Losing acceleration and no throttle response - Kia Forum
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post #1 of 29 (permalink) Old 02-15-2011, 06:27 PM Thread Starter
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Losing acceleration and no throttle response

I'm losing throttle response at a much lower RPM than I was. The problem started suddenly, not gradually. The MAF looks good and I checked the TPS and got a steady graduation of resistance but I'm not sure what the Ohm range is supposed to be it was reading between 1.5 and 2.2 ohms with the multimeter set to 20K. When I opened the throttle by hand I held it wide open and it revved up some and then began to fall almost back to idle before it picked back up all the while I was holding it open. Also, its idling high. The check engine light came on when this problem started and i had the codes read and got 172, 121, 170, and 101. If anyone knows what the ohm range is supposed to be for the TPS or any other information that could help with this problem it will be greatly appreciated.

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post #2 of 29 (permalink) Old 02-15-2011, 07:10 PM
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Don't know what year and model you have but here is some good info Kia Global Information System (KGIS) will help with your problem. Service manual info just like techs at dealership get its free just have to register. Please fill out your profile this will help everybody on site to help you better good luck. My 02 rio book says ohm readings TPS (0.71~1.3kohms) @ idle 0.3-0.9v. (2.2~3.4kohms) @ full open 4.0-4.4v for code 121. 101 code is for maf 170 and 172 point to tps and maf hope this helps
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post #3 of 29 (permalink) Old 02-18-2011, 03:17 AM
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same problem here, i ran a bottle of octane booster as well as performance gas and it cleaned up my system, only cost $5 for a bottle and the car is as good as new
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post #4 of 29 (permalink) Old 04-17-2011, 06:43 PM
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Quote:
Originally Posted by Citanul View Post
I'm losing throttle response at a much lower RPM than I was. The problem started suddenly, not gradually. The MAF looks good and I checked the TPS and got a steady graduation of resistance but I'm not sure what the Ohm range is supposed to be it was reading between 1.5 and 2.2 ohms with the multimeter set to 20K. When I opened the throttle by hand I held it wide open and it revved up some and then began to fall almost back to idle before it picked back up all the while I was holding it open. Also, its idling high. The check engine light came on when this problem started and i had the codes read and got 172, 121, 170, and 101. If anyone knows what the ohm range is supposed to be for the TPS or any other information that could help with this problem it will be greatly appreciated.
I have a similar issue. Throttle response goes away at about 2000rpm. Can't accelerate any faster than that rpm will allow in any gear. Acts like it's starving for fuel. Engine never stalls and will start and idle fine.
Fuel filter has been replaced and no engine light is on. MAF sensor was replaced about 2 months ago in response to engine code at that time.
Now, I'm thinking TPS but don't know how to check it or even where it is to replace it.
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post #5 of 29 (permalink) Old 04-19-2011, 04:14 PM
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Sounds like you have a plugged cat if the car will not accelerate above 2000rpm, or possibly a plugged fuel filter.

2004 Kia Rio - Garrett GT28R - 1.4 Bar
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How's that for Power to Surprise.
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post #6 of 29 (permalink) Old 04-20-2011, 07:04 PM
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Easy answers

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Originally Posted by 2004riotuner View Post
Sounds like you have a plugged cat if the car will not accelerate above 2000rpm, or possibly a plugged fuel filter.
Those are the obvious things. Some other things that have been checked or replaced:
MAF sensor
Fuel filter
Spark plugs
crankshaft position sensor

Put on your thinking caps and get creative.
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post #7 of 29 (permalink) Old 04-23-2011, 04:42 PM
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Start with easiest checks first

I am a newbie at Kia's, but have been a car tinkerer for years, and right up front, this sounds like an air leak, or possibly some bad wiring. Run the car and spray some carb cleaner around the intake manifold and see if idle doesn't change indicating a leak. Your error codes sound totally cross related as if you have some bad wiring to ECM, so check for damage or bad grounding on all sensor wires/harnesses. Clean the MAF if you haven't already (especially if you use an oiled filter). Good luck, all those codes together is confusing. o2 says too rich...TPS has fault...fuel trim out of range...MAF has error... hmmm.
The possibilities are endless.... My best guesses are: intake leak, bad MAF sensor, timing off, or plugged exhaust system (cats).
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post #8 of 29 (permalink) Old 05-06-2011, 01:30 PM
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Update

Mine had no check engine light, hence, no codes to check. The first shop I went to spent 3 days swapping out parts in hopes of fixing the problem.
On my way to the second shop, the engine light came on and logged the following codes: 116, 121, 140, 101. The MAF had already been changed and the other issues were checked and no problems found. The shop reset the computer and now it runs fine. Go figure!
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post #9 of 29 (permalink) Old 05-10-2011, 12:55 PM
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2001 Kia Rio - Idles great, but as soon as you give it a normal foot pressure to accelerate it will hesitate and then drive on.. I even driven on the highway and when I slow down and try to boost back up it will hesitate again... My engine light codes say MAF sensor. But it did that over the winter and I changed the plugs, wires and run fuel cleaner in it.. it worked.. but now its doing again, Its Spring!
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post #10 of 29 (permalink) Old 05-10-2011, 10:47 PM
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I'd clean the MAF sensor and replace the injectors if you have the money. Rebuilts are about $40 each. Of all the things I have done to my Rio, I found throttle body cleaning, new(rebuilt) injectors, and gapping the plugs at .026 worked the best. Injector cleaner helped but takes too many tanks to get good results. I am still searching for better mileage, but at least it runs good. And all the above are easy fixes you can do yourself.
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