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Kia Sedona EX: I have a 2009 Kia Sedona EX. For about 3 months…

I have a 2009 Kia...
I have a 2009 Kia Sedona EX. For about 3 months my car has been hiccuping. For instance, you can be driving down the highway at a constant speed and it will feel like you let off the gas and then got back on it. The "hiccup" is very slight and barely noticeable most of the time. It also hesitates when taking off from a stop. You can press the gas, it will take off very slow for a few seconds and then it will kick in a almost throw you back it takes off so fast and kind of jerky. It did cause code P0175 to show on the check engine light, but has since turned itself off and no trouble codes are shown. I've already replaced the Mass Air Flow sensor, but that did nothing to help. A mechanic friend said that it sounded like a fuel pressure problem. Any help/advice would be greatly apprecatied!
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Answered in 1 hour by:
12/22/2013
Kia Mechanic: FlatRate572, KIA MASTER ELITE replied 8 years ago
FlatRate572
FlatRate572, KIA MASTER ELITE
Category: Kia
Satisfied Customers: 211
Experience: ASE certified,KIA Master Elite,10+ years KIA experience
Verified
I'm ready to answer your KIA questions right now.
When was the last time your vehicle was at a Kia dealer? There are many ECM and TCM software upgrades that have been released in the last few years, some of which address symptoms like you describe.
If you are under warranty, these upgrades can be done at no cost to you. If you are out of warranty, the charge to perform the upgrades will depend on the amount of upgrades you have to do. Somewhere between a 1/2 hour labor to 1 hour labor, to perform all of them.
I would recommend having these software upgrades done before investing any more money in parts that may not be needed.
Thank you
FLATRATE572

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Customer reply replied 8 years ago

The car say bought used from a kia dealership in February so I'm not sure if they would have done any other diagnostic work in it. Another symptom is that it idles rough. Seemingly more so from a cold start.

Kia Mechanic: FlatRate572, KIA MASTER ELITE replied 8 years ago
I would check for any upgrades needed at the dealer. I am pretty sure there is a idle quality improvement upgrade out there for your vehicle.
FlatRate572
FlatRate572, KIA MASTER ELITE
Category: Kia
Satisfied Customers: 211
Experience: ASE certified,KIA Master Elite,10+ years KIA experience
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