Question about 1997 Kia Sephia

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97 kia sephia, replaced battery, plugs, wires, cap, rotor, air filter, fuel filter, added heet water removal and lucas fuel injector. It sputters, backfires/pops when accelerating and it has no power, drives like a golf cart with a dying battery. It starts up and idles okay and is smooth when you rev it at a certain level, but if you push more on the gas pedal, it wants to stall or sputter, backfire/pop, etc. Before, I got a code reader check, which output codes for misfire cyl. 3 and both oxygen sensors. After, I did the tune-up, it was better, but still having issues with the sputter, backfires/pops, lack of power, etc. Any ideas?

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As you have replaced all the obvious things that could cause the symptoms it may be a good idea to have a cylinder compression test done , if comes back OK i'd try a fuel addative , one that covers the catalytic convertor , as there are many sensor's involved in the fuel/exhaust system as you know , this addative will clean any residue affecting there reading's , hope this helps

Posted on Apr 06, 2017

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Posted on Jan 02, 2017

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SOURCE: Replaced battery, plugs, wires, cap, rotor, air

How many miles? I am NOT a mechanic! Sounds like possible timing belt/chain jumped a tooth. Or the timing advance mechanism is malfuctioning. (Unlikely - check distributor is tight or not shifted from normal position too far back or forward.) Assuming belt and not chain, 80 k miles or more, likely need to replace timing belt in any case, before it breaks. If it breaks, you'll be replacing valves and pistons too.

Posted on Nov 08, 2010

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