On May 5, 10:47*am, Bendit <BenLamour...@yahoo.com> wrote:
> On May 4, 10:24*pm, jim beam <spamvor...@bad.example.net> wrote:
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> > Bendit wrote:
> > > Hello all. I need opinions. Car is a1994preludeVTEC.
>
> > > On cold starts,idleclimbs to 2 to 2.5K RPM. All is well it seems.
>
> > > Then after a while, when the engine starts to warm up, the RPM will go
> > > down, then up, down then up (you get the picture).
>
> > > When the car is fully warmed up, RPM stays at the same place normally.
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> > > Opinions?
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> > > Thanks!
>
> > > Ben
>
> > check coolant level inside radiator. *must be full to the top. *if
> > diluting antifreeze, use distilled water.- Hide quoted text -
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> > - Show quoted text -
>
> Thanks for your reply!
>
> I did check the coolant level IN the radiator. Full to the top, 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 fast idle valve 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- Hide quoted text -
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> - Show quoted text -

yeah, my guess too. don't know preludes, but the civic uses a small
idle air valve that gets opened and closed to regulate idle speed (as
opposed to other cars which have a little motor to open and close
things) which gets gunked up, and might benefit from attention/
replacement.