and shocks with high performance KYB parts that were slightly used,,,,u read that right. I immediately noticed the ride was better although a tad on the stiffer side. I liked the ride but the stiffer ride exaggerates any exhaust piping or window rattle . I don't recall the steering being a problem and there are no strange noises or clunks when I turn a corner so I believe the front suspension is still ok....albeit probably slightly loose. When I hear a clunk or notice sloppy steering I will tackle the suspension though. Sloppy steering could b dangerous to you and your loved ones so u are right to bring this to our attention. When the car is not moving does the steering wheel have a lot of play? If so then the problem could b a joint somewhere along the steering shaft to the rack and pinion box. A worn suspension could also b contributing to this issue. Put the auto on a stand and try to move the front wheels back and forth. Any play what so ever and it's rebuild suspension time! You'll have to figure what suspension parts need replacing though.....a crowbar and your muscles come into play here.... that is essentially how they do it at a shop. Check this out but be careful (bad things happen). Good luck
Thanks for that, I’m going to get an oil service done in the next few days, have the brake fluid changed too, get the shop to check her out. . . And have the throttle body cleaned.
“The Limo” (my Sonata) now has new tyres, and wiper inserts - she hadn’t been driven for 2 years because the previous owner couldn’t drive anymore - steers much better :)
I noticed that both front speakers don’t work, have tried to make adjustments on the head unit, but only back ones work- so will check the connections on the back of the head unit tomorrow.
The master windows control won’t work on all windows, yet the switches on the individual doors work, so have ordered a 2nd hand master from the wreckers.
So hopefully all will come up good - thanks again :)
 

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Thanks for that, I’m going to get an oil service done in the next few days, have the brake fluid changed too, get the shop to check her out. . . And have the throttle body cleaned.
“The Limo” (my Sonata) now has new tyres, and wiper inserts - she hadn’t been driven for 2 years because the previous owner couldn’t drive anymore - steers much better :)
I noticed that both front speakers don’t work, have tried to make adjustments on the head unit, but only back ones work- so will check the connections on the back of the head unit tomorrow.
The master windows control won’t work on all windows, yet the switches on the individual doors work, so have ordered a 2nd hand master from the wreckers.
So hopefully all will come up good - thanks again :)
U sound like me....in that u tackle problems before they mount up! I too have had my share of problems ...window switches window motors speakers etc. One nifty thing u might b interested in though, Keeping in mind I am a cheap guy....forced too be because the misses and I r retired.. I always buy used then inspect the parts and rebuild them if necessary. Anyway, I purchased a used old school 200 watt Sony amp for $35 dollars....kids scoff at a measly 200 watts but it won't blow out the speakers. I got some 8 gauge wire and put in a used Pioneer head. I then got a 8 inch round subwoofer wired it all up. Wow, is all I can say.....Perry Como and Laurence Welk never sounded so good!
 

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Discussion Starter · #13 ·
That's a kool idea - once I get the service completed, I'll look around for a 2nd hand head unit - where did you find the fitting kit for the stereo?
Did you rebuild the window switches and if so how?
Appreciate your help - from one retire to another.
 

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That's a kool idea - once I get the service completed, I'll look around for a 2nd hand head unit - where did you find the fitting kit for the stereo?
Did you rebuild the window switches and if so how?
Appreciate your help - from one retire to another.
Thought u might like my "upgraded" stereo......I'll go to the auto and take a few pictures. Give me a few minutes. Oh, I just realized u r in Australia....I'm sure you don't have any idea who Laurence Welk or Perry Como is....they are a couple of old guys from a long time ago!
 

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I live in Australia.
I resently purchased a NF 2006 Sonata 2.4 auto.
The steering is vague and the suspension feels soft.
Then I put a few suitcases in the boot, the steering gets even vaguer, to the point of being scary to drive at 100kph on sealed country roads.
Has anyone else found this concern and how did you fix it?
New tyres fitted and run them at 35 PSI
At 230Km, you should consider the following maintenance to keep your car in tip top condition.

1). Drain and fill the power steering fluid. Use a clean turkey baster and remove some of the old power steering fluid, then top off with new ATF. Drive the car and turn the steering from lock to lock in a figure 8 pattern. With the engine on remove some power steering fluid.

Warning. Do not remove so much as to suck air into the system.

Tips n Tricks: Get two empty glass pickle jar and put the dirty fluid into the jar. Check the color. Perform the lock to lock figure 8 drive, drain and fill until the flurid looks clear red. It might take 3-4 drives. Your steering should feel much smoother and firm after the flush.

Most OEM and aftermarket serpentine belt require 60 k miles or 100km inspection and 90K miles or 150km change out. Going longer can damage the serpentine belt tensioner. And make the power steering feel non-linear or erratic.

2). Consider changing the serpentine belt, tensioner and idle pulleys. These tend to go out at 100K miles or 200km. Simptoms of these items wearing. Tensioners hitting the stop making mechanical noise and hum on the right side of the car. Power steering sometimes getting stiff because of belt slip. After changing these items, our 2010 Santa Fe AWD got very quiet and the power steering was smoother and belt squeak/mech-bangs-hums disappeared (especially when the air cond. was on.).

3). You should flush your brake with new Dot 3 brake fluid. This will make your brakes feel more firm and improve the ABS-traction control. Remember Hyundai used the brake ABS as traction control, when you have uneven brake pads or dirty brake fluids, the car may feel like the steering is non-linear or erratic. This is most likely your cars computer kicking in the ABS during poor weather and have to deal with uneven brake pads and dirty brake fluid.

4). Change your gas-cap, oil-filler-cap and dip-stick O-rings. These are known sources of vacuum leak and trigger Evap-can to release poorly distributed fuel vapors causing idle wobble and cold acceleration stumble.

5). The 08 Sonata have the differential inside the transmission. Please drain n fill the ATF to improve the transmission shifts and improve the differential operations. When the transmission fluid gets dirty the differential can act up and not feel linear when turning. Changing the transmission fluid improves the differential operations.

On AWD vehicles I change the differential fluid with 75W-90 full synthetic gear oil with limited slip friction modifier.

6). Think about performing a mini-tune-up. The coil boots and sparkplug spring connectors wear out before the spark plugs. The boot and spring connector kits are $2-$5 USD at RockAuto. This will prevent water intrusion and improve the spark, preventing misfires and poor idle, cold acceleration..

7). Think about changing the radiator cap and drain/fill radiator fluid.

8). Start using one can of Chevron Techron with every oil change. Hyundai recommend doing this to remove any gas-turned-jelly and varnish from injectors. This is because the fuel filter is difficult to service, it is inside the gas tank connected to fuel pump.

9). Carefully clean the throttle body and pay close attention to idle port. Clean this area of carbon deposit to insure smooth idle.

Best Wishes
 

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Here's a few pictures. I paid about 50 bucks for the used stereo head, about 20 bucks for the dash insert....notice I did not match the color. I paid about 15 bucks for all the wire....notice the household lamp wire. Also I purchased the fuse and 8 gouge wire from Amazon for very little.. I purchased a new subwoofer for about 35 dollars from Amazon. Got the used amp from eBay for 35 dollars. I read some posts and looked at You Tube videos for the install.. The sub fit perfectly in the hole that was not filled from the factory. All in all it was a learning experience and got me away from the misses for a bit.
 

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At 230Km, you should consider the following maintenance to keep your car in tip top condition.

1). Drain and fill the power steering fluid. Use a clean turkey baster and remove some of the old power steering fluid, then top off with new ATF. Drive the car and turn the steering from lock to lock in a figure 8 pattern. With the engine on remove some power steering fluid.

Warning. Do not remove so much as to suck air into the system.

Tips n Tricks: Get two empty glass pickle jar and put the dirty fluid into the jar. Check the color. Perform the lock to lock figure 8 drive, drain and fill until the flurid looks clear red. It might take 3-4 drives. Your steering should feel much smoother and firm after the flush.

Most OEM and aftermarket serpentine belt require 60 k miles or 100km inspection and 90K miles or 150km change out. Going longer can damage the serpentine belt tensioner. And make the power steering feel non-linear or erratic.

2). Consider changing the serpentine belt, tensioner and idle pulleys. These tend to go out at 100K miles or 200km. Simptoms of these items wearing. Tensioners hitting the stop making mechanical noise and hum on the right side of the car. Power steering sometimes getting stiff because of belt slip. After changing these items, our 2010 Santa Fe AWD got very quiet and the power steering was smoother and belt squeak/mech-bangs-hums disappeared (especially when the air cond. was on.).

3). You should flush your brake with new Dot 3 brake fluid. This will make your brakes feel more firm and improve the ABS-traction control. Remember Hyundai used the brake ABS as traction control, when you have uneven brake pads or dirty brake fluids, the car may feel like the steering is non-linear or erratic. This is most likely your cars computer kicking in the ABS during poor weather and have to deal with uneven brake pads and dirty brake fluid.

4). Change your gas-cap, oil-filler-cap and dip-stick O-rings. These are known sources of vacuum leak and trigger Evap-can to release poorly distributed fuel vapors causing idle wobble and cold acceleration stumble.

5). The 08 Sonata have the differential inside the transmission. Please drain n fill the ATF to improve the transmission shifts and improve the differential operations. When the transmission fluid gets dirty the differential can act up and not feel linear when turning. Changing the transmission fluid improves the differential operations.

On AWD vehicles I change the differential fluid with 75W-90 full synthetic gear oil with limited slip friction modifier.

6). Think about performing a mini-tune-up. The coil boots and sparkplug spring connectors wear out before the spark plugs. The boot and spring connector kits are $2-$5 USD at RockAuto. This will prevent water intrusion and improve the spark, preventing misfires and poor idle, cold acceleration..

7). Think about changing the radiator cap and drain/fill radiator fluid.

8). Start using one can of Chevron Techron with every oil change. Hyundai recommend doing this to remove any gas-turned-jelly and varnish from injectors. This is because the fuel filter is difficult to service, it is inside the gas tank connected to fuel pump.

9). Carefully clean the throttle body and pay close attention to idle port. Clean this area of carbon deposit to insure smooth idle.

Best Wishes
Raymund I'm impressed. Your recommendations are excellent and especially relevant when our auto's get upwards in the miles!
 

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Raymund I'm impressed. Your recommendations are excellent and especially relevant when our auto's get upwards in the miles!
Thanks. Please hit the like.

Hyundai’s are very particular, because the FWD have the differential inside the transmission and they use ABS brake system for traction control. Keeping those systems clean make the steering feel smoother and more linear.

The older Hyundai’s still had hydraulic power steering via a pump, therefore keeping the serpentine belt, tensioner and idle pulley as well as power steering fluid clean make those systems function very smoothly and linear.

Best Wishes.
 

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Raymund I'm impressed. Your recommendations are excellent and especially relevant when our auto's get upwards in the miles!
What inspired me to perform “Severe Service” maintenance cycle are 1). Farrah Haines getting 1 million miles on her Elantra with original engine/transmission, 2). 3-4 Local Kia Dealers offering life-time unlimited mile engine/transmission warranty to original owner and to customers who got service at the dealership. Kia have the same engine/transmission as Hyundai, but these dealerships suffered ZERO engine transmission warranty recalls!

The 3-4 Kia dealers offering Lifetime Unlimited miles engine/transmission warranty requires you to be the original owner and get all maintenance done at the dealer. Everything else will wear out. Serpentine belts, brakes, water-pump, spark-plug, air filters, coil boots/spring connectors, brake calipers, CV joints, suspension parts, transmission fluid, oil filters, etc…. You still have to pay for services, …but with proper service these engine/transmissions last a very long time.
 

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Discussion Starter · #20 ·
Thought u might like my "upgraded" stereo......I'll go to the auto and take a few pictures. Give me a few minutes. Oh, I just realized u r in Australia....I'm sure you don't have any idea who Laurence Welk or Perry Como is....they are a couple of old guys from a long time ago!
They have nice music and singing :)
 
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