On May 13, 12:12*pm, z <gzuck...@snail-mail.net> wrote:
> On May 5, 10:47*am, Bendit <BenLamour...@yahoo.com> wrote:
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> > On May 4, 10:24*pm, jim beam <spamvor...@bad.example.net> wrote:
>
> > > 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.
>
> > > > Opinions?
>
> > > > 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 -
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> > 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 -
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> 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.- Hide quoted text -
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> - Show quoted text -

Problem solved. I have replaced both temperature sensors and now all
is well.