Rio acceleration hesitation - Kia Forum
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#1 (permalink) Old 12-18-2009, 03:11 PM
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Cool Rio acceleration hesitation

I don't have a scan tool,but I thought maybe some one would recognize this symptom. When I accelerate,it hesitates.This happens when I take off from a stop or going very slow. It started a few days after the check engine light came on
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#2 (permalink) Old 12-18-2009, 05:21 PM
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Please fill out your profile, where do you live, it does make a difference because of the climate. What car are we asking about? I assume its a Rio but what year? KIA's are sold allover the world, with many different engines, at this point all anyone can to is shoot in the dark.

If perchance you live in North America I suggest you take you're car to an auto parts store ie; AutoZone, Advance Auto, O'Rielly's, ect and have the codes read, its free in most places and then let us know what the codes are.

This will give us a start in being able to help you.

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#3 (permalink) Old 12-18-2009, 07:10 PM
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Cool Kia acceleration problem

It's a 2003 Kia Rio. The fault code is" 90101".
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#4 (permalink) Old 12-18-2009, 10:54 PM
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I don't recognize the code you furnished 90101 and doing a quick search could find nothing. However it sounds life a random misfire problem being caused by spark plugs that need replaced , be sure to gap the new plugs at .028 to .032, and I would suggest using a std plug by NGK, nothing fancy. Another check is checking the wiring going to the plugs, they are all bunched up together which has the tendency to cause cross firing is they get wet or older and loose some of their insulating properities.

If these do no fix/help the problem check out the coil pack but I would make that as a last resort.

#1 replace plugs with std. NGK plugs gaped at .o28 to .032
#2 check ignition wired, make sure they are completly dry and possibility spray with silicone spray. Lastly, replace with new ones, they really aren't that costly.
#3 check out the coil packs, this is a possibility but not likely.

I looked up your town and area under weather underground and I see no moisture in sight or have been, did you wash/spray off cleaning the engine?

Anyway this is a better start, thanks for the profile help and keep us posted, oh ya, how many miles on the RIO?

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#5 (permalink) Old 12-19-2009, 12:40 PM
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Default Rio acceleration problem

I'm sorry,the code is PO101. I'm assuming it is something to do with the air flow, but I'm not a mechanic. I just can't afford to take it in to a shop right now. I bought a code reader for $50. Thanks for helping. Maybe the right code will help?
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#6 (permalink) Old 12-19-2009, 01:56 PM
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This is a MAF problem "Mass Air Flow". Use the Google engine and google obd II codes po101. It'll give you more info regarding this, it does say that it shouldn't give any drivablity problems. If I knew how to drag the info I found I could help more maybe but I hope this helps.

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#7 (permalink) Old 12-19-2009, 04:36 PM
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Question Rio acceleration problem

I now know that this is due to the maf,[possibly]. I am trying to find out where,exactly, it is located and how to remove it. The code,po101, is kind of vague as to what the problem is. Any advice?
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#8 (permalink) Old 12-19-2009, 06:16 PM
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The MAF sensor is located shortly after the air cleaner filter box. There is spray cleaners available at auto parts stores to clean this item. Be very careful as the fine wires that pickup the air flo are very senistive and easily damaged. Plus this sensor isn't a cheap item.

Hey, at least you're not up here in no. Indiana with 10 inches of snow and temps in the teens.

Keep us posted. jcwit

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#9 (permalink) Old 12-20-2009, 08:40 AM
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You have started down the path of enlightenment with a code reader. It drives me nuts that we have all this tech and alls the makes can do is turn a light on. Reason number 10 I don't buy new cars.

2005 with an avg of 15K that would be around 60K miles.
Changing the air filter would help.
Since most car are auto trans I would also have the trans fluid and filter changed.

Good luck and keep us posted.
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#10 (permalink) Old 12-20-2009, 07:51 PM
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I agree with jcwit. You might have to clean the maf sensor and while your at it, use some throttle body cleaner to clean the throttle body as well.

never under estimate the power of my RIO:cool:
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