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

    Mar 6, 2010, 01:56 PM
    Honda engine idle goes up & down whenwarm
    Honda engine idle goes up (2000 RPM) & down (1200 RPM) when warm (6 cyl 98 accord)
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
    Uber Member
    		  
    #2

    Mar 6, 2010, 03:21 PM

    . Clean or replace the Idle Air Control Valve (IACV):

    https://www.askmehelpdesk.com/cars-t...ml#post1054149

    . Clean the throttle plate and throttle body. Afterwards, clean the air box and replace the air filter.

    . Replace the PCV Valve.

    If the problem persists, focus on the Ignition Control Module--it may need replacing. These links will provide the necessary background, perspective, and how-to:

    https://www.askmehelpdesk.com/cars-t...tml#post260436

    https://www.askmehelpdesk.com/cars-t...tml#post265896
    biff26's Avatar
    biff26 Posts: 28, Reputation: 4
    New Member
    		  
    #3

    Mar 7, 2010, 08:28 AM

    Check fast idle valve sometimes they stick open
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