Which model number plug did you get. Did you change them when the engine was cold? Did you torque them down properly? Did you make sure the plug wires were making good contact? Did any contaminets get in? Did you gap the plugs correctly? Maybe one plug was bad?nakees said:Today I changed my almost new Bosch Platinum+4 spark plugs with "New" NGK Platinum Laser. After that I felt that the engine has lost some power. I can feel the change in acceration. First thing I have to do next weekend is to change back to Bosch Platinum+4.
nakees said:I changed the plugs 20min after stoping the engine. What is the different between changing the the plugs when engine is cold and when it is hot. I used NGK Laser platinum (PFR5B-11). BTW I didn't check the
gaps. I assumed that new plugs will have the right gap.