Question about 2001 Hyundai Sonata

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What could be causing lack of power?It wont hardly climb a hill but if your goin on a straight way it has been missing a little.Already changed the plugs and wires.uses alot of gas.

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  • Steve Allison
    Steve Allison Jul 04, 2010

    Although it wouldn't normally cause missing, have you checked or changed the air filter?

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  • 541 Answers

Change fuel filter to start. could be a sensor problem, i.e. throttle position sensor. check engine light staying on ? any codes from OBDII?

Posted on Jul 04, 2010

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When going up hills I lose momentum I changed the plugs,wires, and 02 sensor and it goes up to 3 rpms why isn't it fixed?


First check for any codes, then test vacuum with a good vac guage. When reving engine the vacuum should drop and then climb back up. Check for vacume leaks by spraying carb cleaner at any vacume hoses and intake areas but not at air filter.

then also check compression as well as look at spark plugs to see that they are all tan and no differences in any one. Go to YouTube and search for how to test engine with a vacuum gauge.

Most any problem with an engine can be diagnosed with a vacuums gauge but do use a second test method as you have learned replacing parts hoping to fix a problem is costly.

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You have not addressed why the cat overheated. One cause is the engine running rich. If you have not fixed that then the problem will still be present. That appears to be the case due to lack of power. Describe the noise

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Fuel pressure Normal range is 35 to 70 PSI. Without the proper fuel pressure needed the vehicle surges and looses power especially goin up hill and at WOT(wide open throttle) . Its a good call if you change full filter your going to any way. you got a surge going on. Also check the airfilter once that plugs up it will also cause the surge. Surges happen when it lacks something so your getting less of some thing

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