Re: 2003 Accord Throttle Surging Problem/P0505

penthor_mul@[EMAIL PROTECTED]
 wrote:
> On Apr 5, 5:58 pm, penthor_...@[EMAIL PROTECTED]
 wrote:
>> On Apr 5, 3:20 pm, "Elmo P. Shagnasty" <el...@[EMAIL PROTECTED]
> wrote:
>>
>>
>>
>>> In article
>>> <55e2e307-92a9-4d42-9c47-3951efc2a...@[EMAIL PROTECTED]
>,
>>>  penthor_...@[EMAIL PROTECTED]
 wrote:
>>>> My 2003 Accord is experiencing a throttle surge problem similar to
>>>> what I have read about in this ng.  6 cyl.  No other apparent
>>>> problems.  120K on plugs.  27mpg.
>>>> It warms up OK.  Then it begins surging between 1000rpms to 2000rpms.
>>>> Up and down continuously surging.  It happens when it's sitting still
>>>> or when being driven.  Cruise on or off doesn't make a difference.
>>>> Using an Actron code reader I get a "pending"  P0505 (Idle Control
>>>> System Malfunction) which seems reasonable.  I don't know where to
>>>> start to address this problem.  Any advice would be greatly
>>>> appreciated.
>>>> Penthor
>>> Idle air control valve?
>> That's where I am now.  I read on another site that the IAC valve
>> controls the idle before the engine warms up, and the MAP sensor
>> controls the idle before the engine warms up.  I tried to remove the
>> IAC valve to clean it as I read elsewhere.  The 2 screws are very soft
>> metal and I'm afraid of stripping them out.  So I'm planning on
>> removing the throttle body to better access them.
> 
> Actually, the MAP sensor controls idle after warm up.


no it doesn't - that source is wrong.  the iacv controls idle - idle air 
control.  the map sensor is part of the input the computer uses to 
compute idle values, but it doesn't control the idle system in any other 
way.

if you're getting the iacv code, you need to test it per the honda 
manual.  helminc.com.