Hyundai Sonata Bad Fuel Pump Symptoms + Diagnosis Symptom Description & Consequences Suggested Action Difficulty Starting The car may struggle to start or require multiple attempts. This occurs as the failing pump struggles to deliver enough fuel to the engine. Test fuel pump pressure; consider replacing the pump if it fails to meet required specifications. … Read more

I’ve seen many Hyundai Sonatas with a misfire.  Bad coil packs are one of the most common causes for this issue.  But, take a look at the spark plugs first before replacing a coil pack. Hyundai Sonata Misfire/Bad Coil Pack Diagnostic Table Symptom Description & Consequences Suggested Action Engine Misfire The engine runs unevenly and … Read more