Question:
I've changed out both coiles and all 4 spark-plugs and all wiring, and my '98 Kia Sephia still runs rough. Computer says that 2nd piston is misfiring. What could be wrong? Could it be a computer problem?
Answers:
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Could be lots of things. Broken piston ring, burnt valve, you name it. Sounds like you need a pro.I wouldn't say it would be a computer problem but check the distributor. You might have to take it to the shop to see if the timing for firing the pistons is correct on the distributor. Hope that helps. Good luck.
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Your #2 piston may have carbon buildup on it causing pre-ignition. Also the fuel being sent into cylinder #2 could be too much or too little-if a fuel injector gets clogged, it could cause a miss.Why does pepper work as a stop leak in ones radiator?
needs a tune upNEVER replace ANY part till you know the problem. It is not a computer problem. It's unusual to get a misfire code without an o2 sensor code. If you have a misfire it sets up a rich or lean condition in the exhaust and sets an o2 code. You may have a dirty injector or a distributor problem, if you have a distributor. We never receive enough info. about the problem to do a fair diagnosis. Could be an error in changing parts.
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Since we don't have the car here, I can attempt to give you a diagnosis based on what you state.1. You spent more money trying to avoid taking your car to a shop to get an educated diagnosis than what the shop would have charged.
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2. To find the correct diagnosis, you will still wind up taking your car to a shop to get it checked out.
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3. I doubt it is a computer problem as computers RARELY go bad.
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4. You most likely have an injector problem that may require replacement OR you may be able to use injector cleaner to correct. No, this doesn't mean buy that crap in a can that costs a buck ninety-nine at Autozone that you dump in the tank. I mean go to a shop that hooks the engine up to a can of cleaning solution and runs your car on it. It costs about $80 parts and labor to do but it is a strong concentration of cleaners. The tank crap gets diluted in the gas and doesn't work.
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And for those of you posting previously stating the it could be a distributor, this vehicle uses a DISTRIBUTORLESS IGNITION and both coils were replaced.
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