Question about Hyundai Sonata

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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 leaving for work or after. Runs fine after warmed up. At highway speeds (75 MPH) I get a jerking like the engine is missing or not getting enough fuel and very slow accelleration

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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

Posted on Jul 31, 2010

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My 2001 Hundai Sonata (4 cyl) either idles very roughly or dies when idling or when I am stopped at a stoplight or stop sign or in traffic. The only way to keep the car from dying seems for me to keep one...


OK!.... it's got more than 185.xxx miles.. right? (out of warranty). FIRST place to check:
1. TPS - Throttle Position Sensor - it's a potentiometer (variable resistor) which sends voltage signals to the ECU (Engine Control Unit). If it is malfunctioning (defective), it can cause the drivability issue you describe. However, this is NOT ALWAYS the case since you mentioned the vehicle has more than 185,xxx miles.
2. ECU (Engine Control Unit)
3. Vacuum Leaks
4. Injectors (leaking/clogged)
5. Deffective MAF (Mass Air Flow Sensor)
6. ... want me to continue?... best advice, have it properly diagnosed at an authorized Hyundai Service Department --- this way you'll know EXACTLY what the CAUSE is, and the parts/labor required to fix it!

Feb 20, 2011 | 2001 Hyundai Sonata

1 Answer

2000 hyundai sonata.. P0300, P0110 and P0102 codes..


Higher octane gas 93 with some good octane boost in the black can at autozone cost about 7 dollars or a bottle of 104 octane boost. Change the fuel filter. Probably only one coil pack is bad. The OBDII reader should tell you which one was a misfire.

Jul 15, 2009 | Hyundai Motor 2004 Sonata

1 Answer

Sonata stalls after running good for 10 minutes.


Ignition Control module, and crank position sensors, they get hot and fail and after brief cooling period they work again

www.aceautomotive1.com

if this information was helpful please give me a good rating Thank you,Randy

Aug 17, 2008 | 2001 Hyundai Sonata

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