Honda Car Forum

problem seems like a bad IAC valve - When I start it, it runs at 2000 for 10 sec then starts varying between 1000 & 2000 rpm at idle. Over 2400 it is level. If I pull the connector it will vary quickly around 1500 rpm as soon as it is started. Cold or hot no difference. 10 sec delay will happen every time it is started.I just replaced the air cleaner and cleaned the PCV valve, which seems to work about the same as a new one, then this started. Coincidence or something else wrong - like an air leak? How can I be sure it is the IAC??I've pulled the air intake and plugged the bottom throttle port and it goes to idle. the only trouble code is 0505 unless of course I pull the connector. Pulling the throttle position sensor plug yields a constant 2000 rpm and an code indicating it is open.thanks.

iac valve common to fail on odysee also has problem with the wires to the power steering pressure switch pulling out of the connector causing idle to fluctuate lightly pull on wires to check for bad connection switch is in the power steering pressure line pass. side of car on back side of engine

yup sounds like the iac valve,or quite possible that your low on coolant,it requires coolant as a media to transmit signal to ecu,coolant also runs through the valve,check coolant first,they tend to leak at the bypass gasket between cyl head,the housing behind where egr mounts,good luck