Question about Hyundai Elantra

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My buddy has a 2000 Hyundai Elantra that has a bad drivability issue...I am a master ASE tech but have run out of ideas. The car has a p0300,302,303 codes in the PCM. the plugs and wires are new. The car will not miss if you just feather the gas pedal, but if you try and normally accelerate or hard accelerate the car has no power and the check engine light flashes (indicating a misfire condition)...if while the car is misfiring you go back to just barely touching the gas pedal the car will accelerate fine..also the primary o2 sensor is new...any further ideas?

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  • JoeKay May 11, 2010

    Yachtdoctor - how did you make out with the solution? I have the same problem, except no codes at all. I replaced the TPS, and also the fuel pump regulator located at the end of the fuel rail. It improved things to where the gas can be feathered with no missing. As soon as you try reasonable demand acceleration, the misfire returns until around 2000 rpm, at which it disappears again. Fuel pump pressure was checked, and it was fine. Any other ideas out there?



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Have you checked the MAF and/or TPS sensor?. I have had the same issue before on the same kind of car and it turned out to be the MAF sensor.

Posted on Nov 07, 2008

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If the car has a distributor pickup or ignition module which steps up the voltage under heavy acceleration that may be bad.gnition

Posted on May 05, 2009


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