Kia Troubleshooting Questions? Ask a Mechanic
Hi, I’m Cary and I’ll be helping you today.Please understand that I can't smell, hear, or touch the vehicle, so patience is appreciated. Before leaving the site make sure and leave me a rating. You can still reply to me as many times as needed, even after the rating..
Are there any codes/check engine light?
Do you have a scan tool that will read sensor values?
What about the coolant temp sensor? Is it reading correctly when the engine is cold and then steadily increases as the engine warms?
Have you checked the coolant temp sensor?
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I assume there are no DTC's. Can you tell me the long and short term fuel trims are while it is cold and acting up?
I will opt out to see if another expert can help.
Hi Im David, let me pull up some info from my resources, ill get back with you. thanks.
is the coolant temp sensor fails and sends a false signal to the engine management so the fuelling is adjusted to compensateusually they fail "cold" so the management makes the engine run rich (choke on)but if they fail "cold" then the mixture is weaker which makes starting and cold running poor but runs fine once warmed up
check the voltage at the fuel pump connector. if its not putting out a full 12vdc, that could be your issue. and check the ground for the pump. take the ground off. clean it, burnish the mount area and reconnect it.
ok gimme a sec
how long does it take for the system to go into closed loop?
ok then you have either a bad o2 sensor heater circuit or the ecm that sends the signal to heat them
any luck checking the heater circuit for the sensors?
ok keep me posted
if its taking 8-10 minutes to go to close loop, thats insane, let me look at something else
what are the readings of the rear o2 sensors?
ok. damn. have you down a back pressure test?
also has a vacuum leak test been done... something is letting unmetered air in until it warms up and seals the ares where its coming in.......i would imagine it would have to be done cold though
sure. hey i have a couple cars here in my shop that could use the gas and match fix...
geez.....ok. let me figure this out
i think the dam computer isnt responding to the o2 sensors.
i hear ya, but if you look at a print, where does the control for the o2 sensor heater come from. plus. everything else is testing normally.
if the vehicle is running lean after sitting all night, and it takes 8-10 minutes to go into closed loop. and the reason the o2 sensor gets heated is to minimize open loop time and that is control by the ecm...???
i hate condemning a computer too, but if it walks like a duck.....
as long as it has the exact same part number might be just what the doctor ordered