01 rio must warm up or it dies & bogs - Kia Forum
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post #1 of 21 (permalink) Old 04-07-2010, 12:31 PM Thread Starter
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Default 01 rio must warm up or it dies & bogs

We have an 01 kia rio that we have put alot of money into. After dropping $600 on replacing the front Catalytic converter and O2 sensor it ran better. Problem is you have to let the car warm up for several minutes or it won't run. I mean you step on gas it idle drops and dies. It stumbles, bogs down, and will just die if you try start it and drive off. Doesn't matter if its 10 or 80 outside, this car will not go anywhere unless it warms up. Then it drives fine.

We pull codes, we clear codes, and it never gives up anything. Only code it has dropped since we had work done is P0172. We even replaced the MAF thinking that would help. Nope, did nothing.

Only thing we can come up with is the Throttle Position Sensor. Any help would be awsome. The car does hesitate when driving it, almost like its not getting gas or air at times. Feels like a nice steady rocking horse when its doing it.

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post #2 of 21 (permalink) Old 04-07-2010, 12:48 PM
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I would check for intake vacuum leaks, and make sure there's no leaks in the intake tube between the MAF and TB.

Quality and not quantity counts.

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post #3 of 21 (permalink) Old 04-07-2010, 03:24 PM
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Are you doing all this yourself or is this what a mechanic/dealer is finding? If its you have you tried taking it somewhere and see what they find ? Sometimes another pair of eyes can help.


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post #4 of 21 (permalink) Old 04-07-2010, 05:27 PM
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Did you replace wires or plugs and if so with what kind and gapped at what.

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post #5 of 21 (permalink) Old 04-07-2010, 05:55 PM
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if it dies, bogs up, it means either too much fuel or air leak.

check exhaust for smell and gases color (if they smell with gasoline and are dark, grayish - too much fuel). too much air will not cause too much color...

how about after reaching operating temp? how does it behave? does it have power and all?

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post #6 of 21 (permalink) Old 04-07-2010, 06:16 PM
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Quote:
Originally Posted by PLP View Post
if it dies, bogs up, it means either too much fuel or air leak.
This was my thinking, and the fact that it runs OK when cold, when the ECU is set for a rich mixture, and then bog's down when warm, made me think of a vacuum leak causing it to be too lean, but not too bad when still running on the cold start rich mixture.

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post #7 of 21 (permalink) Old 04-07-2010, 07:00 PM
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lets clarify the problem.

COLD - idles fine, but dies when you try to drive it
HOT - runs, idles all right.

It was my understanding.


And just general thing - why most of the people are trying to play with the most complex repairs first, instead of trying to check all the basics. For example - loose wires, spark gaps, replace spark plugs in case one was broken, clogged air filter... many things before replacing MAF, TPS, ECU...

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post #8 of 21 (permalink) Old 04-07-2010, 07:26 PM
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Quote:
Originally Posted by PLP View Post
lets clarify the problem.

COLD - idles fine, but dies when you try to drive it
HOT - runs, idles all right.

It was my understanding.
I got it ass about face !!

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post #9 of 21 (permalink) Old 04-07-2010, 08:19 PM
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Slightly bad ignition cables with moisture on them? Engine cover looks nice but can cause condensation on the wires. Happened to me!

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post #10 of 21 (permalink) Old 04-07-2010, 11:01 PM Thread Starter
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We have taken the car to multiple mechanics. They changed wires, plugs and after 3 differant places they found the front CatConverter was plugged. Others kept checking back one, and it was fine. They replaced O2 sensor since they broke it trying to remove it. They checked timing and all was good. Since the CC was replaced we have power and drives good if you let it warm up several minutes. When car is first started the idle is rough, raises, lowers and then when it steadies out, your ready to drive.

Sometimes when driving you get a stutter, happens when you ease off gas. Its a slight hesitation when you let off gas, then step back on gas. Almost as I said before, a rocking horse motion. It keeps going, power doesn't really drop.

We recently changed fuel filter, MAF. I bought the car new and have always kept up on maintenance. This is frustrating, and small towns are not the best places for kia rio repairs.

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"150,000+ and going strong!"
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