Kia optima 03' won't accelerate... - Kia Forum
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#1 (permalink) Old 07-14-2007, 06:53 PM
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Default Kia optima 03' won't accelerate...

At first it would shut off immediately when I started it up, since I was broke I kinda kept driving on it by just accelerating when I started it up right away and eventually it warmed up and stayed alive until it cooled down. Now the bigger problem. Driving on the freeway going a good 80mph my car stopped accelerating completely. Don't know why. Before I replaced any parts it would not go above 5-6mph's. Now that I've replaced the O2 sensor, and the MAF sensor, it seems to get up to a maximum speed of 40mpg using the manual part of the car but it still does not accelerate well. And with the automatic it feels like it struggles with it.


Honestly I've no idea what to do with the car, and its 3k miles over the 100k warranty and with money being tight hopefully someone has SOME idea of what might be wrong.
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#2 (permalink) Old 07-17-2007, 12:40 PM
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You did not give us much info to work with, but here goes....

First things I would check:
- Are you getting a good spark? (may need to replace plugs and wires)
- Are you getting enough fuel? (might be as simple a a good injector cleaner or fuel filter replacement, or as complicated as a failing fuel pump)
- Are getting enough air? (check the air filter, might need to clean the throttle body)
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#3 (permalink) Old 07-23-2007, 05:03 PM
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Quote:
Originally Posted by joebunda
You did not give us much info to work with, but here goes....

First things I would check:
- Are you getting a good spark? (may need to replace plugs and wires)
- Are you getting enough fuel? (might be as simple a a good injector cleaner or fuel filter replacement, or as complicated as a failing fuel pump)
- Are getting enough air? (check the air filter, might need to clean the throttle body)

Sorry cars aren't my thing. But spark plugs have been replaced, did the fuel filter replacement and cleaner, air filter has been replaced. Just replaced MAF, it now gets up to 50mph, but its difficult and shakes and I actually have to manually shift the gears because in automatic it does not shift to transfer to the next gear properly.
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#4 (permalink) Old 07-24-2007, 12:43 PM
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Do you notice any odd smells after driving a bit? Can you describe the shaking more? When you shift manually, does it shift smoothly?

If we exclude the tranny for now, my next thoughts are in the drive train.
- siezed calipers
- wheel bearings
- warped rotors
- bent half-shaft
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#5 (permalink) Old 01-01-2008, 06:35 PM
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i have a 2001 magentis/optima lx v6 automatic. i am having what sounds like similar problems that only happen sometimes. when i start out from 0 it will shake till it gets a lil speed. then when i try to quickly accelerate it will get caught up between gears( my rpm will raise and my speed will decrease), to get it to complete the shift i have to let off on the gas like you would a manual tranny then resume like i was. this will do this as it shifts between every gear. however it only does it sometimes when i quickly accelerate not if i slowly gain speed
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