allomiamigo. Contrary to internet myth, “spark plugs and coil packs” are not a misfire cure-all. Oil on the spark plug may be just dripping off the top somewhere or a different problem is leaky valve seals/rings etc. I drove it around the neighborhood and the ses light came on. I want to change the spark plugs in my 2003 Forester. Hey, everybody today I changed my spark plugs and it was my first time ever to do this. According to AA1Car.com, this occurs when the spark plug fails … A common malfunction is a wet spark plug. By Deanna Sclar . After putting everything back together, I start the engine and it had a small misfire. Several months back my car was experiencing sputtering, weak acceleration (in the lower gears) and poor power and undesirable fuel economy. Some days without answers, so here is what i am thinking, please notê i am not bmw specialist. So I replaced the spark plugs and this helped for a few months and then recently the issue cropped again so I replaced the ignition coil and this helped marginally, the sputtering isn't as bad but there's still a lack of power and good normal acceleration. sparkplugs. The first step in changing your spark plugs is to remove the old ones. To avoid turning this job into an all-weekend project, remove one spark plug at a time, inspect it, clean it, and — if it’s salvageable — gap the spark plugs.Then replace it before you move on to the next spark plug in cylinder sequence order. But if you really want to fix your misfire, gather a bit more information first. After changing the spark plugs in my 300SL I am getting this strong odor while inside the car, really strong when idling. If you are losing coolant look for leaks external of the engine, white smoke for head gasket, and or coolant in the oil or oil in the coolant etc. No lights come up in dash, runs great but after driving I … (Not 350mi+ like my e39). I wonder too about spark plug wires as posted below, and wish to caution anyone doing their own plugs to know that spark plug wires need to be handled with care, no extreme bending or pulling on the wire to get it off the plug etc. My car is a 2007 Mazda CX-7, 2.3 L 4-cylinder, FWD with a factory turbo charged engine and 155 000 miles on it. However, after talking to a friend who races subaru rally cars, who seems to be a Subaru expert, he says don't do it, because the engine lights will come on and it will require a trip to the dealer to reset the computer in the Forester. Like many automotive components, spark plugs don't last forever. compression check may give you a clue to which piston is problem. 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