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George H.
George H., Hyundai Technician
Category: Hyundai
Satisfied Customers: 2091
Experience:  Hyundai Gold certified, ASE Master tech 15+ years
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I've changed the # ***** ignition coil and all the spark plugs

Customer Question

I've changed the # ***** ignition coil and all the spark plugs and I am still getting a reading on my scanner PO303 (# ***** cylinder misfiring) what could possibly be the problem now? This is for a 2013 Hyundai Sonata 2.4 GAS engine.
Submitted: 2 years ago.
Category: Hyundai
Expert:  Ricardo Hohl replied 2 years ago.
Hi welcome to just answers , sorry you are having this problem with your vehicle , let me ask you? have you done a cilynder compression to determine the cylinders ability to compress gases pass 100 foot pounds?
Expert:  Ricardo Hohl replied 2 years ago.
another thing you need to do is a cylinder static pressure test , this will determine the condition of the valves.
Customer: replied 2 years ago.
thank you, ***** ***** do that and get back to you.