Engine Misfire in Cylinder #3 - I am baffled
My wife just bought a 2001 Kia Rio from a used car dealer. I had it tuned up (new plugs and wires, timing), and new tires at a local national chain mechanic. I also put some Techron in the tank. After a week of having the car, the CEL comes on and I had the code checked at Autozone and it is a misfire in Cylinder #3. I had noticed no change in performance accelerating or at idle. I took it to the national chain mechanic and they showed me a balc spark plug and said it was oilin the cylinder and they did a compression and leak down test shoing very low compression in that cylinder and my engine was basically shot. I took it back to the used car dealer and we took it to the Kia Dealer down the street (where I had incidentally bought myself a 2002 Spectra a week before) and they swore the compression in all cylinders was fine and that the misfire was caused by ill-fitting non-OEM wires. They replaced the wires yesterday, but this afternoon after several trips in the car, the CEL came on again (again, I don't notice any change in power, idle, or acceleration). Again the code showed a misfire in cylinder #3. I had autozone reset the code and drove it home and the CEL stayed off. I am at a loss of what to do next. I am not sure who might be lying to me or what may be causing this. Woudlnt' I notice power loss if the cylinder was constantly misfiring or if the cylinder had such low compression? Can a single misfire set of the light without the integrity of the plug being compromised? I am at a loss.