I have a 2002 kia optima with a 2.4 L I just changed out engines don't know the history of this car the engine I put in has 60'000 miles on it when I first started it the idle was real low so installed another idle control valve and didn't idle at all I am thinking I have a bad tps sensor due to when it did idle I seen black smoke out the exhaust or still could be a bad idle sensor still I will put the old egr valve on it and all the other sensors off the old engine on it
Black smoke usually means burning too much gas. The problem is the IAC idle air control. I would also replace the TPS
SOURCE: Check engine lite says the Throttle Postion Sensor is Bad
The TPS is usually located on the inlet manifold at the rear of the engine.If you look at where the accelerator cable connects to the throttle housing it should be there. It's held on by 2 torx or hex head screws & has a wiring block connector with 3 wires going in to it. This connector should simply pull off when you squeeze the clasp. You didnt say which engine you have but the TPS is similar across the range. You must make sure the ignition is off when unplugging it otherwise you will generate a fault code in the Engine Managment System. Once replaced switch the ignition on for 5 seconds & then switch off. This should position the sensor ready to start the engine.
SOURCE: 2000 kia sephia constant engine stalling!!!
try this procedure and let me know if it cures the problem.
Here is the common cause of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
SOURCE: 2008 Kia Optima Check Engine Light
Just replace the air flow meter.That sounds like your problem.
SOURCE: 2008 kia optima LX Check Engine Light
P0442 EVAP Leak Monitor .040 Leak Detected (Medium Leak)
P0456 EVAP Leak Monitor .020 Leak Detected
replace your gas cap and clear codes, then wait and see if light comes back on, if it does you have a more serious problem like a fuel tank leak or a defective fuel tank pressure sensor.
SOURCE: 2002 Optima: where is the speed sensor on a 2002 kia opitma...
The speed sensor is located on top of the transmission Just under the Air Filter. So you will have to remove the Air Filter and you will see your two main sensors (I/O sensors.) .
For more detail-----------
If you remove the air filter and look down on top of the transaxel, you'll see a couple of connectors that lead to sensors that are inserted into the transaxel. The Output Speed Sensor is the one towards the rear of the car, towards the driver. The Input Speed Sensor is the one a little hidden under a diagonal cable (with a boot covering the cable) right in front of your face.
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