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Honda Civic FD1 - R18A Throttle Body cleaning after ~ 50,000Km. Symptoms: Vibration when the A/C is cycling ON What happened: There was a very little amount of carbon build up on the throttle body and the RPM was dropped by ~200 due to the reduced gap between the throttle body and the plate. It was enough to make the vibration when the A/C compressor is adding some load to the engine. It got recovered within a second; however I felt that so badly LOL * Need to remove the air box completely ** Don't force open the throttle plate (It will damage the throttle body, strip gears and mess your idling) *** To open the throttle plate for cleaning, turn the ignition ON and ask some one to press the accelerator or use a weight. **** Use throttle body cleaner, contact cleaner or carb cleaner. ***** Don't forget to hook the MAF sensor before turn on the ignition otherwise it will log 2 errors (you can clear them if you have a scanner). ****** This method is without disconnecting the battery. No need to re learn the idle after cleaning. Before: After: Cleaned everything and also cleaned the engine + transmission because it's hard to reach this area after assembling the air box Vibration during A/C cycling ON has disappeared and the RPM is stable at ~800 P, N + A/C ON D, R + A/C ON