Question about 2004 Kia Rio

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The reason I'm checking the timing belt is that there is mis-fire in 1 & 2 cylinder. If the firing order is 1,2,3,4. I have continues fire out of 1 & 2, when plug wires are pulled out of head. 3 & 4 will shut off the motor are almost shut off motor if pulled out of head. I have back fire out of throttle body, 1 & 2 spark plugs are new but look a year or two old because they have gas on them. I was told it was running lean when this all started, I put on fuel filter, fuel pump, mass air flow. Had it checked again, it showed mis-fire on 1,2, &3. I changed the coil, plugs, plug wires. Checked cam sensor and crank sensor with meter, they seem to be fine. Was told by Kia service manger to check timing and it looked fine. So what should I check next?

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  • Douglas Hansen
    Douglas Hansen Oct 16, 2010

    Did you try a compression test? It does sound like you have "jumped" timing.

  • eldoraajones Oct 16, 2010

    Yes, compression test checked out good, 240 on all cylinders. The timing belt is only 3 months old, head was replaced at the same time.

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Unplug the fuel injectors, check the olhms on all. the readings should all be the same, around 11-11.5 olhms. Any readings that are higher is a sign of a bad injector which is what your problems sounds like., putting to much fuel to a cylinder causing different fuel amounts to each cylinder and causing it to backfire out of the throttle body , excess fuel . Also remove the throttle body and clean with cleaner and a toothbrush after replacing any injectors. Or there's a simpler answer and that the cambshaft is worn-out/round causing the lifters not to open enough to let in all the fuel. A worn belt would not cause misfires only on select cylinders but rather jump timing, slipping a notch on a gear and possibly bending a valve or valves and this cause a loud clacking or a really a sign to quit running the motor because it's broke! Good luck.

Posted on Oct 16, 2010

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