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View Full Version : 98 silverado engine/misfire



97lt1camaro
08-22-2010, 05:44 PM
98 silverado, 350 vortec, stock ebsides k\n. 110k on it. Recently did cap, rotor, plugs, wires and coil

Issue is that if i let the truck idle, it will throw a code for a misfire on number 5. If i start it up and just drive it with no idle time, i get no engine light.

4623
4624
4625

I pulled out number 5 to find this. Hard white crusty stuff on the plug. However im not losing coolant at all, i figured thats what this meant. I am going through a bit of oil however, at WOT it puffs a lil blue cloud.

Any takers?

96LT1355Z28
08-27-2010, 07:06 AM
That sure looks like coolant but I've never seen it on a plug like that!:confused: