Question about 2000 Kia Sephia

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Head lights dimming and losing power while driving

Driving down the highway I started losing power. The car almost died. pushed in the clutch to pull over and the power came back. let up on the clutch and the same thing started happening again. Replaced the battery, fuel filter and air filter. now the loss of power doesn't make the car almost stall but dims the lights and still losing power. most notably on the highway. Could this be the sparkplugs? the altinator checks out fine and the dealer can't find anything wrong.

thank you for any help with this (120,000 miles)

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  • rfcharles2 Feb 03, 2009

    Thank you. I will mention this to the dealer and have him look into this

  • rfcharles2 Feb 03, 2009

    can you tell me where the gas cap vent is? Do I need a new gas cap? I want to understand what this is so I can explain it to the mechanic at the dealership

  • rfcharles2 Feb 04, 2009

    Thank you very much. I mentioned this email to the mechanic at the dealership today and he said he would look into it. I'm lucky to have a dealer that doesn't charge anything for the time they spend trying to find the problem.

    thanks again I really appreciate your time and help



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Next time this happens, pull over and unscrew the gas cap. The vent may be clogged.

Otherwise, your catalytic converter may be failing. It can also clog and hinder engine exhaust.

Good luck !

Posted on Feb 03, 2009

  • zero-7 Feb 04, 2009

    Hi again...

    The vent is part of the gas cap and cannot be replaced on its own. You need to replace the cap as a whole.

    Befor you do that, try what I suggested. When you start losing power on the highway, pull over, unscrew the gas cap, then get back in and drive. The Check Engine light may come on without the cap - don't worry about that for now.

    If the power loss does not return, the gas cap is at fault. Go get a new one.

    If the power loss returns even without the cap, your problemm lies elsewhere...perhaps a clogged catalytic converter.

    Hope this helps !




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