01 kia rio cylinder misfire

[dennisspeaks]

I've got the kia blues. I've got the blues for awhile. Every so often the engine check light would come on and go off before I got the chance to check it. Today whil on the freeway it came on and started runing really rough while on eht freeway. I went and checked it and it said cylinder 2 misfire P0302... Fuel system 1 closed loop calculated load 36.8%.

Can anyone tell me what this means as far as the closed loop. The guy at Schucks said the misfire is because of spark plug or sp wire.

This is probably unrelated to my ignition problem where i would have to recycle the ignition sometimes multiple times to get the fuel pump to kick in. Thanks. Dennis

[Mynewrio5]

Something like this just happened to my brand new 08 Rio 5 LX (only 3000 miles). The Check Engine light came on and the Kia dealership read P0300, P0302, P0304, P0302, P0304. They diagnosed everything listed under the tech forum (http://www.kiatechinfo.com/default.asp) and concluded that my choice of gasoline is the problem. I've been using Regular (87 oct) that, in Oregon, is 10% Ethanol during the winter months (HORRIBLY affecting the gas mileage, no matter WHAT the government says). Kia suggested that I use a better quality regular or upgrade to a higher octane. They also stated that this problem plagued earlier Rio models and that the company created a software/firmware fix for the onboard computer. They are working on a fix for the 08 models. None too soon as I bought the Rio to save $$$ on fuel costs.

[robhynes]

Start with the obvious first, pull that spark plug and check it, make sure it's in good shape... The exact same thing happened (on plug 2 btw), CEL came on and was running like crap. My valve cover gasket sprung a leak and started filling the plug hole, arced out.