Over time, these heat shields can become loose, damaged, or rusted due to various road hazards. This type of rattling noise comes from the engine bay, underneath the car, and near the vehicles rear, depending on where the loose component is. The cabin is noisy, the engine is noisy - only the electronics and other creature comforts are good. Says there was tons of sludge and metal shaving in the oil. I asked if this was due to metal debris left in engine they said no. It doesn't last very long (a second or two) and only does it sometimes while accelerating. Specifically when you feel a noise when you accelerate on your Hyundai Sonata. New this year is a 10.3-inch infotainment touchscreen, a panoramic sunroof, and a . The Sonata tranny in the YF and LF is not a CVT. I only hear the noise under acceleration with the windows down along side concrete barriers. Husband test drove car as well and comfirmed a rattling noise. On third time (60,800 mi), car burned through oil and oil light came on, rattling sounds came back, stereo stopped working, car died (new starter needed). If your Hyundai Sonata produces a loud noise when you accelerate, it is quite plausible that the alternator belt is the reason of your problem. Just wondering, how did you put padding behind the dash? This noise may be a warning sign of a slackened belt, in which case the tensioner roller or its wear and tear may be responsible. I will take it to the dealer and see if they are able to fix the noise - my $20k mistake. The contact owns a 2006 Hyundai Sonata. As we know that you do not take these problems lightly, we have decided to compose this article to help you find the causes and wipe out this concern as quickly as possible. My car now sits in front of my home (inoperable) while I'm paying off the loan. He checked the spark plugs (he had just changed month prior) and they were all gooped up. Also when I'm driving in automatic, the car will suddenly go into manual first gear and I will have to shift over to manual and back to auto to put it in drive. The 2018 Hyundai Sonata has 2 problems reported for rattling noise while accelerating. Now he checks it 3x week. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. It sounds like a stone rolling around in the engine. If you notice a knocking sound coming from your engine bay that increases in sound as you accelerate, you may be experiencing rod knock. We actually drove 12 miles on city streets to a mechanic shop we knew who gave the first diagnosis. Some folks have described it as a rattle. Sevice technitian comfirmed in writing vehicle has a non repairable engine, metal extracts were found inside the oil pan and the dealership advised engine is no good and needs to be replaced. This was 2 years ago with 20,000 miles on car, and took to dealer who applied ecm update. It eventually got so loud and bad I had to park the car. How to Find Rattling Noises in the Car The first step you need to take is to isolate the cause of the rattling noise. I'm losing oil fast and there is not an oil leak. The noise is caused by a sticky valve train. If youve left your oil cap loose on top of the valve cover, that can cause a rattling sound. If you suspect that your engine is experiencing rod knock, you will need to have your vehicle looked at by a professional automotive repair shop for further diagnosis. A few weeks ago the car started acting funny. I checked under the car where I park both at home and at work and there are no oil spills on the ground.
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