revs go up and down when in park

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pixielee - 26 Jan 2007 22:16 GMT

i have a 93 honda prelude auto and when it is in park the revs go up and
down does anyone know why it would do this. it doesnt happen with
anything else.

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MishaA - 26 Jan 2007 22:46 GMT

could be fast idle valve, could be eacv, could be lack of coolant, and
could be your tranny...

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MishaA

http://www.automotiveforums.com

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Elmo P. Shagnasty - 26 Jan 2007 22:56 GMT

In article
<81e460134d4d17d5ae29b7109927a53e@localhost.talkaboutautos.com>,

> i have a 93 honda prelude auto and when it is in park the revs go up and
> down does anyone know why it would do this. it doesnt happen with
> anything else.

This happened on my 02 Odyssey; the idle air control valve went bad.

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jim beam - 27 Jan 2007 02:21 GMT

> i have a 93 honda prelude auto and when it is in park the revs go up and
> down does anyone know why it would do this. it doesnt happen with
> anything else.

check coolant level inside radiator is full to the top and that all air
is purged from the system.

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chicago - 28 Jan 2007 01:25 GMT

I had that happening to me on neutral during cold weather, I was told by a
trustable mechanic it was not a big deal and I never did anything about it,
still running great, although I didnT face extreme cold really lately.

>i have a 93 honda prelude auto and when it is in park the revs go up and
> down does anyone know why it would do this. it doesnt happen with
> anything else.

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