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Hello, I'm a related member on 4x4.... :D

98 sportage 2 wd w/80K

just as the engine reaches operating temperature, it starts missing, and this lasts for about 5 minutes. After that, it runs fine. Couldn't get my 'autotap' to read the code that was set (anyone else have an autotap problem?), but AutoZone to the rescue. That #4 misfire was set.

I was thinking coil going through a temp range?? ....but of course the closed loop timing could be an issue. I just can't explain why it only lasts for 5 minutes or so??

New plugs and wires at about 72K.

any thoughts??? ~Rob

if I could get the autotap to read, I'd be able to drive with the laptop goin'....SH*t
 

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Either the coil over cylinder 4 is bad OR the valve cover gasket is leaking internally into number 4 plugwell. In which case you'll have to replace the coil anyway since it will be oil saturated.

Pull the coil and check for oil. Also make sure the plug itself is OK. If no oil and the plug is OK then just replace the coil. If oil present replace the valve cover gasket as well as the coil.
 
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