Question about 2003 Kia Rio

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I have a 2003 kia rio with a misfire on #3 cilinder does anyone have any ideas????? I tried the coil pack didnt help??????

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It was the ignition coil on mine.

Posted on Nov 30, 2011

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Also check the compression . you can rent a cylinder compression tester from autozone. you could also do a leakdown test by getting an adapter that screws into the spark plug hole and fills the cylinder with compressed air and allows you to hear where its leaking weather from the oil cap or the exhaust or intake.

Posted on Jun 20, 2009

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I would check the sparkplug first, then the timing. Do you get any spark at all at # 3 ?

Posted on Jan 24, 2009

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SOURCE: have a 2003 kia rio with a misfire on #3 cilinder

first thing to do is clean the throttle body. kia even has a tech bulletin on it and missfire codes along with all sorts of others are caused by a dirty throttle body

Posted on May 19, 2010

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Random multiple misfire P0300, P0302, P0304 on 2006 Kia Rio


A competent mechanic will check all probable causes associated with these DTC codes.
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Be sure the invoice enumerates all of these probable causes as having been checked. Also, some of the replacement parts installed earlier may be faulty.

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Kia sedona 2003 not firing on #3 cylinder


With the vehicle running remove the plug for the fuel injector for cylinder #3. RPM should drop. If you have access to nous lights plug one into the injector plug and make sure it flashes. If no flash either the wiring is open or grounded or the computer is not commanding it on and off. You should also look at the cylinder compression. Make sure plugs aren't cracked, are correctly gapped, and no carbon tracking.

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Have a 2003 kia rio with a misfire on #3 cilinder does anyone have any ideas????? I tried the coil pack didnt help??????


first thing to do is clean the throttle body. kia even has a tech bulletin on it and missfire codes along with all sorts of others are caused by a dirty throttle body

May 19, 2010 | 2003 Kia Rio

2 Answers

Engine misfires


You didnt mention having changed the spark plug wires, so that is another item that could be culprit as well. As well, it could be a coil pack that is not working properly.

I cannot recall at the moment if that model year uses coil on plugs or if it uses coil packs. Either way, if it uses a coil on plug set up, take the one for the #3 cylinder and move it to say #4 or anyone of your choice and see if the misfire follows

If it uses coil packs, there is likely one coil pack that controls two cylinders. In that case just swap the coil pack with an adjacent one and see if the problem follows. Pay attention to where the spark plug wires go because it will be an issue if you get them mixed up. You just swap the coil packs around.

I would, however, start with the spark plug wires if you have not changed them already.

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