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99 kia sephia lack of power
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scorch1962
New User
Jun 14, 2005, 5:30 AM
Post #1 of 2
(3953 views)
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99 kia sephia lack of power
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Had my car checked by a computer and it had 3 error codes . The one error code was for a low voltage circuit on the oxygen sensor. This sensor was replaced back in september when i had some exhaus work done. The other codes was for system too lean and cylinder 2 misfire. Sparkplugs and wires have been replaced. Anyone got any ideas?
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DanD
Veteran
/ Moderator
Jun 15, 2005, 4:49 AM
Post #2 of 2
(3913 views)
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Re: 99 kia sephia lack of power
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Even though you have had these parts replaced doesn’t guarantee they are not at fault. Were the replacements parts original equipment or after market? After market is fine in most cases but there are times when the manufacture or the marketer of these parts will lump three or four part numbers together because their specification are close. With electronic engine controls close isn’t good enough, close could start a chain reaction leading to power loss and false codes being set.
Even original equipment parts can fail so make no assumptions.
An O2 sensor not reporting the actual amount of oxygen in the exhaust will cause the computer to adjust the air/fuel mixture until it sees what it thinks is the proper amount. Whether that be rich or lean the computer will try and drive the mixture in that direction and if it cannot it will set a code.
Now an excessively lean running engine may be the cause of the #2 misfire, not enough fuel to sustain combustion or the misfire could be the cause of the lean code being set.
Due to that lack of combustion (misfire) the oxygen along with the fuel is not being burnt and the computer thinks the engine is lean and in turn adds more fuel to the mix.
Kind of like the chicken or the egg argument.
Misfires can be caused by a number of different reasons, to many to mention here other then its not always the spark plugs.
I know this doesn’t answer why your car isn’t running properly, all I was try to say is that power loss issues and codes are not always a cut and dry repair. There are hundreds of reasons that can cause even one of the symptoms that you mentioned.
Take the car into someone that you feel is competent with the systems on the car and that doesn’t mean the cheapest guy in town nor does it necessarily mean the dealer.
Good luck and keep us posted.
Dan.
Canadian "EH"
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