In article <BBlKf.3594$UN.1604@newsread2.news.pas.earthlink.n et>,
"Elle" <honda.lioness@nospam.earthlink.net> wrote:

> The fact that this occurs after warmup (along with the sluggish, stuttering
> performance) suggests the oxygen sensor may be near or is at complete
> failure.
>
> Most inexpensive source of OEM oxygen sensors I've found:
> https://www.automedicsupply.com/
>
> The grinding sound, though, suggests other possibilities as well.
>
> www.autozone.com has a free online manual for your Prelude, for your
> reference.

I've gotten the grinding and buzzing noises on slow O2 sensors. It's
unburnt air and fuel going through the catalytic converter. I'm sure
it's very bad for honeycomb cats.


>
> "Scythemk" <mikulevi@gmail.com> wrote
> > Hi everyone,
> > I have a 1993 Honda Prelude VTEC. I recently started having this
> > problem where the engine pulls fairly well all the way up to, oh about
> > 2200 rpm, and then it almost feels like a brake is being applied in the
> > engine, the needle moves sluggishly and doesn't want to respond quickly
> > to gas inputs. This lasts to about 3000-3500rpm and then it feels as if
> > the engine lets loose again and the needle goes fine all the way to
> > redline. In all these other rpms the engine feels fairly poised and
> > smooth. However at 2.2 -3.5 k its just sluggish and sometimes the car
> > even jerks a little under constant throttle and in gear. There is also
> > a subdued grinding sound seemingly coming from under the car right
> > under the gas pedal and an ugly note in the exhaust. This doesnt always
> > happen but has been hapening more and more recently. My clutch was just
> > recently replaced. I also noticed it does not do this when the engine
> > is cold, say in the morning after leaving it over night. However once
> > it gets up to operating temperature it starts doing it. One of my
> > friends has suggested it might be the catalytic converter, as during a
> > recent smog test i barely passed in the HC(hydrocarbon) category. Any
> > insight, please?
> >