Question about 2000 Hyundai Sonata

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2000 hyundai sonata 4 cylinder when start up and it stalls won't idle start again and stalls if i step hold gas pedal will runs keep revs and almost dies then back rev and almost dies again then let go pedal it dies there no check engine light

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Check under hood for a vacuum hose off,broken, cracked or loose at a connector.

Posted on Mar 14, 2011

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I've been having problems with my Hyundai Sonata 1999 with a 2.4L 4 cyl. Running rough when started. Have to push gas pedal to start or stalls after running for a few seconds.. Sluggish/jerky starts when...


could be a few things the start up could be the idle air control sensor (my first thought), the coolant temp sensor for the computer might be a secondary thought for the engine being cold if the computer thinks its warm. that would be the first 2 places i would start without a check engine light or code to reference

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Car will not start without pressing gas pedal to keep idle speed up. If I keep idle at 900 RPM or higher it runs as long as foot is on gas pedal. It then stalls out when I take foot off gas pedal. No...


Have the idle bypass valve checked, also called idle air control valve.
If that valve is stuck in the closed position, it's not allowing the fuel to bypass the throttle plate to keep it idling, resulting in stalling, but will keep engine running if the pedal is pushed down.

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When I pump gas into my 2000 Hyundai Sonata my car stalls with start up. If I keep my foot on gas for a few seconds it's fine. I had the fuel filter replaced and added gas treatments the stalling problem...


It is possible that when fueling, the fuel is aerated and the pump pulls agitated fuel into the system. you can thry this, fuel up as normal, but wait five or more minutes before starting. see what happens. good luck

Jun 10, 2009 | 2000 Hyundai Sonata

1 Answer

Car running problem


Ok Slow deceleration rev responce was part of the ECU software to keep the emissions down ,however if this has only just started you can try to reset the IAC valve ,the procedure is as follows.

Turn ignition key on ,unplug the IAC valve ,turn the key off ,replug the IAC valve. do this 3-4 times .Then start the engine while holding the gas pedal to 2000 rpm ,then slowley let the go of the gas pedal till the engine idles .

The IAC valve is located on the throtle body and has 4 wires to it.

Sometimes the throtle body needs to be cleaned and then reset.

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Engine stalls


your on the right route but also check egr valve

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