odyssey engine revving while in park

HONDA ODYSSEY
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MRS G
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2002 honda odyssey, 90,000 miles, engine: water cooled 4 stroke SOHC VTEC 6cylinder gasoline ingine.

was driving with AC on, stopped and put van in park, it immediately began revving and then idling normally, back and forth as though i was stepping on the gas for about 3 seconds and then off for 3 seconds. i put it back in drive and drove a few feet, put it back in park and it did the same thing. then i drove about 1 minute and then put it in park a 3rd time and it idled like normal (no revving). i haven't started it since. what does that sound like?? THANK YOU!!!!
Jun 16, 2007 at 8:09 PM
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BRUCE HUNT
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I would venture that the car will idle normal when there is no A/C on. Try that. You are having some sort of vacuum leak, at least I believe that to be true and at least as a starting point. Look at vacuum hoses on the vehicle and listen for any sound as from a leaking hose. With the A/C on the car needs to adjust the idle speed to compensate for the extra pull of the compressor. It is not getting a clear picture of what is needed for fuel air mixture to run and is overcompensating.
Jun 17, 2007 at 8:47 PM