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P0401 and P0420 CEL codes: 2001 Accord

Old Jun 24, 2011 | 07:40 PM
  #11  
capthoward's Avatar
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I took the intake cover off again and cleaned up/out the IAC valve. Put everything back and still had the surge. I tapped on the top of the throttle assembly and the surge went to a very, very quick surge. I drove the car around the neighborhood and it is performing marvelously now. No CEL yet and the engine even sounds better/smoother. Thanks for all the input, you saved me alot. Besides, I love sticking it to the man!
 
Old Jun 24, 2011 | 07:55 PM
  #12  
PAhonda's Avatar
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From: Houston, TX
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Hopefully it is fixed and that surge doesn't return. Thanks for the update.
 
Old Jun 25, 2011 | 07:25 AM
  #13  
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Posts: 525
From: MA
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My car did that before, i unplugged the MAP sensor on top of the throttle body the surging went away, i plugged it back in the idle surging again, but i tap the sensor a lightly couple times the idle smooth itself out. Cleared the code and the idle smooth since then.
 
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