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AZTechBrian, ASE Certified Technician
Category: Hyundai
Satisfied Customers: 708
Experience:  Owner
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2005 hyundia sonata idles rough, chaned plugs, coiols wires

Customer Question

2005 hyundia sonata idles rough, chaned plugs , coiols wires intake hoses cleaned throttle plate. What do you think?
Submitted: 1 year ago.
Category: Hyundai
Expert:  AZTechBrian replied 1 year ago.

Hello. Have you checked to see if the EGR valve is getting vacuum when sitting at idle? Remove the hose and check to see if there is any vacuum.

Customer: replied 1 year ago.
they go bad, is it it electronic or mechanical diaphram
Expert:  AZTechBrian replied 1 year ago.

The EGR on your car is a standard vacuum operated egr valve controlled by the egr control solenoid. If the vacuum line has vacuum, then your solenoid is faulty. If you don't have vacuum, then I would suggest removing the EGR valve and making sure it's not defective or stuck open.

Expert:  AZTechBrian replied 1 year ago.

If the check engine light is on, that would help us to be more certain of what is happening, but the egr vavle is where I would start.

Please let me know how that goes and if you need further assistance.

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