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2004 Kia Optima Question: Car starts fine. somtimes while driving car losses acceleration but stays runnin

 

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jvogel, 2.4L 4 Cylinder, Findlay, OH, August 18, 2012, 22:45
 Rookie

i think it was a p0134 code? cant get it 2 come back on. changed both cats & o2 sensors. still doing it. seems like it does it only when its above 75% outside. last time it did it, had 2 keep barely pressing gas 2 putt home. got home put n park reved up fine,put n drive with left foot on brake pedal and rt on gas & bout 2500 rpm car started sputtering. is it a crankshaft sensor or a fuel issue? im baffled. thank you

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  • Answer #1

    August 19, 2012, 05:26
     Master

    Who changed the parts(you or shop?) were all vacuum connections checked? NO exhaust leaks? OEM or aftermarket cat & O2 sensors?Were the replacement sensors direct plug
    -ins or did they require splicing the old connectors to the new sensors?

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    jvogel, August 23, 2012, 10:00
     Rookie

    Mechanic changed parts. dont think vacuum connections were checked. didnt see any exhaust leaks.aftermarket cats but no welding nessacary just nuts and bolts. bosch direct fit o2 sensors no splicing

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  • Answer #2

    August 19, 2012, 07:30
    Profile_thumbnail
     Master

    I think you should have someone check-TPS-MAF sensors and circuits.
    Try this little tip,i did and it worked on a car just like yours just last week.
    Now not all problems are related but this one sure sounds like it.

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    jvogel, August 23, 2012, 10:05
     Rookie

    i checked the MAF sensor. it looks new and clean? what circuits you talking bout and how do u check them? Ive thought maybe TPS too.

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    pushrod, August 23, 2012, 15:03
    Profile_thumbnail
     Master

    With scanner check TPS% should sweep from near 0 to near 100% at WOT.
    Should not drop out while sweeping throttle. Scanner will read what computer
    sees. MAF even though it looks new and clean if its a reman.try another one.
    Remans give a bit of trouble. Also i don't have very good luck with some
    02sensors,Bosh is one of them. At least at my shop. NGK better choice,again
    in my shop.If TPS sig. drops out engine will also.

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