Re: Weird Idle when cold (1994 prelude VTEC)

On 5/5/08 8:27 PM, in article
0e5dce1a-7d3f-4af2-87dc-6fc55a301a80@[EMAIL PROTECTED]
 "Bendit"
<BenLamoureux@[EMAIL PROTECTED]
> wrote:

> On May 5, 10:01 am, motsco_ <mots...@[EMAIL PROTECTED]
> wrote:
>> Bendit wrote:
>> 
>>   . . . . . . .but> the expansion tank was empty. So I added some in
there.
>> 
>>> My "instincts" tell me that the RPM "dance" is not related to the
>>> radiator. Perhaps something about fastidlevalve when cold or
>>> something? (I don't know much about cars, more motorcycles). It seems
>>> the car cannot transition well between cold and warm status. Know what
>>> I mean?
>> 
>>> Cheers and thanks again for any information!!!!!
>> 
>>> Ben
>> 
>> =========================
>> 
>> Expansion tank has to be kept at MAX so there's a RESERVE to replace
the
>> AIR that's going to burp out next time the engine warms up.. Computer
>> gets confused if the sensors aren't immersed,idlegoes up and down.
>> Been covered a million times.
>> 
>> 'Curly'
> 
> 
> Thanks for the information. Filling the expansion tank did not fix my
> problem (even though it needed to be done).
> 
> Any other ideas?
> 
> (keep in mind idle maintains itself just fine once the car has reached
> operating temperature)
> 
> Thanks again!

If the expansion tank was empty, did you also fill the radiator itself
(which most likely is also low)?  The problem you are trying to fix is to
get rid of the air bubble in the cooling system that is isolating the
temperature sensors and making the engine computer think the temp of the
engine is something other than what it actually is.