2002 Kia Optima, Hesitates when I accelerate, have had problems with the belts squeeking and no matter who i take it to or how hard I tighten the belts they loosen again, right now they are not squeeking. Check engine light is on, sometimes it will misfire and the car will buck, I took it to a place and they replaced the speed output sensor, this did not fix it. I replaced spark plugs and alternator, please help.

For 2001-2006 Kia Optima Engine Timing Belt Kit ...

eBay https://www.ebay.ca > ... > Timing Kits
For 2001-2006 Kia Optima Engine Timing Belt Kit with Water Pump 2002 2003 2004 ; Approx. C $415.18 ; Delivery. Free 4 day shipping. Get it between Wed, Nov 22 and ...

2004 Kia Optima Engine Timing Belt Kit With Water Pump

Advance Auto Parts https://shop.advanceautoparts.com > find > 2004-kia-opti...

We currently carry 2 Engine Timing Belt Kit With Water Pump products to choose from for your 2004 Kia Optima, and our inventory prices range from as little as ...

2004 Kia Optima Timing Belt Kits

CarParts.com https://www.carparts.com > ... > 2004 > Timing Belt Kit

Get the best deals on an aftermarket 2004 Kia Optima Timing Belt Kit. Lifetime Replacement Guarantee. Free 60-Day Returns. Order today!
"); background-repeat: repeat-x; display: inline-block; overflow: hidden; position: relative; background-size: 14px 11.4px; height: 11.4px; width: 68px;">"); background-repeat: repeat-x; display: block; background-size: 14px 11.4px; height: 11.4px; width: 62px;"> Rating: 4.3 · ‎27 votes

Kia Optima Engine Timing Belt Kit With Water Pump

Advance Auto Parts https://shop.advanceautoparts.com > find > kia-optima...
Low prices on Engine Timing Belt Kit With Water Pump for your Kia Optima at Advance Auto Parts. Find aftermarket and OEM parts online or at a local store ...

this is caused by the crankshaft position sensor located behind the timing belt. this sensor cuts off the power to the spark plug so the car won't start. it happened with my kia and then everything went fine!
Kamal

Google "DAYCO belt routing guide"

I had 2006 kia optima 2.4 liter LX, I drove 150000 miles plus, it was over 100,000 miles I changed timing belt, and AC belt, alternator belt is still ok, but it was my fault, I did not change crank shaft balance belt, it next to timing belt, this very important, timing belt and crank shaft balance belt must change same time, you set all mark the same positions, you can see all clear marked
if you had OBD2 scanner is helpful to read all faulty codes if you do it your self repair
if you have any problems about KIA optima, please post on any websites, to share some ideas to other KIA optima owners, like me, I change oil every 2500 miles to make my optima runs smoother
automatic transmission fluid change every year if you put high mileage on your car, optima had hard time to find it own part some time, radiator hoses are still good condition and had hard time to find in any auto part stores in my home town, good luck and thanks for sharing.

Hello css_trish and thank you for asking your question here on fixya.com.

I have actually written a general information article that will walk you through the general process of changing the fan belt on your 2002 Kia Optima. It will also point you to the resources you need for getting the diagrams of how the belt needs to go back on.

Here is a link to that article:
How to change the fan belt on your 2002 Kia Optima

If this has helped you in any way, then feel free to follow my Twitter account for more great money saving tips and tricks. twitter.com/acoates23234
I follow back, too. :)

Thanks for reading.

3 possible problems your mass are flow meter/senso could be going bad but not bad enough to register a fault, the same for your idle air valve and also your throttle position sensor. all 3 of these are on your throttle body .
with the engine running tap the side of the mass air flow with the back of a screw driver, if the engine sputers mass air flow needs replaced.you can try cleaning it with some mass air flow cleaner if you cant find that at your auto parts store get some electrical parts wash. your idle air valve needs to be cleaned or replaced there hard to get off. your throttle position sensor , you need to know the setting ,if the auto parts store cant give you aprint out of instuctions best to let a kia dealership do it and pay out the ****.

Not sure what engine you have , but I had an 02 rio with the 1.5 L . The serpentine belt did not have a tensioner (spring loaded) pulley , the belt tightness was adjusted by pivoting the alternator mount.
If you are takling about the Timing belt , the tensioner pulley wont move (even though it is on a spring ) untill you loosen the bolt in the center.

check the alternator belt tightness, alot of the problems are caused by this :)

listen for the noise with the bonnet up, think you will find its the alternator belt squeeking or maybe a tensioner :)

It has to be located just above the belt near the power steering pump. Common sense will let you know that the tension bolt will tighten or lossen the belt.

This could be a timing belt as well. have they looked at that as possibility. Sometimes the belt just jumps teeth causing it to still run just not correct.

Please reference the below as well as post reply if this doesn't help

Thanks
rob

Kiatechinfo.com will get you all the information you need when working on a kia 2nd only to a chiltons or haynes manual.

For kiatechinfo.com register (its free) then select the information for your car make model engine. Then either do a search for timing belt or pick from proper items in cloumn to the left.