Ever 100k kilometer for odometer or 100k mileage, need to change spark plug and fuel filter assy. Also Change oil, air filter, and atf oil are normally change depends on the mileage for maintenance services
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there are many engines, used, so we cant guess that.... and is totally Germain.
here ill tick off a few, for low power, and there are many simple tests.
a tuneup, do the 60,000 mile listed tuneup now. Bam, runs.
low compression on any cylinder. or all.
bad spark (see tuneup)
if 1996 and newer, scan it , in USA scan the ECU/PCM.
bad fueling? too little or too much.
this is engine power, we need the year, the cylinder count and displacement. of said engine.
here is a shop manual.. 93-2004 years
If non recently carried out needs a full sevice by KIA professionals. I knoe expensive, well worth the satisfaction knowing it runs right, wil lbe pricey The service should include a tuneup, or you couild have an at home mobile tuneup.
ur problem cud be a tuneup--change or test plug wires--coil--etc/alsoinjectors may need cleanin or u may have vacuum leaks--do a complete inspec and a data stream run to get values-code readers arnt enuff info---------obtain a repair manual for procedures and dont go to a dealer
Codes from the on board readout are: 12 is just telling you that you're accessing the codes. 34 is an open or shorted condition detected in the speed control vacuum or vent solenoid circuits. The IAC (Idle air control Valve) is located on the throttle valve just below the throttle cable attachment. It is held in place with 2 torx screws and has a electrical plug on the end. Try cleaning the inside of the throttle plate of carbon or dirt build up with MAP sensor cleaner or may need to replace the IAC
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