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Old 07-30-2012, 09:54 AM   #1
ZSTi
Scooby Newbie
 
Member#: 175439
Join Date: Mar 2008
Chapter/Region: RMIC
Location: Colorado
Vehicle:
2007 RS 4
Phantom Black

Exclamation Misfire in cylinder 1, help!

Hello guys, I have a question on my commuter car that I can't get much help with on any other forums so I figured I would try to ask it here. I have a 2008 KIA Rio LX with 47,000 miles. I bought it with the check engine light on, so I took it to Autozone and they said it was a misfire in cylinder 1. The car runs fine when driving although does have a lack of power, but while idling it runs a little rough. When I first start it the check engine light blinks for about 15 seconds then stays solid. So the first thing I did was pull the spark plugs, the plug in cylinder one had black residue on it so it was replaced but fouled out almost immediately. When I pulled it back out there was a small amount of oil on the threads. So next I did a compression test. The compression in cylinders 1 and 2 were the same and 3 and 4 were also the same, I forget the exact numbers but they were less than 15% off from each other I believe. Next I cleaned out all injectors with a tank treatment, then replaced injector number one while also putting in a new spark plug. That made no difference, then I replaced the valve cover seal and it also came with seals that go around the spark plug tubes. So, none of this worked. The only thing I can think now would be a valve guide seal or a piston ring but I am not sure any more. Also, my gas mileage is still amazing, and it doesn't burn any oil and I've been running it like this for two months and it still runs fine other than idling. Any help would be appreciated thanks!
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Old 07-31-2012, 01:27 AM   #2
yarrgh
Scooby Specialist
 
Member#: 80465
Join Date: Jan 2005
Chapter/Region: RMIC
Location: Aurora, CO
Vehicle:
2001 2.5RS
Black Diamond Pearl

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Replace one thing at a time. Can you swap spark plug wires? Do this and see if the misfire changes cylinders. Then move to the injectors. Swap and check for code movement. Check for vacuum leaks. Check for exhaust leaks.
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