Hyundai Sonata Problem Report
Hyundai Sonata Rough Idle Due to Faulty EGR Switching Valve
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 - rmkjmk
Rough idle, lack of acceleration at times, and poor gas mileage. - Visitor
Rough idle when stopped. Car shakes a lot. - Visitor
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???? - revroysail
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. - Visitor
Rough and unstable engine. Feels like gas is choked from engine or loose battery wires. Then car takes off. Scary! Not fixed yet - Visitor
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. - Visitor
Roough idle, jerks a little when driving, began to stall. Will change Throttle Position Sensor and see what happens. - pbc90723
Failed emissions due to egr - Visitor
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! - Visitor
Check engine light, rpm fluctuations, shakes at stoplights. Also, has stalled when getting gas. - Visitor
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. - Visitor
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. - jamminj
check engine light is on, car running a little rough. - Visitor
My sonata dies when I slow down at red lights and when I slow down to make a turn. - Visitor
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. - OldFrt
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. - Visitor
Third EGR Valve since 2012! Help - Visitor
my 2003 hyundai sonata 2.4 vibrates so hard when I'm at idle calms down in neutral - Visitor
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. - Slavman
The car vibrates when idling in any gear (not neutral or park). It is also very sluggish at tak...
For a month my car has tried to stall and shakes like crazy when I am idling. No codes ever sh...
Did tune up-Dist. cap/rotor/wires/plugs.96k miles. Ran 1 week ok then dead hole miss. Compres...
i replaced the egr valve on my 2001 sonata and it still idles rough. could it be the egr soleno...
When I switch on the a/c of my Hyundai Sonata it blows air which is not cold. The A/c switch sh...