2001 Kia Rio

Tiny
ILAFFI
  • MEMBER
  • 2001 KIA RIO
  • 4 CYL
  • 2WD
  • MANUAL
  • 50,000 MILES
I’ve got a KIA RIO LS TOP purchased in December 2001.

After about two years, very often the yellow check light turned on.
Soon I took the car to KIA Service Centre of my City.
They checked the events memory and diagnosed the problem was caused from the debimeter/ air flow meter malfunction.
They replaced it and the problem was solved.
But not much time after, very serious problems began.

Read below.

a) the minimum RPM is not uniform. The situation gets worse if I use air conditioned;
b) the car runs with speed not uniform. The RPM increases and decreases without to use the accelerator;
c) very often I take away the foot from the accelerator and the RPM doesn’t decrease, even if the accelerator pedal is off. Only after some seconds (5-7) the RPM decreases.

When the mechanic checks the car the computer’s display shows : NO DEFECT.
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Friday, February 15th, 2008 AT 7:19 AM

9 Replies

Tiny
JACK42
  • MEMBER
That means the PCM doesnt see any sensors out of range. Need to check for vacuum leaks. Use carb cleaner and carefully spray around the vacuum lines on the engine, when the idle changes, you have found a leak.
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Friday, February 15th, 2008 AT 7:25 AM
Tiny
ILAFFI
  • MEMBER
Thank you for your prompt reply.
In the past in the garage they used cleaner for MAF e throttle, and some days ago they replaced all the throttle group without success.
They tried to replace the MAF for the second time and this caused the CHECK lamp turned on.
They checked the memory: error P0172 SIST RICC (BANC1).
Then they replaced the previous MAF.
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Sunday, February 17th, 2008 AT 3:45 AM
Tiny
JACK42
  • MEMBER
No vacuum leaks at the intake? If you got a code with the other MAF, I would leave it in and diagnose from there.
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Sunday, February 17th, 2008 AT 8:17 AM
Tiny
ILAFFI
  • MEMBER
Thank you for your kindess.
Can you explain to me what is vacuum leak and what can I suggest to the mechanic to check it?

Bye
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Sunday, February 17th, 2008 AT 11:00 AM
Tiny
JACK42
  • MEMBER
That is when unmetered air is entering the engine through a leak in the intake system. They will know how to look for it
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Monday, February 18th, 2008 AT 7:17 AM
Tiny
ILAFFI
  • MEMBER
Following your suggestion, on Saturday of last week I took my car to the garage. They promptly used a spray to find a leak. They checked around all hoses, MAF and other parts. No leak.

The car has the same problem.

Bye
Ferdinando
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Monday, February 25th, 2008 AT 1:37 PM
Tiny
JACK42
  • MEMBER
Then I would take it to a shop with the ability to put it on a real scanner to watch the sensors working, might be a slow/lazy o2 sensor
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Monday, February 25th, 2008 AT 1:42 PM
Tiny
ILAFFI
  • MEMBER
Some days ago I took my car to the garage, after some tries, they solved the problem replacing the capacitor.
Now the car works well.

However, thank you for your help.
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Monday, March 24th, 2008 AT 6:24 AM
Tiny
JACK42
  • MEMBER
Capacitor?
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Monday, March 24th, 2008 AT 7:30 AM

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