2001 Kia Rio

2001 KIA RIO
50,000 MILES • 4 CYL • 2WD • MANUAL
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ILAFFI
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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.
Feb 15, 2008 at 7:19 AM
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2CARPRO JACK
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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.
Feb 15, 2008 at 7:25 AM
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ILAFFI
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[quote:1e41f9a32a="2CarPro Jack"]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.[/quote:1e41f9a32a]

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.
Feb 17, 2008 at 3:45 AM
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2CARPRO JACK
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No vacuum leaks at the intake? If you got a code with the other MAF, I would leave it in and diagnose from there.
Feb 17, 2008 at 8:17 AM
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ILAFFI
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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
Feb 17, 2008 at 11:00 AM
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2CARPRO JACK
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That is when unmetered air is entering the engine through a leak in the intake system. They will know how to look for it
Feb 18, 2008 at 7:17 AM
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ILAFFI
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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
Feb 25, 2008 at 1:37 PM
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2CARPRO JACK
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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
Feb 25, 2008 at 1:42 PM
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ILAFFI
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[quote:5a6aa86c61="2CarPro Jack"]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[/quote:5a6aa86c61]

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.
Mar 24, 2008 at 6:24 AM
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2CARPRO JACK
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Capacitor?
Mar 24, 2008 at 7:30 AM