Question about 2007 Kia Optima
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Posted on Jan 02, 2017
Even though the fuel filter and pump are easy to replace, I would start with the IAC sensor first. It is easier to get to and is cheaper than the other two if you can find one at a wrecking yard (should be around $20). This sensor is the Idle Air Control sensor, and the computer decides how much throttle to give at idle from the readings of the sensor. If it is bad your car will idle poorly or not at all.
You can verify this two simple ways:
1. Disconnect the sensor completely and see if anything changes. If you get the same issue, then it's probably the sensor. If different then it could be fuel delivery.
2. With it all hooked up; try throttling the engine yourself at 1000-1200 rpm and see if it is smooth. If it is then it is probably the sensor. If not then could be the fuel delivery.
The sensor is under the silver and black, plastic KIA cover over the engine (4 small nuts to remove), and is center above the engine on the front side of the intake pipe.
The part looks like this:
If it seems to still be fuel delivery, the filter is (facing the engine from the front of the car) down to the left and toward the back attached to the fender well (Just to the right of and below the battery)
Posted on Jul 12, 2009
SOURCE: When I stop at a
Change your crankshaft sensor located behind lower timing belt cover. The way I check it is to unplug the maf and see if it will start if so stop the engine and do a diagnostic 3 DTC's should come up on screen ,one would be the crankshaft sensor. This should be done by a experienced tech.
Posted on Feb 28, 2011
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Jan 05, 2016 | Kia Cars & Trucks
Sounds like you have a wheel bearing problem. Jack up the front end so wheels are off the ground. put your hand on the spring on the strut then turn the wheel with the other hand. If the bearing is bad you will feel the vibration/rough spot in the spring. Noise will get louder or diminish when you peed up or slow down.
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