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    deathviaangel's Avatar
    deathviaangel Posts: 1, Reputation: 1
    New Member
    		  
    #1

    May 4, 2009, 08:44 PM
    2001 Honda Civic EX Rough Idle
    Now I know a lot of you guys have seen this before I mean it's a Honda.
    Well this Honda is my baby so..

    CEL Code: P0505
    The car has a rough idle, that keeps bouncing up and down.

    Things I have done and replaced.
    Took off the Throttle body and cleaned it with carb cleaner, replaced the idle air control valve, replaced the pcv valve, replaced the map sensor, replaced the oxygen sensor. Checked for all possible vacuum leaks, and even flushed the radiator. I am really out of ideas on this one guys. I have used so much time and money, I need to get it smogged and go to work. :confused::confused::confused:
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
    Uber Member
    		  
    #2

    May 5, 2009, 07:26 AM

    . Check/replace Engine Coolant Temperature (ECT) Sensor, not the ECT Switch or the ECT Gauge.

    . Check/replace the Throttle Position (TP) Sensor.

    . Ensure throttle plate is adjusted properly.
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