Hyundai Sonata Problem Report

Hyundai Sonata Rough Idle Due to Faulty EGR Switching Valve

(64 reports)

On the 2.7L V6 and 2.4L 4 Cylinder, a defective exhaust gas recirculation (EGR) switching valve may cause an intermittent rough or unstable idle engine.

engine idles rough when in drive but not in neutral -
Rough idle, lack of acceleration at times, and poor gas mileage. -
Rough idle when stopped. Car shakes a lot. -
engine light indicated need to repalce EGR valve. Did so a a week later it says the same thing again and idle is rough again. Why???? -
Rough idle and engine seems very rough while accelerating from a dead stop. Runs well at cruising speed. Only seem rough when the engine is under load. -
Rough and unstable engine. Feels like gas is choked from engine or loose battery wires. Then car takes off. Scary! Not fixed yet -
She runs ruff when idleing and even worse if the a/c is running . The shaking slows down if i put her in drive or neutral. -
Roough idle, jerks a little when driving, began to stall. Will change Throttle Position Sensor and see what happens. -
Failed emissions due to egr -
My 2004 Hyundai Sonata 2.7 V6 started having a rough, low rpm idle after it hit 105,000 miles. I haven't had it repaired yet but plan to do the work myself. Thanks cor the helpful information, much appreciated! -
Check engine light, rpm fluctuations, shakes at stoplights. Also, has stalled when getting gas. -
Car started shaking a lot when parked and engine was at idle. Check engine light is on and car shakes when in stopped in Park or Drive, but not neutral. -
Check engine light came on the first time when we were up at elevation. From there the engine (at different times) seemed to idle a little rough and get worse gas mileage. -
check engine light is on, car running a little rough. -
My sonata dies when I slow down at red lights and when I slow down to make a turn. -
Exactly as stated. Rough idle in drive. Replaced the canister purge switching valve, [easy], problem solved. This model has no EGR valve, likewise no EGR. -
Exact problem as stated. On my Sonata there is no EGR stitching valve or EGR valve. There is however, a canister purge valve. That corrected the problem. -
Third EGR Valve since 2012! Help -
my 2003 hyundai sonata 2.4 vibrates so hard when I'm at idle calms down in neutral -
Just bought one for my Daughter - original owner had it before me, did all the required maint. 190,000 miles and looks and drives great! The problem was the check engine light. The issue was the MAF (Mass Airflow Sensor). Get the special spray at your local auto parts store for the MAF. Take it out and clean it, and change the Air Filter at the same time. Then disconnect the battery for at least 3 hours to reset the check engine light. Drive it for at least 100 miles - I had to do this to reset the computer to pass emmisions. It is still running like a champ. It was so good, I cleaned my 2009 Camry and 2001 Sequoia's MAF. I hear this helps with gas mileage too. A Throttle Body clean wouldn't hurt either. -
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