Question about 2003 Kia Rio

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Acceleration Problem I was driving today and my car started to decelerate around 60mph. I tried flooring the gas pedal and it kept decelerating until it reached 55mph, then it chugged a little, started to accelerate up until 60mph and then would not exceed 60mph. Once I came to a full stop it would not exceed 15mph in Drive or 25mph in Drive 2. I have recently replaced my mass air flow sensor, throttle position sensor, and coil pack. What could this be?

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  • Expert
  • 54 Answers

Could be fuel pressure or a blocked fuel filter. need more test information,

Posted on Jan 17, 2013

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

tepfy
  • 319 Answers

SOURCE: Car wont shift properly

sounds more like a vacume problem than a sensor, but the way I would start is go threw all the vacume lines you can. they are easy and very cheap to replace. check for any insignificant defect cracks warps distortions in the line. Anything. Then remove your air filter intake line to the throtle body. remove the throtlebody its only 4 bolts and usualy to sensors. The throtle body may just be dirty, clean it out inside and out. Then chek you aire intake sensor, sometimes its called an idle sensor, last check the throtle body sensor. Also if you still have your old mass airflow sensor clean it up with the proper mass air flow cleaner and return the new one. Because obviously it wasn't the problem.

Now is the time I tell you all about proper maintenace. Did you replace your air filter, when is the last time you changed your plugs and wires. I really like the bosch platinum 2 plugs. They burn a litle hot but not to hot, which means more burn and cleaner, less emissions. Hint hint to you that have to pass a emissions test every year.

You may want to go on utube and check out a product called Seafoam. I have had a lot of success with this product. It goes in your gass tank in your oil, and the third part goes in your vacume going into your injectors. It does clean a lot of **** out of your car. But I warn people that this is a at your own risk kind of thing. I know how to take my engine apart and fix it do you. Because I wont come to your house and rebuild your engine if you mess it up. Sorr for the rant but l have to give that litle disclaimer out.

After you have worked on all the things I have told you I believe you will have fixed your problem, if there are any problems or questions send me a message and let me know.

Tepfy

Posted on May 01, 2009

  • 84 Answers

SOURCE: Hesitates upon acceleration & will not maintain a steady speed

i had found a problem with a kia rio. it was saying tps sensor but after a couple of hours and alot of cursing it turned out to be the maf mass air flow sensor. these are expensive so i suggest that you take it to a kia dealer to have it tested or find someone who can do it for alot cheaper

Posted on Apr 28, 2009

  • 20 Answers

SOURCE: Check engine light comes on when heater or fan is used 2000 Kia

sounds like a blockage to the heater matrix ,not a job for us enthusiasts,might involve front dash removal to accses it.although an engine reverse flush could do the trick.

Posted on Jul 22, 2009

  • 257 Answers

SOURCE: 2004 kia optima arcing around the coil pack

the coil pack mybe bad

Posted on Aug 11, 2009

terseo
  • 92 Answers

SOURCE: car makes belt slipping noise

You need to tighten the belt or replace it.

Posted on Sep 24, 2009

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PROCEDURE 1
EVAPORATIVE EMISSION SYSTEM LEAK MONITOR
Inspection Conditions
Engine coolant temperature: 30°C (75°F) or less (The engine is stopped before the test drive is started).
Atmospheric temperature: 5 - 30°C (41 - 113°F).
Condition of A/T: Selector lever D range.
Fuel remained in fuel tank: 30 - 50% is recommended.
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Drive cycle pattern: One trip monitor (from start to ignition switch to "LOCK" (OFF) position. Well be completed while traveling with the following drive cycle pattern.
Test Procedure
Engine: start.
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While keeping the accelerator pedal opening degree constant, keep the vehicle speed at 89 km/h (55 mph) or more and travel for 16 minutes.
Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.

PROCEDURE 2
FUEL TRIM MONITOR
Drive Cycle Pattern
Inspection Conditions
Engine coolant temperature: 100°C (212°F) or less.
Atmospheric temperature: -10 - 60°C (14 - 140°F).
Condition of A/T: Selector lever D range.
Time required: 30 minutes or more.
Drive cycle pattern: One trip monitor (from start to ignition switch to "LOCK" (OFF) position). Will be completed while traveling with the following drive cycle pattern.
Test Procedure
Engine: start.
Accelerate until the vehicle speed is 89 km/h (55 mph) or more.
While keeping the accelerator pedal opening degree constant, keep the vehicle speed at 89 km/h (55 mph) or more and travel for 30 minutes.
Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position

PROCEDURE 3
CATALYTIC CONVERTER MONITOR
Drive Cycle Pattern
Inspection Conditions
Atmospheric temperature: -10°C (14°F) or more.
Condition of A/T: Selector lever D range.
Engine coolant temperature: Not set.
Time required: 16 minutes or more.
Drive cycle pattern: One trip monitor (from start to ignition switch to "LOCK" (OFF) position). Will be completed while traveling with the following drive cycle pattern.
Test Procedure
Engine: start.
Accelerate until the vehicle speed is 89 km/h (55 mph) or more.
Travel for 300 seconds or more while keeping the vehicle speed at 89 km/h (55 mph) or more.
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While traveling at 56 - 80 km/h (35 - 50 mph) for 10 minutes or more, fully close the throttle at least once in 2 minutes and decelerate for 10 seconds or more.
Do not repeat deceleration too often.
Vehicle speed may go below 56 km/h (35 mph) after the deceleration.
Stopping and braking are permitted. (If stopped or drive at 56 km/h (35 mph) or less for more than 5 minutes the monitoring may be stopped. In this case please restart monitoring from the beginning.)
After completing the above deceleration, bring the vehicle speed back to 56 - 80 km/h (35 - 50 mph) and keep it in the range until starting the deceleration again.
Repeat the above deceleration at least 5 times.
Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position

PROCEDURE 4
HEATED OXYGEN SENSOR MONITOR
Drive Cycle Pattern
Inspection Conditions
Engine coolant temperature: 100°C (212°F) or more.
Atmospheric temperature: -10°C - 60°C (14 - 140°F) or more.
Condition of A/T: Selector lever D range.
Time required: 16 minutes or more.
Drive cycle pattern: One trip monitor (from start to ignition switch to "LOCK" (OFF) position). Will be completed while traveling with the following drive cycle pattern.
Test Procedure
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Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position

PROCEDURE 5
EXHAUST GAS RECIRCULATION (EGR) SYSTEM MONITOR
Drive Cycle Pattern
Inspection Conditions
Engine coolant temperature: 100°C (212°F) or less.
Atmospheric temperature: 5 - 60°C (41 - 140°F).
A/C switch: OFF.
Condition of A/T: Selector lever D range.
Time required: 16 minutes or more.
Drive cycle pattern: One trip monitor (from start to ignition switch to "LOCK" (OFF) position). Will be completed while traveling with the following drive cycle pattern.
Test Procedure
Engine: start.
Accelerate until the vehicle speed is 56 - 80 km/h (35 - 50 mph).
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PROCEDURE 6
OTHER MONITOR (Main Components, Sensors & Switches, Wire Breakage & Short Circuit)
Drive Cycle Pattern
Inspection Conditions
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30°C (86°F) or less (Engine coolant temperature sensor monitoring).
Atmospheric temperature:
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A/C switch: OFF
Lights and all accessories: OFF
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1 Answer

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