I own a 2004 Hyundai Sonata with a 2.4 L, 4 cylinder motor. I am getting a sever harmonic vibration that occurs when the engine is 1500 to 2500 rpm. No vibration at idle and significantly less vibration above 3000 rpm. The vibration occurs whether or not the car is in gear. Furthermore, the transmission has been recently worked on and the vibration is still there. The mechanic has said it may be something is touching something else, but not sure. Has anyone run into this problem?

SOURCE: Hyundai Sonata 06 engine runs key out ignition in off position

car should be under warranty .. try having a new key made .if that dosent fix it. it's in the key lock maybe a wire loose .

SOURCE: Hyundai Sonata 2002 idle at high RPM and accelerate 40-45 MPH

Look for a vacuum leak somewhere. This is the most common problem for a high idle.

PAUL MC G

• 1280 Answers
• Posted on Oct 18, 2009

SOURCE: 2003 Hyundai Sonata vvvibbbrraattteess!!!!

There are Two Balance Shafts on the 2.4. Did your mechanic also change the balance shaft belt when he changed the timing belt? If he didn't, you'll want to do that. Since you mentioned the old belt was missing teeth, those loose teeth flying around could have damaged the crank position sensor and sensor blade (tone wheel). Also, the front balance shaft (on the side of the engine nearest the radiator), has THREE different positions when the timing mark is lined up - here's the glitch - ONLY ONE of them is the correct one - this is probably where your vibration is.

Testimonial: "The car is going back into the shop on Wednesday of this week...I just spoke with the mechanic and he is going to look at all of your advice! Thanks!"

SOURCE: Hyundai sonata 2004 transmission hiccups

The battery being disconnected at one point, has nothing to do with
your trans issue. It may just seem like a coincidence, that the trans
just started to act up, once the battery was reconnected.First off, how
many miles does the car have, and have you checked the trans fluid
anytime rescently, to see if it's full?

SOURCE: I have a 2003 hyundai

2ltr kia majentis/hyundai sonata both same engines/gearboxes,you may need the crankshaft from the engine to mate the manual flywheel.I would buy the whole transmision as you just take one out and drop one in.dont forget the electronics as the mapping system is different.