2000 Hyundai Sonata Weird sound

206,000 MILES • V6 • FWD • AUTOMATIC
Avatar
KOUNO3790
  • MEMBER
  • 2 POSTS
For the last year there has been a weird sound from the engine, and of late with the cold it has become a lot louder. The sound I would best match, like a small diesel engine or a rough idling engine. (It is a normal unleaded fuel car). Car still starts easy enough, little loss in power, no smoking, no fluid leaking, no oil burning and the only code is for a bad MAF sensor. I have had friends say that is the problem and other say that wouldn't do it. Any help would be great.
Feb 14, 2014 at 6:52 AM
Avatar
KHLOW2008
  • ✓Experienced Mechanic
  • 41,812 POSTS
Noise problem is something we are not of much help unless where it is coming from. Base on a guess, I would say it is the valve lifters that is causing the noise and that could be due to failed hydraulic valve lifters, low engine oil level or oil quality has deteriorated.
Feb 16, 2014 at 12:27 AM
Avatar
KOUNO3790
  • MEMBER
  • 2 POSTS
Yeah, sadly noise alone is hard to guess on. If it helps at all the noise goes away at around 40 MPH, and sound is coming from upper engine. (Used a tube today to try and get a location) I have heard that it could be the valves once before, but that was a guess from a friend. Oil level is good and been changed a month a ago.
Feb 16, 2014 at 10:32 AM
Avatar
THIS IS MIKE
  • ✓Experienced Mechanic
  • 686 POSTS
I would check to make sure that the tube from the air filter box to the engine is on tight and doesn't have any hole or damage first. then make sure the air filter is clean and the tube isn't blocked. if all that's good then replace the MAF. If you've got a code and its bad then it will run poorly, but I'm not sure about the noise.

Knowledge is power
Expert
Feb 17, 2014 at 8:31 AM
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Frequently Asked Problems for This Vehicle