Question about 1989 Honda Prelude

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1989 honda prelude enigne idles high then low irratic

The car runs rough and idles high then low runs rough when first started then it starts the high and low idle

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  • cowboy5717 Oct 28, 2008

    well I guess I should have said I know it is not a intake leak as I have tested it but thanks and good point always try easy first is thier an idle control circut on this thing? maybe and how do you test it i f that could even be the problem

  • cowboy5717 Oct 28, 2008

    wellI sprayed starting fluid around the rail and anywhere I could I aint sure about foriegn cars notmuch experiance but an engine is an engine correct?

  • cowboy5717 Oct 28, 2008

    and did I mention that it only does it when it is first started and cold outside . anyother time it does not do it when it. warms up after a long drive it is ok and runs fine .

  • otibs Jan 12, 2009

    yes i had the same problem on my car. when frist start the idling is too hing. and when its getting hot {in normal operating temp} the idling strat to playing up, idling is suddenly hing and then low.

  • Anonymous Mar 15, 2014

    Car was low on fuel when this problem occured

  • Anonymous Mar 22, 2014

    Honda Odyssey sat for one year idling rough now what can I do?

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I had the same problem on a Rover. There was a leak in inlet manifold that was caussing the problem.
To verify, spray some sealant to temporarily seal the inlet manifold .and the eratic idling should disappear for some time.
If it does, you know there is leak in inlet manifold which you can take of and refit with a new gasket.

Posted on Oct 27, 2008

  • myad51 Oct 28, 2008

    I don't think there is a circuit for idle control. The idle speed is controlled by the ECU (computer) via Idle air control valve.

    IdleAir control valve could be leaking air. You can try adjusting If that does not fix it, you can try replacing the IACV. (Idle air control Valve).

    Btw how did you check for inlet leak?

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