2001 Kia Sephia, WAS running, but missing when taking off.
As long as you were going, not so bad, but when you had to slow down and then accelerate again, or first take off, it missed and chugged pretty badly. Thought we got water in gas, used gas line antifreeze, and new tank of gas, no fix. Put in new fuel filter, and now it won't start at all. It will turn over, but won't start. When it was running, once in a while I would hear a thug kind of noise somewhere near under the drivers side floor board. Please help.
Re: 2001 Kia Sephia, WAS running, but missing when taking...
I had this problem after the engine was replaced on my 2001 Sephia, it's a sendor on the engine. This sensor is actually turning the engine off and on while driving... my mechanic replaced it with the one from my old engine and it is fine now
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It sounds like valve clatter. If you are also noticing black smoke from the exhaust, diminished engine response, etc then it has a faulty valve. I have to be honest. The Kia you have is not known as a good car. It was made before Hyundai took over for quality control. I would seriously consider selling the car while it still runs. I am sorry for this answer, but I own a 2012 Kia Optima and have heard service writer horror stories on the Sephia. Again, I apologize for my recommendation.
HAVENT SEEN VERY MANY PROBLEMS WITH THE FUEL PUMPS ON THESE PARTICULAR VEHICLE . YOU CAN TAKE THE 02 SENSOR OUT AND CHECK BACKPRESSURE WITH A GAUGE OR YOU CAN TAKE THE CONVERTER DOWN JUST 4 NUTS AND SEE IF YOUR ACCELERATION IMPROVES . BUT YES A CAT CONVERTER CAN CAUSE A VEHICLE TO BE SLOW TO ACCELERATE AND KEEP IT FROM GOING TO HIGH SPEEDS DUE TO THE BACKPRESSURE ON THE ENGINE . IF YOU TAKE IT TO A MUFFLER SHOP IT SHOULD RUN ABOUT 200.00 TO REPLACE WITH AN AFTERMARKET . IF YOU HAVE A PO420 IN THE COMPUTER FOR CHECK ENGINE LIGHT THAT IS THE LIKELY CAUSE THIS VEHICLE HAS 2 CATS A WARM UP CAT AND A MAIN CAT IT COULD BE EITHER OR BOTH .
Check the coil packs, I bet one is bad. You have two above the spark plugs, each feeds two cylinders. Easy and fairly cheap fix. I have 125k on a 2000 Sephia and have replaced the right side twice, while still on the factory left.