I have a 2000 honda civic LX and yesterday i noticed my car was idling at
about 200rpms when normal idle is about 900rpms.when cold it idles ate
1100rpms then goes down to 200 when it's warm, i also noticed when the
fans kick in the rpms go up to about 600rpms then drops back down.i have a
haynes manual and it suggests the IAC valve, is there anything else that
could cause this.

 

00civic wrote:
> I have a 2000 honda civic LX and yesterday i noticed my car was idling at
> about 200rpms when normal idle is about 900rpms.when cold it idles ate
> 1100rpms then goes down to 200 when it's warm, i also noticed when the
> fans kick in the rpms go up to about 600rpms then drops back down.i have a
> haynes manual and it suggests the IAC valve, is there anything else that
> could cause this.
>
the gauge only goes down to 500rpm, so it's unlikely you tell if the
motor's idling at 200. normal is supposed to be 750.

 

jim beam <nospam@example.net> wrote in
news:SZydnfSTOcwJ3YPeRVn-sQ@speakeasy.net:

> 00civic wrote:
>> I have a 2000 honda civic LX and yesterday i noticed my car was
>> idling at about 200rpms when normal idle is about 900rpms.when cold
>> it idles ate 1100rpms then goes down to 200 when it's warm, i also
>> noticed when the fans kick in the rpms go up to about 600rpms then
>> drops back down.i have a haynes manual and it suggests the IAC valve,
>> is there anything else that could cause this.
>>
> the gauge only goes down to 500rpm, so it's unlikely you tell if the
> motor's idling at 200. normal is supposed to be 750.
>
>


I'll bet he's actually idling at 650.

1) Dirty throttle body
2) Dirty/defective IAC.
3) Idle speed screw adjusted incorectly.

--
TeGGeR®

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/

 

TeGGeR® wrote:
> jim beam <nospam@example.net> wrote in
> news:SZydnfSTOcwJ3YPeRVn-sQ@speakeasy.net:
>
>
>>00civic wrote:
>>
>>>I have a 2000 honda civic LX and yesterday i noticed my car was
>>>idling at about 200rpms when normal idle is about 900rpms.when cold
>>>it idles ate 1100rpms then goes down to 200 when it's warm, i also
>>>noticed when the fans kick in the rpms go up to about 600rpms then
>>>drops back down.i have a haynes manual and it suggests the IAC valve,
>>>is there anything else that could cause this.
>>>
>>
>>the gauge only goes down to 500rpm, so it's unlikely you tell if the
>>motor's idling at 200. normal is supposed to be 750.
>>
>>
>
>
>
> I'll bet he's actually idling at 650.
>
> 1) Dirty throttle body
> 2) Dirty/defective IAC.
> 3) Idle speed screw adjusted incorectly.
>
i'm always reluctant to recommend adjusting the idle screw because if
all the other stuff is working right, you never need to go near it.